Catalyst for gasoline engine exhaust particulate matter filter and preparation method thereof

A technology of exhaust particles and filters, which is applied in the field of gasoline engine exhaust particulate filter catalysts and its preparation, can solve the problems of exhaust back pressure drop and high back pressure, and achieve the effect of reducing exhaust back pressure

CN109621952BActive Publication Date: 2021-09-03WUXI WEIFU ENVIRONMENT PROTECTION CATALYST

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
Publication Date: 2021-09-03

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Abstract

The invention relates to a gasoline engine exhaust particle filter catalyst and a preparation method thereof. The height of the direction is 100% of the height of the carrier. The catalytic coating contains cerium-zirconium rare earth composite oxide, γ-alumina and noble metal active components. The noble metal active components include Pd and Rh, and the loading of Pd is 0.1~1.5 g / L; the loading of Rh is 0.05~0.5 g / L. The invention realizes the uniform diffusion and distribution of the catalytic coating on the inner wall structure of the pore channel through the improvement of the coating process of the catalytic coating, thereby significantly reducing the exhaust back pressure of the particulate matter filter catalyst, and meanwhile the uniformly distributed catalytic coating is very good It plays the role of intercepting particulate matter and transforming gaseous pollutants, so that the filter catalyst prepared by the invention does not negatively affect the particle collection rate and catalytic performance while reducing the exhaust back pressure.

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Description

technical field

[0001] The invention relates to a gasoline engine tail gas particle filter catalyst and a preparation method thereof, belonging to the technical field of tail gas post-treatment. Background technique

[0002] The National VI emission standard for light-duty vehicles will be implemented on July 1, 2020. This standard has strict regulations on the number of gasoline vehicle exhaust particles: in the WLTC test cycle, the particle number (PN) emission cannot exceed 6.0×1011 / km. At present, turbocharging and in-cylinder direct injection (GDI) technologies commonly used in domestic gasoline vehicle engines not only bring about improvements in combustion efficiency and power, but also increase the number of particulate matter emissions. With the imminent implementation of the National VI regulations, many OEMs choose to install gasoline engine exhaust particulate filter (GPF) catalysts to meet the PN emission requirements of the National VI regulations.

[0003] ...

Claims

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