THREE-WAY CATALYST HAVING LOW NH3 FORMATION AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2022/165887

A1

The present invention relates to applications of catalytic techniques and the field of environmental protection related to air pollution control, and specifically relates to a three-way catalyst having low NH3 formation and a preparation method therefor. The three-way catalyst (TWC) consists of a carrier and a coating material. The coating material consists of a precious metal active component and a catalytic material. The precious metal component comprises a first precious metal active component and a second precious metal active component. The first precious metal active component is a composition containing Ru. The second precious metal active component is a composition containing Pt, Pd, and Rh or a composition containing Pd and Rh. By adding metal ruthenium or a ruthenium oxide to the coating material, the N2 selectivity of the TWC is increased, the formation of byproduct NH3 of the TWC is reduced, the formation of NH3 is reduced from the source, and some of the NH3 formed are decomposed into N2 and H2 on the Ru catalystt, thus avoiding byproduct NH3 formed when AOC is employed to purify the TWC, and providing a novel solution for effectively solving the problem of excessive NH3 emission.

WANG YUN (CN)
CHEN YONGXIANG (CN)
DU HONGYI (CN)
WANG QIN (CN)
XU HAIDI (CN)
LONG HAI (CN)
XIAN DENGBING (CN)
HUANG RENLIANG (CN)
LUO TIANTIAN (CN)
LIU MEIXIA (CN)
CHEN CUIRONG (CN)
CHEN DEQUAN (CN)

PCT/CN2021/078494

August 11, 2022

March 01, 2021

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SINOCAT ENVIRONMENTAL TECH CO LTD (CN)

B01D53/94; B01J23/63; B01J23/40

CN105813733A	2016-07-27
CN111905728A	2020-11-10
EP1254712A1	2002-11-06
US20020049137A1	2002-04-25
US20080139382A1	2008-06-12
CN111135827A	2020-05-12

SICHUAN LIJIU LAW FIRM (CN)

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