EXHAUST GAS PURIFICATION CATALYST - MITSUI MINING & SMELTING CO LTD

Title:

EXHAUST GAS PURIFICATION CATALYST

Document Type and Number:

WIPO Patent Application WO/2021/261363

Kind Code:

A1

Abstract:

Provided is an exhaust gas purification catalyst with which phosphorus poisoning is minimized and long-term durability is improved.　The exhaust gas purification catalyst is provided with a phosphorus collection layer and a catalyst layer containing at least one type of precious metal element Ｍｐ selected from the group consisting of Pt, Pd, and Rh. The phosphorus collection layer is positioned on the upper layer side and/or the upstream side of the catalyst layer. The phosphorus collection layer contains a composite oxide having a cubic spinel structure belonging to the space group Fd-3m and containing Al and an alkali earth metal element Ma that includes Mg and that may include at least one element selected from the group consisting of Ca, Sr, and Ba. The Ma/Mg molar ratio of the composite oxide is in the range of 0.02 to 0.60 inclusive. The X-ray diffraction spectrum of the composite oxide has a peak deriving from the cubic spinel structure belonging to the space group Fd-3m of the composite oxide, between diffraction angle 2θxM a O, which is the position of a peak deriving from the alkali earth metal oxide MaO, and diffraction angle 2θxAl2O3, which is the position of a peak deriving from the aluminum oxide Al2O3.　

Inventors:

KOMANOYA TASUKU (JP)

Application Number:

PCT/JP2021/022974

Publication Date:

December 30, 2021

Filing Date:

June 17, 2021

Export Citation:

Click for automatic bibliography generation Help

Assignee:

MITSUI MINING & SMELTING CO LTD (JP)

International Classes:

B01J33/00; B01D53/94; B01J23/63; F01N3/10

Domestic Patent References:

WO2006044974A1

2006-04-27

Foreign References:

JP2018171615A	2018-11-08
JP2015066516A	2015-04-13
JP2015188881A	2015-11-02
JP2008516768A	2008-05-22

Other References: