公开(公告)号：US20160214088A1

公开(公告)日：2016-07-28

申请号：US15007477

申请日：2016-01-27

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY

Inventor： Shogo SHIRAKAWA ,  Hirohito HIRATA ,  Tatsuya MIYAZAKI ,  Megumi YANAGIDA ,  Tsukasa TORIMOTO

IPC: B01J23/652 ,  B01J37/02 ,  B01J37/34

CPC classification number: B01J23/6527 ,  B01D53/9404 ,  B01D2255/102 ,  B01D2255/2065 ,  B01D2255/20707 ,  B01D2255/20715 ,  B01D2255/20776 ,  B01D2255/2092 ,  B01D2255/30 ,  B01D2255/407 ,  B01J31/0277 ,  B01J31/0284 ,  B01J35/006 ,  B01J37/0018 ,  B01J37/0219 ,  B01J37/06 ,  B01J37/347

Abstract: The present invention relates to an exhaust gas purification catalyst that can homogeneously inhibit growth of a plurality of the fine particles at high temperature, and prevent lowering in catalytic activity, as well as a method for producing it. The exhaust gas purification catalyst of the present invention has fine composite metal particles containing a platinum-group metal and tungsten. Moreover, in the exhaust gas purification catalyst of the present invention, when the fine composite metal particles in the exhaust gas purification catalyst have been analyzed by STEM-EDX, the tungsten content of at least 80% of the fine composite metal particles based on number, is in the range of 10% to 350% of the mean content of tungsten in a plurality of the fine composite metal particles.

Abstract translation: 本发明涉及一种排气净化催化剂及其制造方法，其能够均匀地抑制高温下多种微粒的生长，并且能够防止催化活性的降低。 本发明的排气净化催化剂具有含有铂族金属和钨的复合金属微粒。 此外，在本发明的排气净化催化剂中，当通过STEM-EDX分析废气净化催化剂中的微细复合金属粒子时，基于数量的复合金属微粒的至少80％的钨含量 在多个复合金属微粒中的钨的平均含量的10〜350％的范围。