Abstract: A method for producing a zeolite with improved Si/Al according to the present invention includes the steps of: subjecting a zeolite synthesized without using an organic structure directing agent to ion exchange, thereby obtaining a sodium-type, a proton-type, or an ammonium-type zeolite; and bringing the zeolite subjected to ion exchange into contact with an ammonium salt solution, thereby dealuminating the zeolite. It is preferable that the ammonium salt is any one of ammonium oxalate, ammonium fluoride, ammonium fluorosilicate, ammonium fluoroborate, ammonium fluorophosphate, ammonium fluorotitanate, and ammonium florozirconate. It is also preferable that the zeolite after ion exchange is exposed to water vapor, and is then brought into contact with the ammonium salt solution.

Abstract: Provided is a beta zeolite satisfying P>76.79Q?29.514 in a range in which Q is less than 0.4011 nm, wherein, P represents an AB value that is an intensity ratio of A to B, A represents a diffraction intensity of a main peak of the beta zeolite observed by X-ray diffraction measurement, B represents a diffraction intensity of the (116) plane of ?-alumina obtained by X-ray diffraction measurement under the same conditions as those for the X-ray diffraction measurement on the beta zeolite, the ?-alumina being the standard substance 674a distributed by the American National Institute of Standards and Technology, and Q represents a lattice interplanar spacing of the main peak of the beta zeolite observed by X-ray diffraction measurement. It is preferable that the formula (1) above is satisfied in a range in which Q is from 0.3940 to 0.4000 nm.

Abstract: An exhaust gas purification catalyst is provided which can be more enhanced in NOx purification performance.

Abstract: The purpose of the present invention is to provide a metal-substituted beta zeolite that exhibits a more excellent catalytic performance than conventional one, and a method for producing the same. The present invention provides a metal-substituted beta zeolite by subjecting an alkali metal-form beta zeolite produced without using an organic structure-directing agent to ion exchange with ammonium ion and then, using a filter cake procedure, to ion exchange with copper ion or iron(II) ion. The present invention also provides a metal-substituted beta zeolite which has been ion exchanged with copper ion or iron(II) ion and in which the amount of Lewis acid sites is greater than the amount of Bronsted acid sites when the amount of Bronsted acid sites and the amount of Lewis acid sites are measured by ammonia infrared-mass spectroscopy temperature-programmed desorption on the as-produced state.

Abstract: The purpose of the present invention is to provide a metal-substituted beta zeolite that exhibits a more excellent catalytic performance than conventional one, and a method for producing the same. The present invention provides a metal-substituted beta zeolite by subjecting an alkali metal-form beta zeolite produced without using an organic structure-directing agent to ion exchange with ammonium ion and then, using a filter cake procedure, to ion exchange with copper ion or iron(II) ion. The present invention also provides a metal-substituted beta zeolite which has been ion exchanged with copper ion or iron(II) ion and in which the amount of Lewis acid sites is greater than the amount of Bronsted acid sites when the amount of Bronsted acid sites and the amount of Lewis acid sites are measured by ammonia infrared-mass spectroscopy temperature-programmed desorption on the as-produced state.

Abstract: An exhaust gas purification device is equipped with: an NOx purification unit disposed in exhaust gas piping of an engine supporting an NOx storage catalyst (NSC); a catalyzed soot filter (CSF) disposed downstream of the NOx purification unit supporting a particulate combustion catalyst causing captured particulates to combust; and an electronic control unit (ECU) which controls exhaust gas flowing into the NSC to be rich and which, by raising the temperature of the NSC, acts as a regeneration device that causes sulfur components captured in the NSC to be desorbed. The particulate combustion catalyst is provided where Ag and Pd have been alloyed on an Al2O3 carrier; the quantity of Ag supported by the Al2O3 carrier is 1.2-2.5 g/L; the quantity of Pd supported by the Al2O3 carrier is 0.7 g/L or less; and the ratio Ag/Pd of the Ag support quantity to the Pd support quantity is 1.7-8.3.

Abstract: An exhaust gas purification device is equipped with: an NOx purification unit disposed in exhaust gas piping of an engine supporting an NOx storage catalyst (NSC); a catalyzed soot filter (CSF) disposed downstream of the NOx purification unit supporting a particulate combustion catalyst causing captured particulates to combust; and an electronic control unit (ECU) which controls exhaust gas flowing into the NSC to be rich and which, by raising the temperature of the NSC, acts as a regeneration device that causes sulfur components captured in the NSC to be desorbed. The particulate combustion catalyst is provided where Ag and Pd have been alloyed on an Al2O3 carrier; the quantity of Ag supported by the Al2O3 carrier is 1.2-2.5 g/L; the quantity of Pd supported by the Al2O3 carrier is 0.7 g/L or less; and the ratio Ag/Pd of the Ag support quantity to the Pd support quantity is 1.7-8.3.

Abstract: Provided is a novel DPF which can prevent PM from accumulating on the surface and interior of a filter substrate, and can suppress an increase in back pressure caused by exhaust gas. The DPF has a configuration in which an inorganic porous layer, which includes a metal oxide or a metal composite oxide and provided with surface irregularities having a thickness of at least 50% of the thickness of the inorganic porous layer, is formed on part or all of the surface of the dividing wall on the side where exhaust gas flows in.

Abstract: Provided is a novel DPF which can prevent PM from accumulating on the surface and interior of a filter substrate, and can suppress an increase in back pressure caused by exhaust gas. The DPF has a configuration in which an inorganic porous layer, which includes a metal oxide or a metal composite oxide and provided with surface irregularities having a thickness of at least 50% of the thickness of the inorganic porous layer, is formed on part or all of the surface of the dividing wall on the side where exhaust gas flows in.