公开(公告)号：US20240058790A1

公开(公告)日：2024-02-22

申请号：US18271220

申请日：2021-10-05

申请人： TANAKA KIKINZOKU KOGYO K.K.

发明人： Kazutaka TAKEDA ,  Shunsuke KATO ,  Shunji KIKUHARA

IPC分类号： B01J23/62 ,  B01D53/94

CPC分类号： B01J23/626 ,  B01D53/94 ,  B01D2257/7025 ,  B01D2258/01

摘要： 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 this methane combustion catalyst, in line analysis by electron probe microanalysis performed on an arbitrary cross-section thereof from a deepest catalyst portion toward a catalyst surface, a first region where all of platinum, iridium and tin are detected and a second region where tin is essentially detected but platinum is not detected are both observable. In a specific form, the catalyst includes a base catalyst layer where platinum and iridium are supported on a tin oxide carrier, and an overcoat layer including tin oxide formed on the base catalyst layer. The methane combustion catalyst of the present invention is excellent in initial activity, and is improved in durability.

公开(公告)号：US20230173464A1

公开(公告)日：2023-06-08

申请号：US17923205

申请日：2021-05-06

申请人： TANAKA KIKINZOKU KOGYO K.K.

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

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

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

摘要： 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]