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:
Jun. 23, 2015
Filed:
Mar. 14, 2007
Keisuke Tokunaga, Shunan, JP;
Hiroshi Ogawa, Shunan, JP;
Ko Ariga, Shunan, JP;
Hidekazu Aoyama, Shunan, JP;
Keisuke Tokunaga, Shunan, JP;
Hiroshi Ogawa, Shunan, JP;
Ko Ariga, Shunan, JP;
Hidekazu Aoyama, Shunan, JP;
TOSOH CORPORATION, Yamaguchi-Ken, JP;
Abstract
An SCR catalyst using a β-zeolite in which the molar ratio of SiO/AlOis from 20 to less than 40, the particle diameter determined by SEM is 0.35 μm or more, the full width at half maximum (FWHM) of the X-ray diffraction peak for (302) is less than 0.30°, and the amount of adsorbed NHis 1 mmol/g or more, or has an amount of adsorbed NHfollowing hydrothermal aging of 0.4 mmol/g or more, demonstrates high catalytic activity for NOx reduction at low temperatures following hydrothermal aging while also demonstrating a low level of discharge of irritating ammonia in exhaust gas.