GPF quaternary catalyst and preparation method thereof

Abstract

The invention discloses a GPF quaternary catalyst and a preparation method thereof. The GPF quaternary catalyst comprises a GPF carrier and a catalyst coating layer, wherein the wall surface of a portof the gas feeding end of the GPF carrier is coated with the catalyst coating layer, and the catalyst coating layer is prepared from the following components in percentage based on the total mass ofoxide: 0 to 13 percent of catalyst-assisted metal oxide, 30 to 60 percent of activated aluminum oxide, 30 to 60 percent of rare earth-transitional metal composite oxide, 0 to 3 percent of active components and the balance of an adhesive; the active components comprise a first noble metal and Rh oxide; the first noble metal is selected from Pd or Pt; the catalyst coating layer is formed by coatingslurry obtained by mixing first noble metal powder, which is obtained by loading the first noble metal on the activated aluminum oxide and the rare earth-transitional metal composite oxide, with Rh catalyst powder, which is obtained by loading Rh on the activated aluminum oxide and the rare earth-transitional metal composite oxide; the coating amount is 30 to 70 g / L; the mass ratio of the active components is first noble metal:Rh=(1 to 1.5):1; the first noble metal content is 4 to 20 g / ft<3>, and the Rh content is 3 to 15 g / ft<3>. According to the GPF quaternary catalyst and the preparation method thereof, efficient purification of CO, HC, NOx and particulate matters can be realized on the premise of not blocking a GPF ceramic hole and reducing the back pressure of the catalyst, so that quaternary catalysis is realized.

Description

technical field [0001] The invention relates to the field of automobile exhaust emissions, in particular to a GPF catalyst and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the automobile industry, it has brought convenience to people's life, but also caused serious damage to the ecological environment. Pollutants emitted by motor vehicles mainly include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter. In order to limit the pollution caused by automobile exhaust to the environment, the country has issued a series of regulations to regulate its emission limits. [0003] With the release of "GB18352.6-2016 Light-duty Vehicle Pollutant Emission Limits and Measurement Methods" (China's sixth stage), from July 1, 2020, the National VI standard will be fully implemented. Compared with the National V standard of "GB18352.5-2013 Light Vehicle Pollutant Emission Limits and Measuremen...

AI Technical Summary

Problems solved by technology

Although their research on GPF supports has gradually entered a mature stage, there is still little research on GPF catalysts.

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