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Title:
THREE-WAY CATALYST FOR EXHAUST GAS PURIFICATION USE
Document Type and Number:
WIPO Patent Application WO/2019/163435
Kind Code:
A1
Abstract:
Provided are: a three-way catalyst for exhaust gas purification use, which is reduced in the amount of a platinum-group element to be used, can be heated promptly to a catalyst-active temperature, is rarely deteriorated in the performance thereof due to the presence of a catalysis poison contained in exhaust gas when the three-way catalyst is placed immediately below an engine, and has excellent purification performance; and others. A three-way catalyst for exhaust gas purification use, which is provided with at least a catalyst support 11 and a catalyst layer 21, wherein the catalyst layer 21 has a laminate structure having at least a first catalyst layer L1, a second catalyst layer L2 and a third catalyst layer L3 in this order, the first catalyst layer L1 contains first composite catalyst particles in each of which palladium is supported on a first matrix particle, the second catalyst layer L2 contains second composite catalyst particles in each of which rhodium is supported on a second matrix particle, the third catalyst layer L3 contains third composite catalyst particles in each of which palladium is supported on a third matrix particle, and the sum total Wt of the coating amounts of the catalyst layers L1, L2 and L3 (wherein the amount of a platinum-group element contained in each of the catalyst layers is excluded) is 110 to 225 g/L inclusive per volume of the catalyst support 11.

Inventors:
ONUKI, Toshinori (4-1 Hamamatsucho 2-chome, Minato-k, Tokyo 24, 〒1056124, JP)
TAKAHASHI, Yoshinori (4-1 Hamamatsucho 2-chome, Minato-k, Tokyo 24, 〒1056124, JP)
Application Number:
JP2019/002773
Publication Date:
August 29, 2019
Filing Date:
January 28, 2019
Export Citation:
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Assignee:
N.E. CHEMCAT CORPORATION (4-1 Hamamatsucho 2-chome, Minato-ku Tokyo, 24, 〒1056124, JP)
International Classes:
B01J35/04; B01D53/94; B01J27/053; B01J37/02; F01N3/10
Domestic Patent References:
WO2017222017A12017-12-28
Foreign References:
JP2010501337A2010-01-21
US20090175773A12009-07-09
JP2015073943A2015-04-20
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (TMI ASSOCIATES, 23rd Floor Roppongi Hills Mori Tower, 6-10-1, Roppongi, Minato-k, Tokyo 23, 〒1066123, JP)
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