Composite oxide catalyst for catalytic combustion of soot in diesel engine exhaust, and preparation method of catalyst

A composite oxide and soot combustion technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high cost and limited precious metal resources, etc. Achieve the effects of reducing preparation cost, simplifying the preparation process, and being easy to operate

Active Publication Date: 2014-08-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, noble metal catalysts (such as Pt) are currently the most active catalysts[ Appl. Catal. B , 1998, 18, 183-188], but precious metal resources are limited and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a certain amount of lanthanum nitrate, manganese nitrate and chloroplatinic acid according to the stoichiometric molar ratio, and the content of chloroplatinic acid is calculated as 0.5% according to the Pt content in the final catalyst, and it is dissolved in deionized water to form a 0.5mol / L solution , add citric acid with 1.2 times the molar weight of metal ions into the solution and stir to dissolve, add a certain amount of dispersant, and stir in a water bath until the sol; the obtained sol is placed in 120 oC Drying under air, and finally roasting in air to form 0.5%Pt-LaMnO 3 , the firing temperature is 650 o c.

[0021] Catalyst evaluation method: soot catalytic oxidation was performed in a fixed-bed stainless steel reaction tube at atmospheric pressure for performance evaluation, the contact condition was loose contact, and the mass ratio of catalyst to soot was 9:1. O in raw gas 2 The content is 8%, NO is 500ppm, the rest is Ar, and the gas flow rate...

Embodiment 2

[0024] LaMnO was prepared by the above-mentioned sol-gel method 3 Composite oxide catalyst, catalyst activity evaluation method is the same as embodiment 1, gained LaMnO 3 T of composite oxide catalyst 50 for 436 o c.

Embodiment 3

[0026] LaMnO was prepared by the above-mentioned sol-gel method 3 Composite oxides, after pretreatment, prepared CeO by impregnation 2 / LaMnO 3 , where CeO 2 The weight of LaMnO 3 20% of. Using cerium ammonium nitrate as the precursor salt of Ce, adding an organic solvent as a diffusing agent, adding the prepared LaMnO 3 , after stirring for 2~5 hours, let it stand for 12 h, then dry, at 500 o C roasting.

[0027] Catalyst activity evaluation method is the same as embodiment 1, gained CeO 2 / LaMnO 3 Catalyst T 50 for 410 o c.

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Abstract

The invention relates to a composite oxide catalyst for catalytic combustion of soot particles in diesel engine exhaust. The composite oxide catalyst has the following composition: Ce2O2-MOx / Lax' A(1-x)' Mny B(1-y) O3, wherein M is one or more in Zr, Pr, Sm or Y, A is one or more in K, Ca, Ba or Sr, and B is one or more in Cr, Fe, Co or Ni. The soot combustion catalyst has good performance of removing soot in a catalytic way, and is low in cost, simple in preparation process and easy in industrial application.

Description

technical field [0001] The invention relates to a composite oxide catalyst used for catalytic combustion of soot in diesel engine tail gas, which is mainly used for low-temperature catalytic elimination of soot particles in diesel engine tail gas. Background technique [0002] The soot particles emitted by diesel engine exhaust have a small particle size, which can not only enter the lungs of the human body with breathing, causing respiratory diseases, but also be suspended in the atmosphere, which is one of the main pollutants that cause smog. The use of particulate matter filter (DPF) is currently the most efficient exhaust gas treatment product for controlling PM emissions from diesel vehicles, and the capture efficiency of PM can reach more than 90%. Because the exhaust temperature of diesel engine exhaust is lower than the combustion / oxidation temperature of soot particles, the soot particles accumulated in the DPF cannot be directly oxidized or burned. When the PM in ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889F01N3/10
Inventor 郭耘徐建忠王丽卢冠忠郭杨龙詹望成王艳芹王筠松刘晓晖龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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