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Particle oxidizing catalyst for diesel vehicle and preparation method of particle oxidizing catalyst

A particle oxidation and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high CO light-off temperature, unfavorable catalytic oxidation, active site occupation, etc. Anti-sintering ability, effect of promoting reaction

Active Publication Date: 2017-06-30
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the catalyst coating of diesel vehicles has a high CO light-off temperature, which will lead to HC species and NO-NO X The oxidation of CO will be worse, because at low temperature, the adsorption capacity of CO and noble metals is strong, and the active sites are occupied by CO. Only when the CO desorption reaction is completed, HC species and NO-NO 2 The reaction starts, the higher CO T 50 Will inhibit HC species and NO-NO 2 reaction, which is not conducive to the catalytic oxidation of some particles (SOF)

Method used

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  • Particle oxidizing catalyst for diesel vehicle and preparation method of particle oxidizing catalyst

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Embodiment 1

[0028] A preparation method of a particle oxidation catalyst for diesel vehicles, comprising the steps of:

[0029] (1) Weighing of materials: Weigh silicon-aluminum composite oxide, β-molecular sieve, CeO 2 , the total amount of powder is 980g, and the silicon-aluminum composite oxide and β-molecular sieve are mixed evenly;

[0030] (2) Weighing of precious metals: the total amount of precious metal Pt and precious metal Pd is 30g / ft 3 , the ratio of noble metal Pt to noble metal Pd is 1:1, the coating amount is 40g / L, the amount of noble metal Pt is calculated to be 13.243g, the amount of precious metal Pt solution weighed is 111.28g, and the amount of noble metal Pd is 13.243g , the amount of taking precious metal Pd solution is 90.62g;

[0031] (3) Loading of precious metals: the precious metal Pd(NO 3 ) 2 The solution was diluted with water to 144g, and the incipient wetness was impregnated in CeO 2 On, [Pt(NH 3 ) 4 ](OH) 2The solution was diluted with water to 67...

Embodiment 2

[0040] A preparation method of a particle oxidation catalyst for diesel vehicles, comprising the steps of:

[0041] (1) Weighing of materials: Weigh silicon-aluminum composite oxide, β-molecular sieve, and CeO at a weight ratio of 0.59:0.1:0.3 2 , the total amount of powder is 990g, and the silicon-aluminum composite oxide and β-molecular sieve are mixed evenly;

[0042] (2) Weighing of precious metals: the total amount of precious metal Pt and precious metal Pd is 10g / ft 3 , the ratio of noble metal Pt to noble metal Pd is 1:4, the coating amount is 20g / L, the amount of noble metal Pt is calculated to be 3.5315g, the amount of precious metal Pt solution weighed is 29.67g, and the amount of noble metal Pd is 14.1262g , the amount of taking the precious metal Pd solution is 96.67g;

[0043] (3) Loading of precious metals: the precious metal Pd(NO 3 ) 2 The solution was diluted with water to 216g, and the incipient wetness was impregnated in CeO 2 On, [Pt(NH 3 ) 4 ](OH) ...

Embodiment 3

[0052] A preparation method of a particle oxidation catalyst for diesel vehicles, comprising the steps of:

[0053] Precious Metal Loading Procedure

[0054] (1) Weighing of materials: Weigh silicon-aluminum composite oxide, β-molecular sieve, CeO respectively according to the weight ratio of 0.68:0.15:0.15 2 , the total amount of powder is 980g, and the silicon-aluminum composite oxide and β-molecular sieve are mixed evenly;

[0055] (2) Weighing of precious metals: the total amount of precious metal Pt and precious metal Pd is 20g / ft 3 , the ratio of noble metal Pt to noble metal Pd is 1:1, the coating amount is 30g / L, the amount of noble metal Pt is calculated to be 11.7g, the amount of precious metal Pt solution weighed is 98.3g, and the amount of noble metal Pd is 11.7g , the amount of taking precious metal Pd solution is 80.1g;

[0056] (3) Loading of precious metals: the precious metal Pd(NO 3 ) 2 The solution was diluted with water to 108g, and the incipient wetne...

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Abstract

The invention relates to a particle oxidizing catalyst for a diesel vehicle and a preparation method of the particle oxidizing catalyst. The particle oxidizing catalyst comprises a carrier, wherein the coating amount of a coating layer on the carrier is 10 to 40 g / L; the coating layer is prepared from silicon-aluminum composite oxide, rare earth CeO2, a beta-molecular sieve and a zirconia adhesive; the mass ratio of noble metal Pt and noble metal Pd in the coating layer is (1: 5) to (3: 1); the coating amounts of the noble metal Pt and the noble metal Pd are 5 to 90 g / ft<3>. The preparation method is simple, and steps are easy to operate; coating layer slurry is doped with silica alumina to prepare a dispersing agent, a rare earth material is used as a main material for particle oxidization, and the molecular sieve is a low temperature HC storage material, so that HC adsorption at low temperature is enhanced; the zirconia adhesive is added to carry the noble metals Pt and Pd. The prepared catalyst has lower CO initiation temperature; reduction of T50 of CO can effectively promote catalytic oxidation of the HC and NO-NO2 and reduce discharge of the HC; as NO2 is relatively high in oxidization capacity for particles at low temperature, relatively high NO2 ratio can promote the catalytic oxidation of the particles and realize relatively high durability.

Description

technical field [0001] The invention relates to a particle oxidation catalyst for diesel vehicles and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Compression-ignition diesel vehicles can run under lean burn conditions (high air-fuel ratio), so diesel vehicles have good fuel economy. Because of this, diesel vehicles have lower pollutant emissions (HC, CO), however, diesel vehicles will High NOx and particulate emissions are produced, and the particulate matter is mainly composed of soot particles (Soot), soluble organic compounds (SOF) and sulfates. Diesel vehicle particles are mainly composed of soot particles and SOF. SOF mainly comes from fuel and lubricating oil and exists in liquid or volatile form, depending on the exhaust temperature; Soot is mainly composed of carbon particles (dehydrocarbonization). The emission of these fine particles into the atmosphere poses certain risks to human health. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01D53/94B01D53/62B01D53/56B01D53/72
CPCB01D53/9445B01D2258/012B01J29/7415B01J2229/186B01J2229/20Y02A50/20
Inventor 杨金张元王刚郝士杰吕衍安岳军贾莉伟张辉俞红玲
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST