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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

Active Publication Date: 2021-09-03
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a catalyst for a gasoline engine exhaust particulate filter with low exhaust back pressure and a preparation method thereof, aiming at the disadvantage that the existing commercial gasoline engine exhaust particulate filter catalyst generally has relatively high back pressure. While ensuring particle filtration efficiency and catalytic performance, the exhaust back pressure is significantly lower than that of commercial catalysts

Method used

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

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Effect test

Embodiment 1

[0026] A wall-flow cordierite honeycomb ceramic carrier with a specification of Φ118.4mm*127mm, a mesh number of 300 mesh, a pore wall thickness of 203.2μm, a porosity of 65%, an average pore diameter of 20μm and a volume of 1.398L was selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 50 g / L. The distribution ratio of the catalytic coating on the inner wall of the carrier channel is 90%. The mass ratio of cerium-zirconium rare earth composite oxide to γ-alumina in the catalytic coating is 0.5:1. The composition of the cerium-zirconium rare earth composite oxide in the catalytic coating is 25% CeO by mass percentage 2 , 70% ZrO 2 , 2% La 2 o 3 and 3% Pr 6 o 11 . The loaded amount of noble Pd in ​​the catalytic coating is 0.1g / L; the loaded amount of Rh is 0.05g / L.

[0027] The preparation method of gasoline vehicle exhaust particulate matter filter catalyst, the steps are as follows:

[0028] (1) Add cerium-zir...

Embodiment 2

[0037] A wall-flow cordierite honeycomb ceramic carrier with a specification of Φ118.4mm*127mm, a mesh number of 300 mesh, a pore wall thickness of 203.2μm, a porosity of 65%, an average pore diameter of 20μm and a volume of 1.398L was selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 120 g / L. The distribution ratio of the catalytic coating on the inner wall of the carrier channel is 95%. The mass ratio of cerium-zirconium rare earth composite oxide and γ-alumina in the catalytic coating is 5:1. The composition of the cerium-zirconium rare earth composite oxide in the catalytic coating is 35% CeO by mass percentage 2 , 60% ZrO 2 , 2% La 2 o 3 and 3% Nd 2 o 3 . The loaded amount of noble Pd in ​​the catalytic coating is 1.5g / L; the loaded amount of Rh is 0.5g / L.

[0038] The preparation steps of the gasoline vehicle exhaust particulate matter filter catalyst are as follows:

[0039] (1) Add cerium-zirconium rar...

Embodiment 3

[0048] A wall-flow cordierite honeycomb ceramic carrier with a specification of Φ118.4mm*127mm, a mesh number of 300 mesh, a pore wall thickness of 203.2μm, a porosity of 65%, an average pore diameter of 20μm and a volume of 1.398L was selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 100 g / L. The distribution ratio of the catalytic coating on the inner wall of the carrier channel is 95%. The mass ratio of cerium-zirconium rare earth composite oxide to γ-alumina in the catalytic coating is 4:1. The composition of the cerium-zirconium rare earth composite oxide in the catalytic coating is 25% CeO by mass percentage 2 , 67% ZrO 2 , 3% La 2 o 3 and 5% of Y 2 o 2 . The loaded amount of noble Pd in ​​the catalytic coating is 1.5g / L; the loaded amount of Rh is 0.5g / L.

[0049] A method for preparing a catalyst for a gasoline vehicle exhaust particulate filter, comprising the following steps:

[0050] (1) Add cerium-...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J35/04B01J37/02B01D53/94
CPCB01D53/94B01J23/63B01J35/04B01J37/0217B01J37/0228
Inventor 孙亮潘其建岳军浦琦伟杨金王卫东贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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