The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2022
Filed:
Aug. 23, 2018
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Abstract
An exhaust gas purifying catalyst () according to the present invention is an exhaust gas purifying catalyst including the first catalyst layer (). The first catalyst layer () includes the first section () and the second section () in the exhaust gas flow direction. The first section () is located on the upstream side in the exhaust gas flow direction relative to the second section (). A catalyst layer () contains a catalytically active component including a specific element. The concentration of the specific element in the catalyst layer () is higher in the first section () than in the second section (), in terms of mass per unit volume. When the first section is divided in half along the thickness direction of the first catalyst layer (), the ratio of ato a, a/a, is 1.1 or more, where arepresents the mass of the specific element that is present on the surface side of the catalyst layer () and arepresents the mass of the specific element that is present on the other side than the surface side of the catalyst layer.