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Catalyst for removing NOx of diesel engine and preparation method thereof

A catalyst and diesel engine technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unfavorable human health and environmental friendliness, so as to improve the reaction rate and NOx removal efficiency, improve and The effect of stabilizing catalyst performance, high activity and stability

Inactive Publication Date: 2016-10-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the toxicity of vanadium-containing substances, they will volatilize at high temperatures, which is not conducive to human health and environmental friendliness. The present invention is devoted to the research of metal oxide catalysts used to replace vanadium-based catalysts

Method used

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  • Catalyst for removing NOx of diesel engine and preparation method thereof
  • Catalyst for removing NOx of diesel engine and preparation method thereof
  • Catalyst for removing NOx of diesel engine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Carry out alcoholysis, hydrolysis and concentrated nitric acid dissolution of tetra-n-butyl titanate to generate TiO(NO 3 ) 2 Solution, weigh 5.105g of tetra-n-butyl titanate, carry out alcoholysis and hydrolysis successively. First measure 10ml of absolute ethanol for titration and stirring, then measure 12ml of deionized water for titration and stirring to obtain a white flocculent precipitate. Finally, 9ml of concentrated nitric acid was added to dissolve the precipitate to obtain TiO(NO 3 ) 2 Clear solution.

[0041] (2)TiO 2 Determination of carrier, metal oxide main active component and co-catalyst loading

[0042] According to TiO 2 : CeO 2 :CuO:WO 3 = 1: 0.431: 0.0664: 0.1935 mass ratio to calculate the dosage of each component of the catalyst are: tetra-n-butyl titanate 5.105g, cerium nitrate hexahydrate 1.303g, copper nitrate trihydrate 0.242g, ammonium tungstate 3.043g .

[0043] (3) TiO 2 Carrier components, CeO 2 with CuO main active compone...

Embodiment 2

[0046] (1) Carry out alcoholysis, hydrolysis and concentrated nitric acid dissolution of tetra-n-butyl titanate to generate TiO(NO 3 ) 2 the solution

[0047] Weigh 2.552 g of tetra-n-butyl titanate, and carry out alcoholysis and hydrolysis successively. First measure 8ml of absolute ethanol for titration and stirring, then measure 8ml of deionized water for titration and stirring to obtain a white flocculent precipitate. Finally, 6ml of concentrated nitric acid was added to dissolve the precipitate to obtain TiO(NO 3 ) 2 Clear solution.

[0048] (2)TiO 2 Determination of carrier, metal oxide main active component and co-catalyst loading

[0049] According to TiO 2 : CeO 2 :CuO:WO 3 = 1: 0.431: 0.0664: 0.1935 mass ratio to calculate the dosage of each component of the catalyst are: tetra-n-butyl titanate 2.552g, cerium nitrate hexahydrate 0.651g, copper nitrate trihydrate 0.121g, ammonium tungstate 1.521g .

[0050] (3) TiO 2 Carrier components, CeO 2 with CuO mai...

Embodiment 3

[0053] (1) Carry out alcoholysis, hydrolysis and concentrated nitric acid dissolution of tetra-n-butyl titanate to generate TiO(NO 3 ) 2 the solution

[0054]Weigh 17.866g of tetra-n-butyl titanate, and carry out alcoholysis and hydrolysis successively. First measure 38ml of absolute ethanol for titration and stirring, then measure 40ml of deionized water for titration and stirring to obtain a white flocculent precipitate. Finally, 35ml of concentrated nitric acid was added to dissolve the precipitate to obtain TiO(NO 3 ) 2 Clear solution.

[0055] (2)TiO 2 Determination of carrier, metal oxide main active component and co-catalyst loading

[0056] According to TiO 2 : CeO 2 :CuO:WO 3 = 1: 0.431: 0.0664: 0.1935 mass ratio to calculate the dosage of each component of the catalyst are: tetra-n-butyl titanate 17.866g, cerium nitrate hexahydrate 4.559g, copper nitrate trihydrate 0.846g, ammonium tungstate 10.649g .

[0057] (3) TiO 2 Carrier components, CeO 2 with CuO...

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Abstract

The invention discloses a catalyst for removing NOx of a diesel engine. The catalyst for removing the NOx of the diesel engine is characterized in that the catalyst is a multi-element metal oxide, and comprises TiO2 which serves as a carrier component, CeO2 and CuO which serve as main active ingredients, and WO3 which serves as a catalyst promoter component; the mass percentage of various components are respectively as follows: 55 to 65 percent of TiO2, 23 to 28 percent of CeO2, 3 to 5 percent of CuO, and 10 to 13 percent of WO3, and the sum of the mass percentage is 100 percent; the catalyst can be used in a catalysis process of NH3-SCR in a wide temperature window; the multi-element metal oxide catalyst provided by the invention has a relatively wide active temperature window, and particularly the removal efficiency of the NH3-SCR to NOx is improved under the working conditions of low exhaust temperature (100 to 250 DEG C) of the diesel engine, so that the purpose of greatly reducing the NOx in a wide exhaust temperature window of the diesel engine at 100 to 450 DEG C is achieved; therefore, the catalyst is particularly suitable for the traffic conditions of urban roads of China.

Description

technical field [0001] The invention relates to the field of diesel engine tail gas catalysis, in particular to a method for removing NO from diesel engines X Catalysts and their preparation methods. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants. At present, the relatively mature and widely used post-combustion treatment technology for NOx removal is Selective Catalytic Reduction (SCR) technology, which was first applied to denitrification on stationary sources (power plants, boilers, etc.), and is now gradually being used on mobile sources (heavy-duty diesel vehicles) , ships, etc.) The principle of SCR technology is to use ammonia (NH3) as a reducing agent to catalyze the reduction of nitrogen oxides into clean nitrogen. [0003] Urea-selective catalytic reduction technology (Urea-SCR) is considered to be the best solution for diesel vehicle NOx emissions to meet Euro V or even higher emission standards. Urea-SCR is essentially ...

Claims

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Application Information

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IPC IPC(8): B01J23/888
CPCB01J23/002B01J23/888B01J35/613B01J35/615
Inventor 林赫管斌王哲黄震
Owner SHANGHAI JIAO TONG UNIV
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