Abstract: A titania-coated honeycomb catalyst matrix is provided for the ultraviolet-photocatalytic oxidation of organic pollutants in a flowing fluid. A honeycomb-shaped skeletal structure (12) has a thin, lightweight substrate (18) of metal or ceramic, typically an aluminum alloy, and a surface coating (20) of photocatalyst, such as titania. The photocatalyst (20) is bonded to the substrate (18) via a thin oxide layer (18′) on the substrate. The oxide layer (18′) may be grown on the substrate. The photocatalyst coating (20) is made by mixing (30) titania powder in a TiO2 sol-gel to form a titania slurry. The substrate with oxide layer is coated (30) with the titania slurry and then heat treated (31). The photocatalyst coating (20) is typically applied to substrate sheets (40, 60, 62) preformed for assembly into a honeycomb-shaped skeletal structure (12) having an array of parallel cells (46, 46′).

Abstract: Extruded honeycomb dehydrogenation catalysts of high structural integrity, composed of potassium oxide (carbonate)-promoted oxide-stabilized iron oxides and having a honeycomb cell density in the range of 15-400 channels per square inch, a channel wall thickness in the range of 0.2-3 mm, and an axial crushing strength in excess of 100 psi, are prepared from extrusion batches incorporating polymer binders exhibiting improved compatibility with high batch concentrations of dissolved catalyst precursors or constituents.

Abstract: An exhaust gas purifying catalyst comprises a hydrocarbon adsorbent layer containing zeolite as a main component and a metal-based catalyst layer containing any noble metal such as palladium, platinum, rhodium, etc. on a monolithic support that has a plurality of cells whose sectional shape is a regular N-polygon. In the case that Rc is a distance from a center of gravity to an inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity of the regular N-polygon in the cell sectional shape to a corner of the N-polygon, and Rf is a distance from the center of gravity to the inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity perpendicularly to respective sides of the regular N-polygon, a ratio Rc/Rf is set to less than or equal to 1.7 in a cell sectional shape.

Abstract: Fine circumferential skin cracking in extruded thin-walled cordierite honeycombs having channel wall thicknesses not exceeding about 0.004 inches (100 &mgr;m) but skin layers of substantially higher thickness is prevented by extruding the honeycombs under conditions that enhance cordierite crystal alignment in the skin; thin-walled honeycomb products having skins free of fine cracks that are well-matched in thermal expansion to the honeycomb cores are provided.

Abstract: Zeolite/alumina composite, and a method for making, the composite for use as a catalyst substrate or catalyst carrier and comprising zeolite having a silica/alumina ratio of greater than 300 and gamma alumina having a specific surface area of greater than 100 m2/g. The zeolite/alumina composite exhibits a modulus of rupture of at least 750 psi. Additionally, the invention is also directed at a three catalyst (TWC) system for use in the removal of hydrocarbons, carbon monoxide and oxides of nitrogen from waste gas, the TWC system comprising the following components: (1) a zeolite/alumina composite catalyst support exhibiting a modulus of rupture of at least 750 psi and having a zeolite with a silica/zeolite ratio of at least 300 and the alumina comprising a gamma alumina having a specific surface area of greater than 100 m2/g; and, (2) a noble metal catalyst impregnated on the catalyst support, the noble metal selected from the group consisting of platinum, rhodium, iridium and palladium.

Abstract: A metal substrate is fabricated and coated with a catalyst for ozone conversion of atmosphere passing through the substrate. A plurality of aluminum foil sheets that have been slit, stretched and twisted into a plurality of regularly repeating channels having geometrically shaped openings are serially positioned one on top the other to form a foil stack with channel openings partially blocked by channel walls of overlying foil sheets. Thicker covers with openings at the top and bottom of the stack form a sandwich and the sandwich pleated to form corrugations in a flexible but rigid sandwich substrate. The channel walls are coated with an ozone depleting catalyst which the ozone atmosphere contacts to remove ozone as the ozone atmosphere travels through the stack construction.

Abstract: A process for making a honeycomb article having longitudinal channels extending from one face to a second face supporting a uniform coating of activated carbon on the channel walls, the process comprising the step of providing a solid heat-activated oxidant within the channels and heating the article to release the oxidant and uniformly activate the carbon coating.

Abstract: The present invention improves a ceramic carrier capable of directly supporting a catalyst component and provides a ceramic carrier and a ceramic catalyst body which have high catalyst performance and practical value.

Abstract: A mechanical separator intended to collect particles contained in gaseous effluents smaller than or of the order of one micrometer in size, includes at least one channel for turbulent flow of the effluents, preferably several parallel channels formed in a porous structure having particle collection surfaces. The separator also has a series of small elements made of ultrafine fibers, the elements being fixed to the surface of the particle collecting surfaces.

Abstract: A honeycomb body made from a ceramic material with improved radial pressure resistance that is of cylindrical shape and features a first and a second end face and a cylindrical shell and that is traversed from one end face to the other by axially parallel channels formed by channel walls and distributed across the cross section of the honeycomb body in a regular grid pattern, in which design an outer marginal zone of the honeycomb body, the thickness of which amounts to several channel diameters, encloses a central area. The increase in radial pressure resistance of the honeycomb body is achieved by reinforcing the ceramic material of the cylindrical shell and of the channel walls in the outer marginal zone of the honeycomb body by depositing on or in it one or several inorganic substances for the purpose of increasing its mechanical stability.

Abstract: A gas diffusion electrode for solid polymer electrolyte fuel cell comprising a gas diffusion electrode and a catalyst layer, characterized in that said catalyst layer is provided with a catalytic substance and an ion exchange resin having pores. In this arrangement, a three-phase boundary can be provided also inside the catalyst layer while maintaining sufficient electron conductivity, capability of supplying reaction gas and protonic conductance, making it possible to enhance the polarization characteristics and power density thereof.

Abstract: A honeycomb body configuration includes a metal housing accommodating a honeycomb body having a plurality of channels separated from one another by dividing walls. The honeycomb body has varying radial strength along its periphery. A compensation layer is disposed at least in partial regions of the periphery between the housing and the honeycomb body. The compensation layer has at least two support sections in the peripheral direction of the honeycomb body which exert greater forces in the radial direction upon the honeycomb body than outside the support sections in remaining peripheral regions. The support sections are disposed in regions where the honeycomb body has greater radial strength. Steps can be taken to produce the support sections on the compensation layer, by using support segments on the housing and/or beads on the honeycomb body, in each case in the peripheral regions of greater strength.

Abstract: A silicon nitride porous body which is a body having a generally columnar outer shape and at least two through-holes mutually parallel to one another and which has generally perpendicularly oriented columnar crystals on the surface of the through-holes.

Abstract: A ceramic honeycomb structure includes a plurality of through-holes surrounded by partition walls, wherein a thermal expansion coefficient of an outer circumferential wall portion in the ceramic honeycomb structure is larger than a thermal expansion coefficient in a direction of a diameter of an inside partition wall portion 5 in the ceramic honeycomb structure, and stress is applied to the inside partition wall portion from the outer circumferential wall portion. An outer circumferential wall portion of the ceramic honeycomb structure is reinforced, and the ceramic honeycomb structure does not hinder a flow of gas in a circumferential partition wall portion of the ceramic honeycomb structure, and thermal shock resistance of the ceramic honeycomb structure is enhanced profitably.

Abstract: The present invention discloses metallic fiber boards having catalytic functionality and processes for producing the same. The boards are formed from a mesh of metallic fibers, each fiber having a first layer of an oxide and a second layer of a porous oxide. A catalyst, either disposed on the surface of the second layer, or dispersed within the second layer, provides catalytic functionality to the fiber board. The first layer is produced by thermal oxidation of the metallic fibers, while the second layer and catalyst are produced by thermal decomposition of precursor materials applied to the fiber board while in solution, typically as a spray of atomized droplets. The resulting boards are used to catalyze the combustion of hydrocarbons, especially methane, and particularly in household boilers.

Abstract: Electric arc spraying a metal onto a substrate produces an anchor layer on the substrate that serves as a surprisingly superior intermediate layer for a catalytic material deposited thereon. Spalling of catalytic material is resisted even when subjected to the harsh conditions imposed by small engines or in a close-coupled position for a larger engine.

Abstract: A metallic catalyst carrier body for the cleaning or treatment of an exhaust-gas flow, in particular of small engines, includes a multiplicity of strip-shaped foils which are joined together in the form of a honeycomb structure. The foils form a foil assembly structure in which mutually adjacent respective foils are securely interconnected at connecting locations that are spaced apart from one another and offset alternatingly relative to one another. If the foil assembly is stretched, for example by winding the same into a hollow body, the honeycomb structure is formed, defining flow channels with at least one radial directional component in its interior, through the use of cells.

Abstract: A composite catalyst includes a first catalyst part containing an Ir catalyst and a second catalyst part covering the first catalyst part and containing a perovskite type composite oxide. The perovskite type composite oxide contributes mainly to oxidation reaction such as NO+O2→NO2 in an atmosphere of excess oxygen while the Ir catalyst contributes mainly to reduction reaction with HC (hydrocarbon) as a reducing agent such as NO2+HC+O2→N2+CO2+H2O.

Abstract: A Fischer-Tropsch catalyst for the conversion of synthesis gas into Fischer-Tropsch products includes a stationary Fischer-Tropsch catalyst having a voidage ratio greater than approximately 0.45 or 0.6 and may further have a catalyst concentration for a given reactor volume of at least 10 percent. A Fischer-Tropsch catalyst has a structured shape promoting non-Taylor flow and/or producing a productivity in the range of 200-4000 vol CO/vol. Catalyst/hour or greater over at least a 600 hour run of a Fischer-Tropsch reactor with the catalyst therein. A system for converting synthesis gas into longer-chain hydrocarbon products through the Fisher-Tropsch reaction has a reactor for receiving synthesis gas directly or as a saturated hydrocarbon liquid or a combination, and a stationary, structured Fischer-Tropsch catalyst disposed within the reactor for converting at least a portion of the synthesis gas into longer-chain hydrocarbons through Fischer-Tropsch reaction.

Abstract: The present invention provides a honeycomb structure that is able to suppress separation of a loaded catalyst layer much better than the prior art, and its production process. This honeycomb structure is made in the form of honeycombs partitions having for their main component cordierite having a chemical composition of 45-55 wt % SiO2, 33-42 wt % Al2O3 and 12-18 wt % MgO, and fifty or more pores (number/1.65 mm2) having a mean diameter of 1-20 &mgr;m are provided in the surfaces of the partitions.

Abstract: The present invention provides a ceramic honeycomb structural body, and method for preparing the same, which can satisfactorily support a catalyst and can demonstrate superior mechanical strength, even if far thinner walls are used. Said structural body comprises lattice walls formed by a large number of cells 10 which are channels for a fluid and a peripheral wall 12 which covers at least the circumference of said lattice walls 11.

Abstract: A ceramic filter module includes a plurality of passage holes (11) and internal passage holes (12) alternately arranged about a plurality of ceramic partitions (15). The internal passage holes are sealed at each end by seals (13). The partitions are at most 1 mm thick and allow fluid to be filtered as the fluid flows from passage holes (11) to the internal passage holes (12). A plurality of discharge holes (14) traversing through the ceramic partitions between adjacent internal passage holes or between an internal passage hole and an outer surface allow the permeate to exit. The module is a porous ceramic body that preferably has an average pore diameter of 1 &mgr;m and is composed of silicon nitride. The ceramic filter module has the advantages of low permeation resistance and very high permeability.

Abstract: A monolithic structure having active material that includes at least inorganic ion exchange material, for purifying a liquid stream of contaminants such as heavy metals, chlorine, volatile organics, pesticides, herbicides, and/or parasites, etc. The structure has an inlet end and an outlet end and a multiplicity of cells extending from inlet to outlet end. The cells are separated from one another by porous walls that are alternatively plugged at each end such that a liquid stream that enters the structure, enters through the unplugged cells at the inlet end and passes through porous walls to be purified by the active material, and thereafter passes out of the structure through unplugged cells at the outlet end. One method of making the structure involves applying active material as a coating on an alternately plugged substrate. The average particle size of the active material after calcination is greater than the average cell wall pore size of the substrate.