Abstract: In a honeycomb filter 20, partition portions and trapping layers are formed such that a pore volume difference that is obtained from pore distributions measured by mercury porosimetry and is a difference in volume of pores having a diameter of 10 ?m or less between the downstream portion and the upstream portion of the honeycomb filter, is in the range of 0.01 cm3/g or more and 0.08 cm3/g or less. In the honeycomb filter, in the downstream portion, a first pore volume peak is present in a first pore diameter range of 2 ?m or more and 9 ?m or less and a second pore volume peak that is higher than the first pore volume peak is present in a second pore diameter range of 10 ?m or more and 25 ?m or less.

Abstract: An exhaust treatment device comprises a housing defining an inlet opening and an outlet opening, a first catalyst brick and a second catalyst brick each having an inlet end and an outlet end, a first insulating support cover, and a second insulating support cover. The first catalyst brick is disposed within a first segment of the housing, and the second catalyst brick is disposed within a second segment of the housing. The first segment has an inner periphery that is not equal to an inner periphery of the second segment. The first and second catalyst bricks each have nonuniform dimensions with respect to one another. The first and second segments of the housing are independently dimensioned in proportion to the first and second catalyst bricks respectively. The first insulating support cover is disposed within the first segment of the housing in a first annular space between an inner surface of the housing and an exterior surface of the first catalyst brick.

Abstract: A manufacturing method by which alumina-silica based fibers excellent in mechanical strength can be readily and securely obtained. The method obtains precursor fibers as a material by using an alumina-silica based fiber spinning stock solution for use in an inorganic salt method. Next, the precursor fibers are heated under an environment which makes it difficult to carry out an oxidizing reaction on the carbon component contained in the precursor fibers. Thus, the precursor fibers are sintered to obtain alumina-silica based fibers.

Abstract: A housing (2) for an exhaust gas-treating device (1) of an exhaust system of an internal combustion engine includes a jacket (6) closed in the circumferential direction for mounting at least one exhaust gas-treating element (5. The jacket passes over at at least one axial end into a ring body (8, 9). The ring body (8, 9) is closed in the circumferential direction. The housing (2) can be connected to another component of the exhaust system. A simplified manufacture is achieved if the jacket (6) and the at least one ring body (8, 9) are manufactured from a single sheet steel billet (10) by rolling the sheet steel billet (10) in the circumferential direction and by connecting abutting edges (11) of the sheet steel billet (10). The jacket (6) and the at least one ring body (8, 9) differ from one another by different materials and/or different wall thicknesses (12, 13, 14).

Abstract: An electrically-heated catalytic converter comprises a catalyst support which produces heat when electric current is applied, a holding mat made of an electrical insulating material, the holding mat being provided so as to cover an outer circumference of the catalyst support, and a case which houses the catalyst support and holds the catalyst support via the holding mat. The catalytic converter treats gas flowing in the case by a catalyst supported on the catalyst support. The holding mat has a water-absorbing property. An insulation layer made of an electrical insulating material is provided between the case and the holding mat.

Abstract: An exhaust treatment device includes an inner shell, an outer shell and insulation material positioned between the inner shell and the outer shell. An inlet tube has an end in communication with a cavity defined by the inner shell. A substrate for treating engine exhaust is positioned within the inner shell. A baffle plate includes a plurality of apertures positioned such that the exhaust passes through the apertures prior to entering the substrate. The baffle plate supports an end of the inner shell and the inlet tube.

Abstract: An exhaust gas oxidation catalyst characterized as an exhaust gas oxidation catalyst comprising a catalyst substrate, wherein a plurality of exhaust gas channels has been formed, and a catalyst layer formed on the surface of the exhaust gas channels in the catalyst substrate; wherein a catalyst layer consisting of a bottom catalyst layer, a top catalyst layer exposed within the exhaust gas channels, and an intermediate catalyst layer located between the bottom catalyst layer and top catalyst layer, is provided so as to cover not less than 25% of the exhaust gas channel surface, and wherein the bottom catalyst layer contains at least an oxygen-occluding agent as catalyst component but does not contain a hydrocarbon adsorbent, the intermediate catalyst layer contains at least catalyst metal, supported on a metal oxide support, and a hydrocarbon adsorbent as catalyst components, and the top catalyst layer contains at least an oxygen-occluding agent and a hydrocarbon adsorbent as catalyst components.

Abstract: A mounting mat for an exhaust gas treatment device includes a blend of inorganic fibers and organic nanofibrillated fibers. An exhaust gas treatment device includes a housing and a fragile structure mounted within the housing by the mounting mat that is disposed in a gap between the housing and the fragile catalyst support structure. Additionally disclosed are methods of making a mounting mat for an exhaust gas treatment device and for making an exhaust gas treatment device incorporating the mounting mat.

Abstract: A honeycomb structural body has a honeycomb body and a pair of electrodes. The honeycomb body has a cell formation part and an outer skin part of a cylindrical hollow shape. The electrodes are formed on an outer peripheral surface of the outer skin part so that the electrodes face to each other in a diameter direction of the honeycomb body. Each of the electrodes has a reference electrode part formed at a central part of the electrode and one or more outside electrode parts formed at both ends of the reference electrode part. The reference electrode parts of the electrode face to each other. The outside electrode parts of the electrodes face to each other. An electrical resistivity of the reference electrode part is smaller than an electrical resistivity of each of the outside electrode parts in each of the electrodes.

Abstract: A holding sealing material includes laminated mats. One or more fixed parts partially combine the mats. Each of the mats has a basic rectangular shape. Each of the mats has a recess on one of shorter sides of the rectangular shape and a projection on another shorter side and is designed to be wound around an object to be wound so that the projection and the recess are fitted to each other. The mats have respective longitudinal lengths that increase as a distance from the object to each of the mats increases. A mat that is placed at a closest position to the object has a shortest longitudinal length. An area of the projection of the mat that is placed at a closest position to the object is smaller than an area of the projection of a mat that is placed at a farthest position from the object.

Abstract: The present invention relates to a treatment system for a gasoline engine exhaust gas stream comprising a particulate filter, said particulate filter comprising: a particulate filter substrate, an inlet layer disposed on the exhaust gas inlet surface of the filter substrate, and an outlet layer disposed on the exhaust gas outlet surface of the filter substrate, wherein the inlet layer comprises Rh and/or Pd, and the outlet layer comprises Rh and/or a zeolite.

Abstract: A catalytic converter includes a housing defining an interior space, with a monolith supported therein. The monolith includes a catalyst disposed thereon. The catalytic converter includes a flow directing mechanism defined by one of the housing and/or the monolith to re-direct a flow of exhaust gas across the monolith to obtain a more even flow distribution of exhaust gas across the monolith. The monolith may include different regions, with each region including a different catalyst density disposed thereon. The catalyst density of each region may be optimized for the flow rate of exhaust gas across the monolith through each region.

Abstract: Electricity is suppressed from flowing through a case of an electrically heated catalyst.

Abstract: The invention provides a method of making a flexible and self-supporting insulating end cone liner comprising resilient and compressible non-intumescent material molded into a single, continuous piece having a three dimensional cone shape, with the insulating material comprising inorganic fibers and a binder, as well as a method of making a pollution control device that includes such an end cone liner.

Abstract: A multilayer mounting mat for an exhaust gas treatment device including high temperature resistant inorganic fibers, optionally organic binder, and optionally intumescent material. A plurality of the mounting mat plies contain a substantial proportion of the inorganic fibers oriented in the x-y plane of the mounting mat. An exhaust gas treatment device includes a housing, a fragile catalyst support structure resiliently mounted within the housing, and the multilayer mounting mat disposed in a gap between the housing and the fragile catalyst support structure.

Abstract: Disclosed is a catalyst carrier which is used for carrying a catalyst thereon. The catalyst carrier is characterized in that the apparent specific heat measured at 800° C. is 1.8 times or more greater than that measured at room temperature, wherein the apparent specific heat means a charge heat amount required for substantially increasing the temperature of a unit mass (kg) by 1 K, inclusive of the influence of endotherm or exotherm caused by change in crystalline form, partial melting, coagulation, phase transformation, vitrification, amorphous-formation, crystallization and the like.

Abstract: A diesel exhaust gas purification catalyst contains a substrate, and a catalyst layer formed on the substrate. The catalyst layer contains a carrier, a noble metal and/or an oxide thereof supported by the carrier, and a composite oxide of cerium and one or more Group III and/or Group IV elements. The diesel exhaust gas purification catalyst when in use is disposed on an upstream side of an exhaust gas stream with respect to a denitration catalyst.

Abstract: An exhaust treatment device includes an insulation material positioned between an inner shell and an outer shell. An inlet tube has an end in communication with a cavity defined by the inner shell. A substrate for treating engine exhaust is positioned within the inner shell. A metal mounting ring is positioned between the inner and outer shells and includes a mounting provision for receipt of a fastener.

Abstract: A honeycomb structure includes a ceramic block including a plurality of honeycomb fired bodies. Each of the plurality of honeycomb fired bodies includes large volume cells and small volume cells. Either one of the end portions of each of the large volume cells and the small volume cells is plugged. An aperture in the cross section in a central part of the honeycomb structure is about 65% or more. A ratio of an aperture of the first end face to an aperture of the second end face of the honeycomb structure is about 1.4 or more. Each of the cell walls except the peripheral walls has a thickness of about 0.1 mm to about 0.2 mm. The honeycomb structure has a diameter of about 200 mm or more. A ratio of a length to the diameter of the honeycomb structure is about 1.0 or less.

Abstract: An exhaust gas purifying apparatus has a first housing including a DOC converter and DPF, and a second housing including an SCR converter, the housings disposed in parallel on the outer side of a frame such that the exhaust upstream ends thereof are positioned on the outer side in the vehicle width direction. An outlet port of the first housing and an inlet port of the second housing are communicatively connected through a communication pipe. The first housing is dividable into a first casing accommodating the DOC converter and a second casing accommodating the DPF, the two casings separably fastened by bolts. The inlet port of the first casing housing is bent inwardly in the width direction and detachably fastened to an exhaust pipe, the distal end of which opens outwardly in the width direction, through bolts. The second casing and housing are fixed to the frame through two brackets.