Mazda Motor Corporation

Tokyo Roki Co., Ltd.

Kenji Ohkubo

Shigeru Sakurai

Yoshitaka Nomoto

Shigeru Yasaki

Yasutaka Yoshino

Hirofumi Yamauchi

Kazunori Ihara, Deceased

Hideaki Kurita

Kunihiro Yagi

In a method of manufacturing an exhaust gas purifying catalyst, a carrier of heat-resistant alloy steel containing aluminum is initially prepared as a metallic carrier. A first alumina slurry containing fine particles of hydrated alumina and water is then coated on the surface of the metallic carrier and is in turn dried and calcined so that a first alumina layer may be formed on the surface of the metallic carrier. Thereafter, a second alumina slurry containing gamma-alumina particles, hydrated alumina and water is coated on the surface of the first alumina layer and is in turn dried and calcined so that a second alumina layer may be formed on the surface of the first alumina layer.

Method of manufacturing an exhaust gas purifying catalyst

An internal combustion engine is provided in its exhaust system with a particulate filter for trapping combustible particulates contained in exhaust gas. A combustion promoting material injection device is provided for injecting a material for promoting combustion of the combustible particulates into the exhaust system upstream of the particulate filter. Further there are provided a bypass exhaust passage which bypasses the combustion promoting material injection device and the particulate filter, and a flow control valve which controls the amount of exhaust gas flowing through the bypass exhaust passage to control the amount of exhaust gas flowing into the particulate filter when said combustion promoting material is to be injected from the injecting device. When the combustion promoting material is injected, the flow control valve controls the amount of exhaust gas flowing into the particulate filter so that the combustion promoting material can uniformly adhere to the surface of the combustible particulates over the entire area thereof and so that the combustion temperature of the combustible particulates is prevented from rising abnormally high.

Exhaust gas cleaning system for vehicle

Growing community of inventors

Hiroshima, Japan

Kenji Ohkubo