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:
Feb. 20, 2001
Filed:
Dec. 29, 1999
Toshihiro Takada, Toyota, JP;
Hiroaki Takahashi, Toyota, JP;
Masaru Ishii, Anjo, JP;
Saeko Kurachi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an exhaust gas in an oxygen-rich atmosphere, a method of purifying an exhaust gas and a catalyst for purifying an exhaust gas, which can exhibit a high NO,conversion securely, are provided. Disclosed is a method of purifying an exhaust gas that reduces and purifies NO,in an exhaust gas in an oxygen-rich atmosphere. Here, as a catalyst for purifying an exhaust gas, a loading layer comprising zeolite is loaded with alumina sulfate and cerium sulfate-zirconium composite oxide, and Pt is loaded on these. And, in a temperature range where HC are not oxidized, the HC are adsorbed and held by the zeolite, the HC, which the zeolite releases at the temperature increment, are subjected to cracking by the zeolite, the alumina sulfate and the cerium sulfate-zirconium composite oxide, and the thus produced low-grade HC are turned into reducing agents, thereby reducing and purifying the NO,in the exhaust gas.