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. 08, 2009
Filed:
Nov. 08, 2004
Tadao Nakatsuji, Kashiba, JP;
Norio Suzuki, Wako, JP;
Hiroshi Ohno, Wako, JP;
Naohiro Sato, Wako, JP;
Tomoko Morita, Wako, JP;
Katsuji Wada, Wako, JP;
Tadao Nakatsuji, Kashiba, JP;
Norio Suzuki, Wako, JP;
Hiroshi Ohno, Wako, JP;
Naohiro Sato, Wako, JP;
Tomoko Morita, Wako, JP;
Katsuji Wada, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
The invention provides a catalyst for catalytic reduction of nitrogen oxides contained in exhaust gases wherein fuel is supplied and subjected to combustion under periodic rich/lean conditions and the resulting exhaust gases are brought into contact therewith, which catalyst comprises: (A) a catalyst component A comprising (c) ceria or (d) praseodymium oxide or (e) an oxide and/or a composite oxide of at least two elements selected from the group consisting of cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum; (B) a catalyst component B comprising (d) a noble metal catalyst component selected from the group consisting of platinum, rhodium, palladium and oxides thereof and (e) a carrier; and (C) a catalyst component C comprising (f) a solid acid, and (g) a solid acid supporting an oxide of at least one element selected from the group consisting of vanadium, tungsten, molybdenum, copper, iron, cobalt, nickel and manganese.