Exhaust gas purifying catalyst

Abstract

The invention discloses an exhaust gas purifying catalyst. The catalyst comprises a carrier, an inorganic oxide, materials A, materials B and a cocatalyst; the carrier is in a honeycomb shape, the materials A comprise platinum group metal, alkali metal sulfate and neodymium oxide which are loaded on the carrier, and the materials B comprise at least one of transition metal oxides of Cu, Mn, Co, V,Mo and W, wherein the transition metal oxides are loaded on the carrier. Alkali metal sulfate independently exists in the materials A and can suppress deterioration caused by a reaction of the components of the catalyst, and therefore the exhaust gas purifying agent with high activity is obtained. Through the addition of neodymium oxide, the reduction of purification of CO, HC and NOx can be effectively suppressed. Compared with the prior art, the prepared catalyst can show the high catalytic activity under normal use conditions, the decrease of the catalytic activity can also be sufficientlysuppressed even when the catalyst is exposed in high-temperature exhaust gas for a long time, and the catalyst is suitable for mass preparation and has the possibility of industrial production and broad application prospects.

Description

technical field [0001] The present invention relates to an exhaust gas purification catalyst, and more particularly, to an exhaust gas purification catalyst having excellent high-temperature durability. Background technique [0002] In the prior art, there have been many different exhaust gas purification catalysts so far, which are mainly used to remove toxic components in the exhaust gas emitted by internal combustion engines such as automobiles, such as HC (hydrocarbons), CO and NO x . Most motor vehicles such as automobiles nowadays are equipped with three-way catalysts as catalysts for exhaust gas purification. As such exhaust gas purification catalysts, it is known that three-way catalysts simultaneously purify HC, CO and NO in the exhaust gas produced by combustion under the theoretical air-fuel ratio. x . Such an exhaust gas purification catalyst is generally composed of a substrate (supporting substrate), a carrier (layer for supporting the catalyst) and a catalys...

AI Technical Summary

Problems solved by technology

However, conventional exhaust gas purification catalysts have a problem in that if they are exposed to exhaust gas at a high temperature (especially 800° C. or higher) for a long period of time, particle growth (sintering) of the noble metal occurs, resulting in a loss of specific surface area. decreased, resulting in poor catalytic activity

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