Title:
METHANE COMBUSTION CATALYST, PRODUCTION METHOD THEREFOR, AND COMBUSTION EXHAUST GAS CLEANING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/149319
Kind Code:
A1
Abstract:
The present invention relates to a methane combustion catalyst comprising platinum and iridium supported by a tin oxide support, the catalyst serving the purpose of combusting methane which is present in a combustion exhaust gas containing sulfur oxide. This methane combustion catalyst is such that, for an arbitrary cross-section, when a line analysis is performed by electron probe microanalysis in the direction from the deep-most portion of the catalyst to the surface of the catalyst, two regions are observable, which are a first region wherein platinum, iridium, and tin are all detected, and a second region wherein tin is unconditionally detected and no platinum is detected. In one concrete mode, this methane combustion catalyst is constituted from: a catalyst base layer comprising platinum and iridium supported by a tin oxide support; and an overcoat layer comprising tin oxide and formed over the catalyst base layer. This methane combustion catalyst has excellent initial activity and improved durability.
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Inventors:
TAKEDA KAZUTAKA (JP)
KATO SYUNSUKE (JP)
KIKUHARA SHUNJI (JP)
KATO SYUNSUKE (JP)
KIKUHARA SHUNJI (JP)
Application Number:
PCT/JP2021/036787
Publication Date:
July 14, 2022
Filing Date:
October 05, 2021
Export Citation:
Assignee:
TANAKA PRECIOUS METAL IND (JP)
International Classes:
B01J23/62; B01D53/94
Domestic Patent References:
| WO2019039513A1 | 2019-02-28 |
Foreign References:
| JP2006272079A | 2006-10-12 | |||
| JP2008246473A | 2008-10-16 | |||
| JP4283037B2 | 2009-06-24 | |||
| JP4429950B2 | 2010-03-10 |
Attorney, Agent or Firm:
TANAKA AND OKAZAKI (JP)
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