TRIPLE CATALYST, CONTAINING EXTRUDED SOLID MASS Russian patent published in 2016 - IPC B01J23/38 B01J29/00 B01J35/04 B01J23/63 B01J37/04 B01J37/08 B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to triple catalyst for processing emissions of waste gases from internal combustion engines with positive ignition, installed on vehicles, filter for soot with triple catalyst, method for catalyst obtaining, method for processing emissions of wasted gases, exhaust system for internal combustion engine and vehicle. Catalyst contains extruded solid mass, containing 10-95 wt % of, at least, one component of binding substance/matrix; 5-90 wt % of synthetic alumosilicate zeolite molecular sieve or mixture of any two or more of them, with each one containing pore opening structure with ring of 10 atoms or more as its largest pore opening structure and is characterised by ratio of silicon dioxide to aluminium oxide from 10 to 150; and 0-80 wt % of optionally stabilised cerium oxide. In addition, said catalyst contains, at least, one noble metal and, optionally, at least, one base metal, where (i) at least, one noble metal is in one or several layers of coating on the surface of extruded solid mass; (ii) in extruded solid mass present is at least, one transition metal, which is associated with said zeolite molecular sieve and is selected from the group, consisting of Cu, Pd and Ag, and, at least, one noble metal is also present in one or several layers of coating on the surface of extruded solid mass or (iii) in extruded solid mass present is at least, one transition metal, which is associated with said zeolite molecular sieve and is selected from the group, consisting of Cu, Pd and Ag, with, at least, one transition metal, selected from the group, consisting of Cu, Pd and Ag, being present on the surface of extruded solid mass at higher concentration; and, at least, one noble metal is also present in one or several layers of coating on the surface of extruded solid mass. Method for catalyst obtaining includes the following stages: formation of solid extruded mass by mixing powder-like initial materials, processing by mixing and/or masticating in acidic or alkaline water solution into plastic substance with formation of mixture; extrusion of mixture in form of catalyst mass, drying catalyst mass and calcinations with formation of solid extruded mass; selection of quantitative proportions of initial materials in such a way that ratio of components corresponds to the one given above; and covering the surface of solid extruded mass with a layer of coating, containing platinum group metal, and, optionally, impregnation of the surface of solid extruded mass with transition metal Cu, Pd or Ar.

EFFECT: possibility to use molecular sieves with lower silicon dioxide:aluminium oxide ratio, which makes it possible for molecular sieves to avoid participation in ion exchange with metals, facilitating adsorption of hydrocarbons, to a larger extent.

18 cl, 4 dwg, 2 tbl, 7 ex