The catalyst for emission gas purification

Japanese Patent JP6219871

B2

An object of the present invention is to provide an exhaust gas purification catalyst which can exhibit sufficient purification performance even under a high Ga condition. The present invention relates to an exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in the direction of an exhaust gas flow and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region. The downstream region in the direction of an exhaust gas flow has a structure where a void is included in a large number, and furthermore high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain percentage or more of the whole volume of voids. Thus, the exhaust gas purification catalyst exhibits enhanced purification performance.

Hiromasa Suzuki
Miura Masahide
Yoshinori Saito
Satoru Kato
Minoru Tanabe
Tetsuhiro Hirao
Tatsuya Ohashi
Hiroaki Naito
Hirotaka Kosato
Michihiko Takeuchi
Keiichi Narita

JP2015065504A

October 25, 2017

March 27, 2015

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TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota Central R & D Labs.
Cataler Co., Ltd.

B01J35/04; B01D53/94; B01J23/63; B01J35/10; B01J37/08; F01N3/28

JP2013180235A
JP2012240027A
JP2006314894A
JP2005296935A
JP2000246103A
JP2010528835A
JP2002079087A

WO2015037613A1

Yusuke Hiraki
Satoshi Fujita
Wakako Nomura

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