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:
Sep. 22, 2015
Filed:
Aug. 25, 2010
Keisuke Tokunaga, Yamaguchi, JP;
Keisuke Tokunaga, Yamaguchi, JP;
TOSOH CORPORATION, Yamaguchi, JP;
Abstract
An SCR catalyst including iron-containing β-type zeolite has high NOreducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200° C.). A high NOreduction rate of at least 45% at a temperature not higher than 200° C. is achieved by an SCR catalyst containing iron-containing β-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction () plane of from 0.28 to 0.34° and a weight loss on heating to 900° C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing β-type zeolite at 700 to 850° C. under an atmosphere of a water vapor concentration of not more than 5% by volume.