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

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 method for removing diesel engine NO X The catalyst, is characterized in that, described catalyst is multi-element metal oxide, comprises carrier component: TiO 2 , the main active component: CeO 2 , CuO, co-catalyst component: WO 3 ; The mass percent of each component is respectively: TiO 2 55%~65%, CeO 2 23%~28%, CuO 3%~5%, WO 3 10% to 13%, the sum of the mass percentages is 100%; the catalyst can be used for wide temperature window NH 3 In the catalytic process of SCR, the multi-element metal oxide catalyst of the present invention has a wide active temperature window, especially in the low temperature condition of diesel engine exhaust temperature (100-250°C), which improves the removal efficiency of NOx by NH3-SCR , so as to use the multi-component catalyst to achieve the purpose of greatly reducing NOx in the wide temperature window of diesel engine exhaust at 100-450 ° C, which is especially suitable for the traffic conditions of urban roads in my country.

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
CPCB01J23/002B01J23/888B01J35/1014B01J35/1019
Inventor 林赫管斌王哲黄震
Owner SHANGHAI JIAO TONG UNIV
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