Structured catalyst for oxidation for exhaust gas purification, method for producing same, automobile exhaust gas treatment device, catalytic molding, and gas purification method

Abstract

The structured catalyst for oxidation for exhaust gas purification includes a support having a porous structure constituted by a zeolite-type compound, and at least one type of oxidation catalyst that is present in the support and selected from the group consisting of metal and metal oxide, the support having channels that communicate with each other, and the oxidation catalyst being present in at least the channels of the support.

What is claimed is: 
     
         1 . A method for producing a structured catalyst for oxidation for exhaust gas purification, comprising:
 a calcination step of a precursor material (B) obtained by impregnating a precursor material (A) for obtaining a support of a porous structure composed of zeolite-type compound with a metal-containing solution; and   a hydrothermal treatment step of hydrothermally treating a precursor material (C) obtained by calcining the precursor material (B) to obtain the support and an oxidation catalyst present in the support.   
     
     
         2 . The method for producing a structured catalyst for oxidation for exhaust gas purification according to  claim 1 , further comprising a step of performing reduction treatment on the hydrothermally treated precursor material (C) after the hydrothermal treatment step. 
     
     
         3 . The method for producing a structured catalyst for oxidation for exhaust gas purification according to  claim 1 , wherein 50 to 500 mass % of a non-ionic surfactant is added to the precursor material (A) before the calcination step. 
     
     
         4 . The method for producing a structured catalyst for oxidation for exhaust gas purification according to  claim 1 , wherein the precursor material (A) is impregnated with the metal-containing solution by adding the metal-containing solution to the precursor material (A) in multiple portions before the calcination step. 
     
     
         5 . The method for producing a structured catalyst for oxidation for exhaust gas purification according to  claim 1 , wherein in impregnating the precursor material (A) with the metal-containing solution before the calcination step, a value obtained by converting the added amount of the metal-containing solution added to the precursor material (A) to a ratio of silicon (Si) constituting the precursor material (A) to a metal element (M) included in the metal-containing solution added to the precursor material (A) (a ratio of number of atoms SUM) is adjusted to from 10 to 1000.