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Mesoporous composite oxide catalyst for purifying tail gases and preparation method thereof

A composite oxide and tail gas purification technology, applied in the field of environmental catalytic purification, to achieve the effect of excellent low-temperature catalytic activity and wide reaction window

Inactive Publication Date: 2015-02-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the steps in the performance of existing catalysts for tail gas purification, and the invention provides a mesoporous composite oxide catalyst for tail gas purification and its preparation method

Method used

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  • Mesoporous composite oxide catalyst for purifying tail gases and preparation method thereof
  • Mesoporous composite oxide catalyst for purifying tail gases and preparation method thereof
  • Mesoporous composite oxide catalyst for purifying tail gases and preparation method thereof

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preparation example Construction

[0037] In addition, the present invention also provides a method for preparing a catalyst for purifying diesel vehicle exhaust, comprising the following steps:

[0038] ① Dissolve 4.5g of Brij-35, 3.7g of P123 and 1g of oxalic acid in 100mL of water, add vanadium salt, tungsten salt, copper salt and aluminum salt calculated according to the weight percentages of V, W, Cu, and Al into the prepared oxalic acid solution. 20-50℃ water bath heating and stirring for 2-6h;

[0039] ② Take 1.2ml of zirconium n-propoxide and 8.8ml of tetrabutyl titanate dropwise into 40ml of ethanol solution, and stir at room temperature for 1-5h;

[0040] ③ Add the solution prepared in step ② dropwise into the solution prepared in step ①, heat in a water bath at 20-50°C and stir for 6-12 hours;

[0041] ④ Transfer the mixture to a hydrothermal kettle, heat it with water at 100-150°C for 24 hours, then wash and filter and dry at 80-120°C;

[0042] ⑤ Place the dried catalyst powder in step ④ in a muff...

Embodiment 1

[0055] ① Dissolve 4.5g of Brij-35, 3.7g of P123 and 1g of oxalic acid in 100mL of water, and dissolve the ammonium metavanadate, ammonium metatungstate, copper sulfate pentahydrate, isopropanol calculated according to the weight percentages of V, W, Cu and Al. Aluminum was added to the prepared oxalic acid solution, heated in a 30°C water bath and stirred for 3h;

[0056] ② Take 1.2ml of zirconium n-propoxide and 8.8ml of tetrabutyl titanate dropwise into 40ml of ethanol solution, and stir at room temperature until a transparent solution is formed;

[0057] ③ Add the solution prepared in step ② dropwise into the solution prepared in step ①, heat in a 30°C water bath and stir for 12 hours until the mixture becomes a uniform emulsion;

[0058] ④ Transfer the mixture into a hydrothermal kettle, heat it with water at 120°C for 24h, then wash with ethanol, filter and dry at 100°C;

[0059] ⑤ Place the dried catalyst powder in step ④ in a muffle furnace, and calcinate at 500 ° C fo...

Embodiment 2

[0062] ① Dissolve 4.5g of Brij-35, 3.7g of P123 and 1g of oxalic acid in 100mL of water, add ammonium metavanadate, ammonium metatungstate and copper nitrate calculated according to the weight percentages of V, W and Cu into the prepared oxalic acid solution. Heated in a water bath at 30°C and stirred for 3h;

[0063] ② Take 1.2ml of zirconium n-propoxide and 8.8ml of tetrabutyl titanate dropwise into 40ml of ethanol solution, and stir at room temperature until a transparent solution is formed;

[0064] ③ Add the solution prepared in step ② dropwise into the solution prepared in step ①, heat in a 30°C water bath and stir for 12 hours until the mixture becomes a uniform emulsion;

[0065] ④ Transfer the mixture into a hydrothermal kettle, heat it with water at 120°C for 24h, then wash with ethanol, filter and dry at 100°C;

[0066] ⑤ Place the dried catalyst powder in step ④ in a muffle furnace, and calcinate at 500 ° C for 4 h to obtain V 2 O 5 -WO 3 -CuO x / ZrO 2 -TiO ...

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Abstract

The invention relates to a mesoporous composite oxide catalyst for purifying tail gases and a preparation method thereof. The composition chemical formula of the mesoporous composite oxide catalyst is V2O5- WO3-CuOx-Al2O3 / ZrO2-TiO2, wherein the ratio of the mass of V to the mass sum of ZrO2 and TiO2 is not larger than 10%, the ratio of the mass of W to the mass sum of ZrO2 and TiO2 is not larger than 20%, the ratio of the mass of Cu to the mass sum of ZrO2 and TiO2 is not larger than 10%, the ratio of the mass of Al to the mass sum of ZrO2 and TiO2 is not larger than 5%, and the value range of x is that x is not smaller than 0 and is not larger than 1.

Description

technical field [0001] The present invention relates to a kind of NH 3 -SCR catalyst and preparation method thereof, in particular to a composite oxide catalyst with crystallized mesoporous structure and preparation method thereof, belonging to the field of environmental catalytic purification. Background technique [0002] Diesel vehicles have been more and more widely used for their low fuel consumption and high power, but nitrogen oxides (NOx) from diesel vehicle exhaust are one of the main atmospheric pollutants that form nitric acid rain and photochemical smog and destroy the ozone layer. First, it has strong toxicity and brings serious harm to the natural environment and human production and life. Therefore, the elimination of nitrogen oxides has become an urgent problem in the current environmental protection field. [0003] At present, the selective catalytic reduction of ammonia (NH 3 -SCR) is considered to be NO under oxygen-enriched conditions x One of the mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/94B01D53/56
Inventor 陈英陈航榕施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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