| 摘要 |
PURPOSE: To form a catalyst for purifying diesel-engine exhaust gas by providing a layer of a vanadium compound on a carrier such as aluminum oxide in a fine particle and further supporting platinum group metals as active components on the layer. CONSTITUTION: This catalyst for purifying diesel-engine exhaust gas is formed by providing a layer composed of a vanadium compound being an actively promoting material on a carrier which is comprised of fine particulate alumina, titanium oxide, silica, zeolite or a mixture thereof and then, supporting a platinum group metal consisting of platinum, palladium, rhodium and iridium being catalyst active components on the layer composed of the vanadium compound. The catalyst has the ability to convert hydrocarbons and carbon monoxide contained in the exhaust gas with a high conversion ratio at a low temp. and shows reduced oxidative action against NO and SO2 . |
