Abstract: In general, the present invention includes a catalytic converter including a substrate having a trimetal catalyst system thereon. The trimetal catalyst system includes a double coat system in which Pt and Rh are together on one layer and Pd is separate on a second layer. The invention also includes three discoveries. (1) It has been found that there is a conversion efficiency improvement when Pt and Rh are on the outer layer of a dual layer system while Pd is on the inner layer. (2) It has been found that there is a conversion efficiency improvement when the masses of the two layers are in a mass ratio of about 3:1 to about 1.25:l and preferably 2:1. That is, the inner layer contains twice the washcoat mass as the outer layer. (3) It has been found that the dual coat system can be produced using one calcining step.

Abstract: A first honeycomb structure not bonded with brazing filler metal and having a catalyst-carrying layer, and two second honeycomb structures bonded together with brazing filler metal and without applying a catalyst-carrying layer arranged before and after the first honeycomb structure are aligned coaxially inside a cylindrical casing. The first honeycomb structure preferably has a greater concentration of air passages than the second honeycomb structures and moreover, is spaced a fixed distance from each of the second honeycomb structures.

Abstract: The invention relates to a sorption catalytic converter for the combined chemo-sorptive and oxidative cleaning of diesel engine exhaust gases with a high blocking activity for highly volatile organic exhaust gas components, compounds sorbed on particles, moderately and scarcely volatile organic compounds (SOF), materials with a pungent odor, irritating materials, and ammonia, using an upstream NO.sub.x reducing catalytic converter, with measurable blocking activity for minute high carbon particles, with a high oxidation activity for CO and a restricted oxidation activity for NO and SO.sub.2 with a working range from the ambient temperature to 650.degree. C., comprising a monolithic honeycomb structure having channels adapted for free flow of diesel exhaust gas therethrough of the active mass or of inert carrier material, coated with the active mass, the active mass preferably being composed of V.sub.2 O.sub.5 /WO.sub.3 /MoO.sub.

Abstract: The present invention relates to a thermal barrier coating applied to the inside surface of a catalytic converter and intake pipe between the manifold of an internal combustion engine and the catalytic converter. The catalytic converter and intake pipes are generally formed in two halves to facilitate an effective means by which the thermal barrier coating can be sprayed onto the inside surface by an arc plasma source prior to combining the individual halves of the catalytic converter or intake pipe.

Abstract: A catalytic converter with electric heating includes a housing and at least one honeycomb body being disposed in the housing for conducting a flow of exhaust gas of an internal combustion engine through the honeycomb body in a given flow direction. The honeycomb body is electrically conductive at least in partial regions upon being heated by an electric current and it has a catalytically active coating at least in partial regions. The honeycomb body has at least two electrically heatable partial regions being disposed in succession as seen in the given flow direction. The electrically heatable partial regions have a different axial length and/or a different electrical resistance. The honeycomb body also has at least one other partial region being at least substantially blocked to the electric current and separating the electrically heatable partial regions from one another.

Abstract: A method for controlling emissions of a fossil fuel fired boiler including a high temperature fabric filter house with an SCR catalyst situated therein for receiving flue gases along with an injected ammoniacal compound and sorbent. The sorbent reacts with the SO.sub.x while the ammoniacal compound reduces the NO.sub.x in the presence of the SCR catalyst inside the high temperature fabric filter house. Both the SO.sub.x and the particulates are removed upstream of the SCR catalyst to diminish the problems of SO.sub.2 or SO.sub.3 poisoning of the catalyst and erosion and fouling of the catalyst with the fly ash. Since the sulfur oxides and particulates are removed prior to the heat recovery system, the fouling and corrosion potential are substantially decreased thus allowing the heat recovery system to be operated at a lower outlet flue gas temperature which yields an incremental improvement in energy recovery.

Abstract: A device for the treatment of exhaust gases such as a catalytic converter, a diesel particulate trap and the like, includes a housing having an inlet at one end and an outlet at its opposite end through which exhaust gases flow; a structure resiliently mounted within the housing, the structure having an outer surface and an inlet end surface at one end in communication with the inlet of the housing and an outlet end surface at an opposite end in communication with the outlet of the housing; and mounting means, disposed between the structure and the housing, for selectively exerting substantially stable mounting pressure against the housing and the structure over a temperature range of from about 20.degree. C. to at least about 1200.degree. C., wherein the mounting means is a flexible mounting mat including an integral, substantially non-expanding sheet comprising ceramic fibers, wherein the fibers are substantially shot free. The mat has flexible, structural integrity.

Abstract: A modular catalytic converter and muffler is used to purify exhaust from a relatively large diesel engine. The device includes various structural components that are mounted in the exhaust flow path within a housing having an inlet and an outlet. A plate mounted within the housing divides the housing into an inlet chamber and an outlet chamber. A plurality of catalytic converter sub-cans are mounted across the plate between the inlet chamber and the outlet chamber. A flow distributor is mounted within the housing upstream of the catalytic converter sub-cans. The flow distributor divides and directs a portion of the exhaust to each of the catalytic converter sub-cans. Some muffler structure is mounted within the housing between the catalytic converter sub-cans and the outlet in order to attenuate noise in the exhaust.

Abstract: A catalytic converter selectively controllable between a radial flow mode, wherein exhaust gas is caused to radially flow across the catalyst thereof, and a by-pass mode, wherein exhaust gas passes axially therethrough. The catalytic converter includes a selectively perforated tube, a catalytic monolith composed of a series of alternating herringbone corrugation patterned foil sheets having a noble (precious) metal catalytic material applied to the surface thereof wherein each of the foil sheets has a central hole whereat is situated the tube, a valve for selectively occluding the tube, and a clam-shell enclosure. The herringbone corrugation pattern provides a plurality of radial passageways. When the valve is in its closed position the tube is in a closed state, wherein the exhaust gas entering the tube upstream of the catalytic monolith is caused to pass through the passageways until emerging at the outer periphery of the catalytic monolith.

Abstract: The electrically heated catalytic converter of the present invention includes a catalyst substrate, which is formed as a scroll-like cylindrical laminated assembly. The assembly is formed by laminating a thin corrugated and plain metal sheets and winding the metal sheets together around a center electrode. The outermost layer of the laminated assembly is connected to an outer electrode. The corrugated metal sheet has an insulating coating made of an alumina, and the plain metal sheet is uninsulated. Local conductive connections form between the thin metal sheets by soldering strips of zirconium solder foils between the layers of the thin metal sheets. Since zirconium has a larger reducing capability than aluminum, the alumina in the insulating coating is reduced by zirconium and precipitates at the local conductive connections. Therefore, the plain and corrugated metal sheet are electrically connected to each other at the local conductive connections.

Abstract: There is provided a novel terminal bus and retainer for a multicellular converter, particularly a catalytic converter, which converter is characterized by an electrically heatable portion and a light-off portion. The electrically heatable portion includes flat thin metal strips as heater bands and flat thin metal bands not electrically heatable. A terminal bus and retainer is adapted to be connected to a voltage source and to the ends of the heater bands. A portion of the terminal bus and retainer may be used as a connector bus. The terminal bus and retainer also retains the thin metal foil elements in tightly spirally wound condition. These devices are especially useful in catalytic converters for automotive vehicles.

Abstract: Method of forming a catalytic bonding layer by chemical vapor deposition (CVD) onto carrier structures including internal combustion engine exhaust system and catalytic converter components, in order to bond a catalyst layer thereto, thereby providing a structure wherein additionally the bonding layer can be energized to promote catalytic conversion-activating preheating of the catalyst. In an electromagnetic induction catalytic preheating system, a ceramic lattice or a metallic network can form the base structure of the catalytic converter, wherein at least the latter is encompassed by an electrical/thermal insulating layer; around either induction coiling is wrapped and secured by a thermally insulating material. Upon engine start, current is electromagnetically induced in the catalytic bonding layer or the metallic network through the induction coiling.

Abstract: A process and apparatus for accelerating the rate of heating of a fixed bed catalyst to a light-off temperature for a catalytic reaction is disclosed. Supplementary energy from an external energy source is provided to a predetermined area of the catalyst bed for a limited period of time. The fixed bed catalyst may be present as a solid body or in bulk form and has a gas inlet area defined by a cross-section of the flow through channels of the reaction media. The supplementary energy is supplied to one or more isolated sections of the gas inlet area of the catalyst. Such a system significantly reduces the energy required in order to effectuate at least partial conversion of harmful emissions during initial operation of the converter.

Abstract: A flat-corrugated combined sheet 16 is obtained from a flat sheet 10 and corrugated sheets 12 and 14 which are welded together. The combined sheet 16 is rolled, so that a catalyst carrier 18 of a honeycomb structure to which an exhaust gas is contacted is obtained. At a middle part of the catalyst carrier 18, the flat sheet 10 has a section 10-1 free of corrugated sheet, and is formed with louvers 21, so that, in the rolled state, a turbulence generating section 30 is created. At a location upstream from the turbulence generating section 30, the flat sheet 10 has spaced sections 10-2 free of corrugated sheet, so that, in the rolled state, low flow-resistance sections 22 are created. The dissipation of heat of the exhaust gas is reduced at the sections 22, so that the temperature of the exhaust gas introduced into the turbulence generating section 30 at locations downstream from the low flow-resistance sections 22 is high, thereby promoting an activation of the catalyst at the section 30.

Abstract: A method and apparatus for controlling emissions of a fossil fuel fired boiler including a high temperature fabric filter house with an SCR catalyst situated therein for receiving flue gases along with an injected ammoniacal compound and sorbent. The sorbent reacts with the SO.sub.x while the ammoniacal compound reduces the NO.sub.x in the presence of the SCR catalyst inside the high temperature fabric filter house. Both the SO.sub.x and the particulates are removed upstream of the SCR catalyst to diminish the problems of SO.sub.2 or SO.sub.3 poisoning of the catalyst and erosion and fouling of the catalyst with the fly ash. Since the sulfur oxides and particulates are removed prior to the heat recovery system, the fouling and corrosion potential are substantially decreased thus allowing the heat recovery system to be operated at a lower outlet flue gas temperature which yields an incremental improvement in energy recovery.

Abstract: An exhaust gas catalytic converter, particularly for an internal combustion engine, includes a flow channel for carrying exhaust gas. A carrier body is disposed in the flow channel and has a structure through which exhaust gas can flow. The carrier body is formed of sheet-metal layers. At least some of the sheet-metal layers are at least partially structured. A catalytic coating is disposed in the carrier body. At least one separate heating element in addition to the structure, is adapted to the shape of one of the at least partially structured sheet-metal layers, is electrically insulated from the structure and is in close thermal contact with at least one of the coating and the sheet-metal layers, for electrically heating the carrier body externally. A method for producing an exhaust gas catalytic converter includes placing spaced-apart heating elements adapted to a shape of a corrosion-proof structured sheet-metal layer into the structured sheet-metal layer.

Abstract: A catalyst device is used for a combustion apparatus. The catalyst device is provided with multiple gas flow channels. The gas flow channels are formed by corrugated sheets and flat sheets which are alternatively laminated. One of the sheets is a paper sheet mainly composed of inorganic heat-resistant fibers carrying catalyst metal dispersed thereon, and the other sheet is provided with a thin metal plate. Therefore, the combustion apparatus provided with the catalyst device has a shortened preheating time, produces a reaction heat which is uniform over all the catalyst layers and maintains the stabilized performance for a long time.

Abstract: An exhaust gas converter arrangement includes a common catalyst support with a precatalyst section and a main catalyst section of larger size downstream in the direction of exhaust flow. The common support is made of alternate corrugated and flat sheet metal members wound into cylindrical shape. Between the precatalyst section and the main catalyst section, the support has an intermediate region in which the sheet metal members are formed with apertures to minimize heat conduction between the catalyst sections.

Abstract: A catalytic converter exhaust section comprises a first mounting plate, a second mounting plate, a hollow cylindrically shaped metallic tube and a plurality of substantially identical metallic catalytic converter substrates arranged in a honeycomb pattern. Each of the catalytic converter substrates has a regular hexagonal cross section and an inlet end separated from an outlet end by six planer walls. The metallic substrates are attached in parallel to form a compound honeycomb cross section with an inlet side, an outlet side, and an outer border defined by a portion of the planer walls. The compound honeycomb cross section is affixed within the tube between the first mounting plate and the second mounting plate. The individual substrates are coated with an appropriate catalyst for treatment of a particular exhaust component.

Abstract: A method and apparatus for controlling emissions of a fossil fuel fired boiler including a high temperature fabric filter house with an SCR catalyst situated therein for receiving flue gases along with an injected ammoniacal compound and sorbent. The sorbent reacts with the SO.sub.x while the ammoniacal compound reduces the NO.sub.x in the presence of the SCR catalyst inside the high temperature fabric filter house. Both the SO.sub.x and the particulates are removed upstream of the SCR catalyst to diminish the problems of SO.sub.2 or SO.sub.3 poisoning of the catalyst and erosion and fouling of the catalyst with the fly ash. Since the sulfur oxides and particulates are removed prior to the heat recovery system, the fouling and corrosion potential are substantially decreased thus allowing the heat recovery system to be operated at a lower outlet flue gas temperature which yields an incremental improvement in energy recovery.

Abstract: An adsorbent-catalyst for exhaust gas purification, has a honeycomb structure having a large number of passages divided by partition walls, substantially parallel to the flow direction of an exhaust gas to be purified, an adsorbent layer having a hydrocarbon adsorbability, supported on the honeycomb structure, and a catalyst layer having a three-way catalytic activity or an oxidizing ability, supported on the honeycomb structure, in which adsorbent-catalyst the adsorbent layer and the catalyst layer are separately supported on the honeycomb structure in all or part of the cross sections of the adsorbent-catalyst perpendicular to the flow direction of the exhaust gas.

Abstract: The catalytic converter has an axis and a housing having an inlet and an outlet. The housing contains hollow cylindrical catalyst means having an inner surface, an outer surface and passages for the exhaust gas which run from the inner surface to the outer surface. In a cross-section at right angles to the axis, the catalyst means surround an inner space of the catalyst means, with which space the inlet communicates and which space contains a limiting and/or guide member. This has a limiting and/or guide surface which approaches the inner surface of the catalyst means in a direction away from the inlet and distributes the exhaust gas, flowing into the inner space of the catalyst means during operation, uniformly over the passages of the catalyst means.

Abstract: A metal honeycomb body includes at least two disks being mutually spaced apart and disposed one after the other relative to an axis. Each of the disks has a multiplicity of channels formed therein through which a fluid can flow along the axis. At least one support connects the disks to one another in the vicinity of the axis. The at least one support is tubular, bar-shaped or rod shaped.

Abstract: This invention is an improved catalyst structure and its use in highly exothermic processes like catalytic combustion. This improved catalyst structure employs integral heat exchange in an array of longitudinally disposed adjacent reaction passage-ways or channels, which are either catalyst-coated or catalyst-free, wherein the configuration of the catalyst-coated channels differs from the non-catalyst channels such that, when applied in exothermic reaction processes, such as catalytic combustion, the desired reaction is promoted in the catalytic channels and substantially limited in the non-catalyst channels. The invention further comprises an improved reaction system and process for combustion of a fuel wherein catalytic combustion using a catalyst structure employing integral heat exchange, preferably the improved structures of the invention, affords a partially-combusted, gaseous product which is passed to a homogeneous combustion zone where complete combustion is promoted by means of a flameholder.

Abstract: A honeycomb structure having a periphery and two ends, including a plurality of passages which are defined by partition walls and extend in an axial direction between the ends, wherein the partition walls are formed of a plurality of through holes for forming turbulent flow so that the fluid pass through the through holes from one of the passages to the adjacent passage, each of the through holes having an open area of at least 0.25 mm.sup.2, thereby a stream of the fluid passing through the honeycomb structure is efficiently mixed to increase its contact with a catalyst composition coated on a surface of the partition walls. The honeycomb structure may have a corrugated thin metal foil. Alternatively, the honeycomb structure may have a unitary structure formed by sintering an extruded body comprising a powder material.

Abstract: This invention is an improved catalyst structure and its use in highly exothermic processes like catalytic combustion. This improved catalyst structure employs integral heat exchange in an array of longitudinally disposed, adjacent reaction passage-ways or channels, which are either catalyst-coated or catalyst-free, wherein the configuration of the catalyst-coated channels differs from the non-catalyst channels such that, when applied in exothermic reaction processes, such as catalytic combustion, the desired reaction is promoted in the catalytic channels and substantially limited in the non-catalyst channels.

Abstract: There is provided an improved converter body core element having a corrugated thin metal strip having, parallel to and close to a longitudinal marginal edge thereof, a recess dimensioned and configured to receive a heater band. In specific embodiments, the heater band is desirably lightly corrugated, i.e., having an amplitude of the corrugations which is from one tenth to one third the amplitude of the corrugations in the strip containing the recess, and the heater band is dimensioned and configured to fit into the recess.

Abstract: There is provided a start-up catalyzer for catalyzing exhaust gas from an internal combustion engine in which flat and corrugated sheets are disposed in alternating relation. Some of the flat sheets have an electrically conductive resistance-heating layer which may be catalytically active and in form of a plurality of rosette-shaped conductive loops connected in series.

Abstract: A catalytic combustion apparatus has a cylindrical housing defining a fluid passage, and a plurality of combustion catalyst bodies arranged face to face along the fluid passage in the cylindrical housing. The catalyst bodies are loosely fired in the cylindrical housing. Each catalyst body defines numerous bores extending along the fluid passage. The cylindrical housing includes holders extending inwardly of the housing for contacting end surfaces of the catalyst bodies to prevent movement thereof along the fluid passage.

Abstract: A metal honeycomb heater is protectively mounted in an axially assembled enclosure comprising opposing tubular enclosure sections incorporating internal bore stops and a resilient mounting material to support the heater. An axial force of predetermined magnitude is applied to the sections during assembly, preloading the resilient mounting material and generating a selected spring tension and preloading force on the honeycomb. The sections are fastened together under this force so that the preloading force and spring tension are retained during subsequent use of the assembly.

Abstract: A catalytic process and apparatus which is mechanically manipulated to increase the operating efficiency thereof. Provision is made for the application of an electric current during mechanical manipulation of the catalyst such as may be useful in certain instances.

Abstract: An electrically heated catalytic converter having a substrate for a catalyst which is formed as a scroll-like cylindrical laminated assembly, a rod like metal center electrode connected to the laminated assembly, and a casing accommodating the laminated assembly which also acts as an outer electrode. The center electrode extends from the laminated assembly along the central axis, bends towards the wall of the casing and penetrates the casing. The center electrode is fixed to the casing via an insulating material at the point where it penetrates the casing. Four buffer members are interposed between the laminated assembly and the casing, each of buffer members being made of a metal plate, one end of the respective buffer members being fixed to the casing at the portion near the penetration point of the center electrode, the other end of the respective buffer members being fixed to the outside of the laminated assembly.

Abstract: A metal catalyst carrier for exhaust gas purification, comprising: a columnar metal honeycomb composed by spirally winding a laminate of a flat metal foil and a corrugated metal foil; a columnar metal case enclosing the metal honeycomb with a space remaining therebetween; and a cushion member disposed in the space and joined to the metal honeycomb and to the metal case alternately with respect to the column circumferential direction.

Abstract: A catalyst 1 is provided in a gas passage 4 for communicating between a gas flow-in unit 12 and a gas flow-out unit 13, and the catalyst 1 is heated by a heater 2, and a temperature sensor 3 for detecting the temperature of the heater 2 is provided inside the heater 2. By feeding power to the heater 2, the wall temperature of the heater 2 is raised to heat the catalyst 1, and then malodorous gas containing odor substances is passed in from the gas flow-in unit 12. The malodorous gas passes through the catalyst 1 in the gas passage 4 to be oxidized to be harmless and odorless, and is discharged from the gas flow-out unit 13.

Abstract: A flexible, resilient, intumescent mat material comprising fiber, binder, and an intumescent agent which includes a mixture of unexpanded vermiculite and expandable graphite undergoes intumescence at a lower temperature, with an enhanced degree of expansion and with a lesser degree of contraction upon prolonged heating. The intumescent mat can be employed in catalytic converters for motor vehicles and as a firestop material.

Abstract: This invention is directed to an electrically heatable catalyst device comprising an electrically insulating substrate carrying an electrically conductive material selected from metal oxides, carbides, nitrides and silicides, and applied thereon a washcoat carrying a catalyst.

Abstract: A honeycomb body includes an axis along which a flow of fluid is to be conducted through the honeycomb body. At least two oppositely disposed end surfaces define the honeycomb body along the axis. An internal structure for conducting an electric current for heating is formed of at least one sheet-metal layer. Metal support configurations each support the internal structure at a respective one of the end surfaces. An electric insulation is disposed between the internal structure and the support configuration. A method for producing an electrically heatable honeycomb body includes producing at least one approximately rectangular sheet-metal layer having two opposed end edges being aligned approximately perpendicularly to an axis. Each end edge is encompassed with a folded joint having a ceramic layer resting on the at least one sheet-metal layer, to form support configurations. The sheet-metal layer and the folded joints are corrugated at obtuse angles preferably being approximately perpendicularly to the axis.

Abstract: An electrically heatable honeycomb body through which a fluid can flow, in particular a carrier body for a catalytic converter, includes a plurality of subregions through which a current can flow over a winding path. The subregions have a first specific electrical conductivity per unit of cross-sectional area. Electrical insulation at least partially separates the subregions from one another. Additional electric conductor elements are disposed in regions in which the electric current is turned around. The additional electric conductor elements are formed of a material having a greater mechanical strength than that of the subregions and have a second specific electrical conductivity per unit of cross-sectional area being higher than the first specific electrical conductivity per unit of cross-sectional area.

Abstract: In a process for carrying out non-adiabatic catalytic reactions in a tubular heat exchange reactor by indirect heat exchange between a process stream and a heat conducting medium, the wall temperature at the critical outlet end of the reactor tube is decreased, by progressively supplying the heat conducting medium to the external surface of the reactor tube in increasing amounts from a region close to the outlet end to a region between the outlet end and the inlet end of the tube.

Abstract: The device for carrying out catalyzed reactions includes a plurality of layers, each of which provides an interspace which is filled with a catalyst material. The walls of each layer are impermeable to the catalyst material while being permeable to the reactants flowing in flow channels between the parallel layers. In one embodiment, separate guide elements may be used to space the layers apart and to define the flow channels. The catalyst material may be selected from solid particles, liquids and gases.

Abstract: An alternating-flow heat exchanger and method of forming is disclosed, in which a substrate is provided having open-ended, straight passageways therethrough, and at least one end cap for diverting flow in said passageways into primary and secondary flow paths. The ceramic substrate is coated with a desirable coating. The end cap is then applied to the substrate to direct flow from the passages in first and second flow paths.

Abstract: An apparatus for the catalytic combustion of exhaust gases in an exhaust system, in particular for an exhaust system of an internal combustion engine, and preferably for Otto engines, includes first and second honeycomb bodies through which a fluid can flow in succession. At least one of the honeycomb bodies is heatable, and the honeycomb bodies each have a multiplicity of channels formed therein defining-channel walls. A plurality of support elements each have at least one end, they extending between the first honeycomb body and the second honeycomb body, they join the first and second honeycomb bodies mechanically, they protrude at least partially into the honeycomb bodies in the vicinity of the at least one end, and they are in mechanical contact with the channel walls in the vicinity of the at least one end.

Abstract: This invention relates to a method for controlling the conductance of heated structures used to initiate faster light-off in emission control systems such as used for automotive catalytic converters, diesel particulate filters and industrial stacks and other applications in which the exhaust gas stream temperature is too low to initiate fast light-off. The invention also relates to a method for minimizing the amount of conductive material used for making such structures.

Abstract: A metallic carrier composed of an end face portion formed in at least one of the axial end portions of a honeycomb body and an outer circumferential reinforcing layer in which foils in a range from the outermost layer to a quarter of the total number of layers are joined together in the axial intermediate portion. Thus, the metallic carrier is flexible in expansion and shrinkage. Further, the honeycomb body and a jacket are joined to each other mainly at the outer circumference of the outer circumferential reinforcing layer of the honeycomb body, to reduce thermal stress developed between the honeycomb body and jacket while maintaining the strength against a high temperature, to thereby prevent the metallic carrier from being ruptured.

Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio of the solvent to charge flow rates of 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25 to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.

Abstract: A multicellular monolith converter body having a plurality of corrugated thin metal sheets or strips in alternating relation with a thin wire mesh or frame, and which monolith has a cell density up to 100 cells per square inch. These monoliths are useful under conditions where back-pressure is a critical factor, e.g., natural draft exhaust applications. These devices may have corrugated thin metal sheets coated with a refractory metal oxide, e.g., alumina, with or without a noble metal catalyst.

Abstract: A metallic carrier for carrying a catalyst for cleaning exhaust gas and a production method thereof, produced from corrugated plates having a trapezoidal cross section and flat plates, both being resistant to high-temperature oxidation, joined by welding and soldering in the vicinity of the welded portions, which are strongly joined and can be used with no problems of telescoping even under heavy heat cycles and gas pressures.

Abstract: A catalytic combustion apparatus has a cylindrical housing defining a fluid passage, and a plurality of combustion catalyst bodies arranged face to face along the fluid passage in the cylindrical housing. The catalyst bodies are loosely fitted in the cylindrical housing. Each catalyst body defines numerous bores extending along the fluid passage. The cylindrical housing includes holders extending inwardly of the housing for contacting end surfaces of the catalyst bodies to prevent movement thereof along the fluid passage.

Abstract: A high temperature resistant material including between approximately 28 and 60 dry weight percent of high temperature resistant ceramic fibers and between approximately 20 and 50 dry weight percent of high aspect ratio vermiculite.

Abstract: A core element for use in a catalytic converter, especially an electrically heatable catalytic converter, which core element is characterized by a corrugated thin metal strip having metal tabs attached to each end. The tabs are bent along one or more lines normal to the edges of the corrugated thin metal strip. When bent along one line, for example, an angular tab is formed. When the tabs are bent along an infinite number of lines a uniform amount, a circular segment is formed. A catalyst is deposited on one or both surfaces of the corrugated thin metal strips. A central portion of each strip is flat to enable location between the legs of a bifurcated central pin. The central pin with a group of such corrugated thin metal strips is then spirally wound about the central pin to provide a core with overlapped curved tabs defining at least two discrete generally spiral groups of resistance strips electrically isolated from each other.