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Catalyst for lowering regeneration temperature of diesel particulate filter (DPF) and preparation method of catalyst

A technology for regenerating temperature and catalyst, which is applied in catalyst activation/preparation, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc. Low, easy-to-operate effects

Pending Publication Date: 2019-03-01
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through its unique wall-flow structure, the separation of PM and airflow in diesel engine exhaust and PM capture are realized. When DPF captures diesel exhaust particles to a certain extent, it needs to be actively regenerated to remove the particles at high temperature. When DPF When the internal carbon deposit is large and the exhaust volume is small, the large amount of heat released during particle regeneration cannot be discharged in time, and the carrier will burn, crack, etc., so active regeneration has certain risks

Method used

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  • Catalyst for lowering regeneration temperature of diesel particulate filter (DPF) and preparation method of catalyst
  • Catalyst for lowering regeneration temperature of diesel particulate filter (DPF) and preparation method of catalyst

Examples

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Effect test

Embodiment 1

[0030] A catalyst capable of lowering the regeneration temperature of DPF, the catalyst carrier is SiC, the volume is 3.3L, the pore density is 300 mesh / square foot; the coating contains γ-alumina, cerium oxide, magnesia, and γ-alumina and oxide The mass ratio of the mixture of cerium and magnesium oxide is 10:1; the coating amount of the coating is 5g / L; the precious metal is platinum, and the coating amount of the precious metal platinum is 0.1g / L.

[0031] A kind of preparation method of the catalyst that reduces DPF regeneration temperature, comprises the following steps:

[0032] (1) Preparation of coating slurry: Weigh 360g of γ-alumina and 36g of a mixture of cerium oxide and magnesia respectively, add deionized water to prepare an aqueous solution, and then make the mass ratio of γ-alumina and other oxides 10 Mix the two prepared aqueous solutions at a ratio of 1, and fully stir for 3 hours, and then further add additives to adjust the pH value;

[0033] (2) Slurry ba...

Embodiment 2

[0039] A catalyst capable of lowering the regeneration temperature of DPF. The catalyst carrier is SiC, with a volume of 3.3L and a pore density of 300 mesh / square foot; the coating contains γ-alumina, cerium-zirconium composite oxide, titanium oxide, and γ-oxidation The mass ratio of aluminum to cerium-zirconium composite oxide and titanium oxide mixture is 8:1; the coating amount is 20g / L; the precious metals are platinum and palladium, and the mass ratio of platinum and palladium is 1:1. Amount 1.1g / L.

[0040] A kind of preparation method of the catalyst that reduces DPF regeneration temperature, comprises the following steps:

[0041] (1) Preparation of coating slurry: Weigh 360g of γ-alumina and 45g of a mixture of cerium-zirconium composite oxide and titanium oxide respectively, add deionized water to prepare an aqueous solution, and then weigh 360g of γ-alumina and other oxides Mix the two prepared aqueous solutions at a ratio of 8:1, and stir them thoroughly for 3 ho...

Embodiment 3

[0048] A catalyst capable of reducing the regeneration temperature of DPF, the catalyst carrier is AT, the volume is 3.3L, and the pore density is 300 mesh / square foot; the coating contains γ-alumina and manganese oxide, and the mass of γ-alumina and manganese oxide The ratio is 6:1; the coating amount of the coating is 10g / L; the noble metals are platinum and palladium, the mass ratio of platinum and palladium is 15:1, and the coating amount of the noble metal is 0.3g / L;

[0049] A kind of preparation method of the catalyst that reduces DPF regeneration temperature, comprises the following steps:

[0050] (1) Preparation of coating slurry: Weigh 360g of γ-alumina and 60g of manganese oxide respectively, add deionized water to prepare an aqueous solution, and then mix γ-alumina and other oxides at a mass ratio of 6:1 The two prepared aqueous solutions were mixed and fully stirred for 3 hours, and then further additives were added to adjust the pH value;

[0051] (2) Slurry ba...

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Abstract

The invention relates to a catalyst for lowering the regeneration temperature of a diesel particulate filter (DPF) and a preparation method of the catalyst, and belongs to the technical field of catalyst preparation. The catalyst comprises a carrier and a coating layer on the carrier, wherein precious metal is loaded in the coating layer, the coating amount of the coating layer is 5-20g / L, and thecoating amount of the precious metal is 0.1-1.1g / L. When coating is carried out, one or more of gamma-aluminium oxide, Ce, Zr, Mg, Mn, La, Ti and oxides or composite oxides of the above materials aremade into precious-metal-free slurry, and the precious metal Pt and Pd are added into the precious-metal-free slurry to prepare the precious metal slurry. When coating is carried out, coating is carried out for one time from the gas outlet end of the DPF to the direction of the gas inlet end of the DPF. After drying is carried out, second coating is carried out from the gas inlet end of the DPF to the gas outlet end of the DPF. The catalyst has the characteristics of simple material and easy operation, and the prepared DPF has lower regeneration temperature and prolonged service life.

Description

technical field [0001] The invention relates to a catalyst for reducing the regeneration temperature of a DPF and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Diesel engines have the advantages of high thermal efficiency and wide power range, and are widely used in road vehicles, marine engines, and non-road machinery represented by generators. However, the particle size of the emitted particles is small, and the number of particles of 5-50nm accounts for more than 90%. They are light in weight, can be suspended in the atmosphere for a long time, and often attach carcinogens, causing great harm to human health. With the increasingly serious environmental protection situation, the problem of particulate (PM) emission from diesel engines has attracted enough attention, and the effective control of diesel engine particulates has become an extremely important and challenging topic in the current development...

Claims

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Application Information

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IPC IPC(8): B01J27/224B01J23/63B01J23/656B01J23/44B01J37/02F01N3/035
CPCB01J23/002B01J23/44B01J23/63B01J23/6562B01J27/224B01J37/0228B01J2523/00F01N3/035B01J2523/22B01J2523/31B01J2523/3712B01J2523/41B01J2523/47B01J2523/824B01J2523/828B01J2523/72B01J2523/48
Inventor 柯峰董铭鑫胡怡帆张元王刚郝士杰毛冰斌张席岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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