A device that filters particulate matter from the exhaust stream of an engine includes a supporting structure with an elongate support, and a filter sleeve disposed within an exterior sleeve; a filter sleeve comprising a tubular shaft of filter material, the shaft having an open first end, and a closed second end; an exterior sleeve comprising a tubular shaft that defines an internal cavity that is sized and proportioned to receive the filter sleeve, the tubular shaft having an open first end, and a substantially closed second end, the substantially closed second end having a hole for filtered exhaust gases to pass through; and an attachment member that mounts the exterior sleeve to the supporting structure.

A device that filters particulate matter from the exhaust stream of an engine includes a supporting structure with an elongate support, and a filter sleeve disposed within an exterior sleeve; a filter sleeve comprising a tubular shaft of filter material, the shaft having an open first end, and a closed second end; an exterior sleeve comprising a tubular shaft that defines an internal cavity that is sized and proportioned to receive the filter sleeve, the tubular shaft having an open first end, and a substantially closed second end, the substantially closed second end having a hole for filtered exhaust gases to pass through; and an attachment member that mounts the exterior sleeve to the supporting structure.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

A slurry composition for a catalyst and a method for producing the same, a catalyst and a method for producing the same using the slurry composition for a catalyst. The method omits many heretofore required treatment steps and reduces catalyst production cost. The method comprising the steps of providing a slurry composition for a catalyst, comprising at least an aluminosilicate, Cu, and water, and having a solid concentration of 0.1% by mass to 90% by mass, wherein a component for a catalyst has composition represented by Al.sub.2O.sub.3.Math.xSiO.sub.2.Math.yT.sub.2O.Math.zCuO (wherein T is a quaternary ammonium cation, and x, y and z are numbers that satisfy 10x40, 0.1y<2.0, and 0.1z<2.0, respectively) in terms of molar ratio based on an oxide; coating at least one side of a support with this slurry composition; and heat-treating at 350 C. or higher.

A slurry composition for a catalyst and a method for producing the same, a catalyst and a method for producing the same using the slurry composition for a catalyst. The method omits many heretofore required treatment steps and reduces catalyst production cost. The method comprising the steps of providing a slurry composition for a catalyst, comprising at least an aluminosilicate, Cu, and water, and having a solid concentration of 0.1% by mass to 90% by mass, wherein a component for a catalyst has composition represented by Al.sub.2O.sub.3.xSiO.sub.2.yT.sub.2O.zCuO (wherein T is a quaternary ammonium cation, and x, y and z are numbers that satisfy 10x40, 0.1y<2.0, and 0.1z<2.0, respectively) in terms of molar ratio based on an oxide; coating at least one side of a support with this slurry composition; and heat-treating at 350 C. or higher.

A mat material including: inorganic fibers; and an oily fiber-scattering inhibitor attached to a surface of the inorganic fibers, wherein the amount of the fiber-scattering inhibitor attached is 0.05 to 2.0% by weight, and the mat material has an odor index of 80 or less as a relative value determined by an odor sensor from the odor of decomposed gas generated when the mat material is placed on a 500 C. hot plate, when the odor index of a mat material to which 1.0% by weight of an acrylic resin as a fiber-scattering inhibitor is attached is taken as 130.

Provided is a holding seal material including: alumina fibers, wherein the alumina fibers contain 85 to 98 wt % of an alumina component and 15 to 2 wt % of a silica component, the holding seal material has multiple marks formed by needle punching, and in a heat treatment test, a contact pressure of the holding seal material heated at a test temperature of 950 C. is 65 to 99% of a contact pressure of the holding seal material heated at test temperature of 800 C., wherein the heat treatment test includes: a compressing step of disposing the holding seal material between an upper plate and a lower plate and compressing the holding seal material to a gap bulk density (GBD) of 0.3 g/cm.sup.3; a heating step of heating, after the compressing step, the compressed holding seal material to a predetermined test temperature at a temperature-increasing rate of 45 C./min and maintaining the holding. seal material at the test temperature for six hours; a releasing step of cooling, after the heating step, the holding seal material to room temperature and releasing the holding seal material to a gap bulk density (GBD) of 0.27 g/cm.sup.3; and a cycling step of repeating, after the releasing step, 1000 times the cycle of re-compression of the holding seal material to a gap bulk density (GBD) of 0.3 g/cm.sup.3 and re-release of the holding seal material to a gap bulk density (GBD) of 0.27 g/cm.sup.3 so as to calculate the contact pressure (kPa) of the holding seal material by dividing the load at the last re-release in the cycling step by the area of the holding seal material.

Provided are an inorganic fiber-formed article having both high basis weight and excellent peel strength and a mat for an exhaust gas cleaning apparatus and an exhaust gas cleaning apparatus including the inorganic fiber-formed article. The inorganic fiber-formed article includes inorganic fibers and needle marks extending in the thickness direction and including vertical bundles composed of the inorganic fibers extending in the thickness direction, in which the average volume of the vertical bundles per needle mark measured by a prescribed peel test is 1.0 mm.sup.3 or more.