Catalyst for GPF (gasoline particulate filter) and preparation method of catalyst

A particle trap, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of low exhaust back pressure and high exhaust back pressure, and achieve back pressure The effect of reducing, improving rheology and inhibiting high temperature sintering process

Active Publication Date: 2018-07-20
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gasoline vehicle particulate filter catalyst and a preparation method thereof in order to solve the problem of high exhaust back press...

Method used

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  • Catalyst for GPF (gasoline particulate filter) and preparation method of catalyst
  • Catalyst for GPF (gasoline particulate filter) and preparation method of catalyst
  • Catalyst for GPF (gasoline particulate filter) and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A wall-flow 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.

[0031] First coat the first coating 2 on one end of the carrier 1, the coating amount of the first coating 2 is 60g / L, the height of the coating along the axial direction is 90% of the height of the carrier, and the loading amount of Rh is 3g / ft 3 . The other end of the carrier 1 is coated with the second coating 3, the coating amount of the second coating 3 is 60g / L, the height of the coating along the axial direction is 90% of the height of the carrier 1, and the loading of Pd is 4g / L. ft 3 .

[0032] The components in the cerium-zirconium rare earth composite oxide used in the coating are calculated by mass percentage: 20% CeO 2 , 75% ZrO 2 , 1% La 2 o 3 and 4% Pr 6 o 11 . The components in the lanthanum-aluminum composite oxide use...

Embodiment 2

[0045] A wall-flow honeycomb ceramic carrier 1 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. First coat the first coating 2 at one end of the carrier 1, the coating amount of the first coating 2 is 30g / L, the height of the coating along the axial direction is 50% of the height of the carrier 1, and the loading of Rh is 10g / L. ft 3 . Coating the second coating 3 on the other end of the support, the coating amount of the second coating 3 is 30g / L, the height of the coating along the axial direction is 50% of the height of the support, and the loading of Pd is 20g / ft 3 .

[0046] The composition of the cerium-zirconium rare earth composite oxide used in the coating is calculated by mass percentage: 30% CeO 2 , 65% ZrO 2 , 2% La 2 o 3 and 3% Nd 2 o 3 . The components in the lanthanum-aluminum composite oxide used in the coating ar...

Embodiment 3

[0059] A wall-flow honeycomb ceramic carrier 1 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. First coat the first coating 2 on one end of the carrier 1, the coating amount of the first coating 2 is 50g / L, the height of the coating along the axial direction is 75% of the height of the carrier 1, and the loading of Rh is 6g / L. ft 3 . Coating the second coating 3 on the other end of the carrier 1, the coating amount of the second coating 3 is 50g / L, the height of the coating along the axial direction is 75% of the height of the carrier, and the loading amount of Pd is 8g / ft 3 .

[0060] The composition of the cerium-zirconium rare earth composite oxide used in the coating is calculated by mass percentage: 25% CeO 2 , 68% ZrO 2 , 1% La 2 o 3 and 6% of Y 2 o 2 . The components in the lanthanum-aluminum composite oxide used in the c...

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Abstract

The invention relates to a catalyst for a GPF (gasoline particulate filter) and a preparation method of the catalyst, and belongs to the technical field of catalyst preparation. Wall-flow cordierite honeycomb ceramic is taken as a support, pore channel walls inside a gas inlet end and a gas outlet end of the support are coated with a first coating and a second coating respectively, the first coating contains a Ce-Zr rare earth composite oxide and an La-Al composite oxide, and the second coating contains a Ce-Zr rare earth composite oxide, an La-Al composite oxide and an alkaline earth metal oxide. Coating quantities of the first coating and the second coating are 30-60 g/L, and axial height of each coating is 50%-90% of the support height. Precious metals Rh and Pd are supported on the first coating and the second coating respectively. The preparation method is simple and easy to operate. Exhaust back pressure of the catalyst is reduced remarkably by means of a coating regulator, dispersibility of the coatings is improved, the catalyst still keeps higher particulate filter efficiency and gaseous pollutant removal rate while the exhaust back pressure is reduced, besides, thermal stability of the precious metal Pd is improved by the alkaline earth metal oxide, and thermal ageing resistance of the catalyst is improved.

Description

technical field [0001] The invention relates to a catalyst for a gasoline vehicle particle trap and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Among the gasoline engine technologies that are constantly being reformed and developed, in-cylinder direct injection is the hottest. Gasoline direct injection (GDI) is a development direction of traditional gasoline engines. Advanced direct injection gasoline engines use fuel supply technology similar to diesel engines, which greatly improves the combustion efficiency of the engine and improves the power of the engine. Compared with traditional port injection gasoline engines, in-cylinder direct injection gasoline engines are gaining more and more market share due to their excellent fuel economy and power performance. At the same time, direct injection gasoline engine can reduce CO 2 emissions, with emission regulations for CO 2 The requirements are more st...

Claims

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Application Information

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IPC IPC(8): B01J23/63F01N3/28
CPCB01J23/002B01J23/63B01J2523/00F01N3/2828B01J2523/3706B01J2523/3712B01J2523/3718B01J2523/48B01J2523/822B01J2523/824B01J2523/3725B01J2523/36
Inventor 孙亮岳军赵九洲浦琦伟蔡晓江郝士杰潘丞烨毛冰斌王卫东王刚贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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