Nissan Motor Company Limited

Fumihiro Uchikawa

Yoshiaki Hiramoto

Haruhiko Shibayama

Keita Manyu

Toru Sekiba

Akihide Okada

In the present invention, slurry is formed by mixing noble metal-supported powder particles () and a binder () with each other in a liquid (Step S), and the noble metal-supported powder particles () are dispersed by applying vibrations to the slurry (Step S), and thereafter, the slurry is spray dried while keeping a state where the noble metal-supported powder particles () are dispersed (Step S), whereby noble metal-supported powder () is produced. In the noble metal-supported powder () produced by such a method, pores through which exhaust gas flows are formed appropriately, and accordingly, exhaust gas purification performance can be enhanced.

Method of producing noble metal-supported powder, noble metal-supported powder and exhaust gas purifying catalyst

A catalyst for the purification of exhaust gas comprises a combination of palladium carried on cerium oxide and palladium carried on alumina, or further rhodium carried on alumina, in which a weight ratio of palladium carried on cerium oxide to palladium carried on alumina is 2:8-8:2. Preferably, the cerium oxide contains at least one of zirconium, lanthanum, neodymium and praseodymium, or the alumina contains at least one of zirconium, lanthanum, neodymium, cerium, strontium and barium. This catalyst develops excellent purification performances against exhaust gas of oxidizing atmosphere to reducing atmosphere.

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Yokohama, Japan

Fumihiro Uchikawa