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
View PDF5 Cites 6 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Weigh a certain amount of lanthanum nitrate, manganese nitrate and chloroplatinic acid according to the stoichiometric molar ratio. The content of chloroplatinic acid is calculated according to the Pt content of the final catalyst at 0.5%, and dissolved in deionized water to prepare a 0.5mol / L solution , Add 1.2 times the molar amount of citric acid to the solution and stir to dissolve, add a certain amount of dispersant, and stir in a water bath until the sol is reached; the resulting sol is placed at 120 oC Dry under the pressure, and finally calcined in the air to form 0.5% Pt-LaMnO 3 , The roasting temperature is 650 o C.

[0021] Catalyst evaluation method: Performance evaluation of soot catalytic oxidation was carried out in a stainless steel reaction tube with a fixed bed at normal pressure. The contact condition was loose contact, and the mass ratio of catalyst to soot was 9:1. O in feed gas 2 The content is 8%, NO is 500ppm, the rest is Ar, and t...

Example Embodiment

[0023] Example 2

[0024] LaMnO is prepared by the above sol-gel method 3 Composite oxide catalyst, the catalyst activity evaluation method is the same as that in Example 1, the obtained LaMnO 3 T of composite oxide catalyst 50 For 436 o C.

Example Embodiment

[0025] Example 3

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

[0027] The catalyst activity evaluation method is the same as in Example 1. The obtained CeO 2 / LaMnO 3 Catalyst T 50 For 410 o C.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap