公开(公告)号：US20230173464A1

公开(公告)日：2023-06-08

申请号：US17923205

申请日：2021-05-06

Applicant: TANAKA KIKINZOKU KOGYO K.K.

Inventor： Kazutaka TAKEDA ,  Syunsuke KATO ,  Shunji KIKUHARA ,  Kanako KURAHASHI ,  Tatsushi MINAMI ,  Masahiro SHIRAKI

IPC: B01J23/46 ,  B01J23/42 ,  B01J23/14 ,  B01J37/02 ,  B01J37/08 ,  B01D53/86

CPC classification number: B01J23/468 ,  B01J23/42 ,  B01J23/14 ,  B01J37/0201 ,  B01J37/08 ,  B01D53/865 ,  B01D2257/7025 ,  B01D2258/01 ,  B01J2523/827 ,  B01J2523/828

Abstract: The present invention relates to a methane combustion catalyst including platinum and iridium supported on a tin oxide carrier for combusting methane in a combustion exhaust gas containing sulfur oxide. In the methane combustion catalyst, a ratio RTO of platinum oxides to metal platinum is 8.00 or more, wherein the ratio RTO is based on existence percentages of the metal platinum (Pt) and the platinum oxides (PtO and PtO2) obtained from a platinum 4f spectrum analyzed and measured by X-ray photoelectron spectroscopy (XPS) and calculated in accordance with the following expression. In the following expression, RPt is an existence percentage of the metal platinum (Pt), RPto is an existence percentage of PtO, and RPto2 is an existence percentage of PtO2.


RTO=(RPtO+RPtO2)/RPt  [Expression 1]