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:
Jan. 27, 2015
Filed:
Oct. 28, 2009
Kinichi Iwachido, Aichi, JP;
Ken Tanabe, Okazaki, JP;
Takayuki Onodera, Toyota, JP;
Masanori Ide, Nagoya, JP;
Hiroaki Ohhara, Anjo, JP;
Mariko Ono, Himeji, JP;
Akihisa Okumura, Himeji, JP;
Masao Hori, Himeji, JP;
Kinichi Iwachido, Aichi, JP;
Ken Tanabe, Okazaki, JP;
Takayuki Onodera, Toyota, JP;
Masanori Ide, Nagoya, JP;
Hiroaki Ohhara, Anjo, JP;
Mariko Ono, Himeji, JP;
Akihisa Okumura, Himeji, JP;
Masao Hori, Himeji, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
ICT Co., Ltd., Osaka, JP;
Umicore Shokubai Japan Co., Ltd., Auburn Hills, MI (US);
Abstract
A method of purifying an exhaust gas, includes: disposing a NOx trapping catalyst in an exhaust pipe of an internal combustion engine, the NOx trapping catalyst including: a metal substrate including cells, a corner portion of each of cells having an acute angle; and a catalyst layer supported in the metal substrate and including a noble metal, a heat-resistant inorganic oxide and a NOx trapping material, the catalyst layer having pores formed by addition of a pore formation promoting material, and the NOx trapping catalyst: adsorbing NOx in the exhaust gas when an exhaust air-fuel ratio is in a lean state; and desorbing and reducing the adsorbed NOx when the exhaust air-fuel ratio is in a stoichiometric state or a rich state; and removing the NOx by the exhaust air-fuel ratio being shifted between the lean state and the rich state.