Method for preparing CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as cerium precursor

A technology of SCR catalyst and precursor, which is applied in the field of catalyst preparation, can solve the problems of limited application of MOF-based materials, achieve the effects of improved dispersion, simple process, and easy-to-obtain experimental raw materials

Active Publication Date: 2018-03-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far the application of MOF-based materials in the field of denitrification is still very limited.

Method used

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  • Method for preparing CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as cerium precursor
  • Method for preparing CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as cerium precursor
  • Method for preparing CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as cerium precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Weigh 29.4g of titanyl sulfate, dissolve it in 300ml of deionized water, stir for 4h, add the prepared Ce-MOF-112.4g, stir for 2h, slowly add ammonia water with a concentration of 25% to adjust the pH of the system to 10, continue stirring for 6h , stop stirring and let stand for 12h. Filter and dry the solid at 80°C for 12h, then put the dried powder into a muffle furnace and calcinate at 450°C for 2h in an air atmosphere to obtain 1# catalyst sample.

Embodiment 2

[0028] Weigh 29.4g of titanyl sulfate, dissolve it in 300ml of deionized water, stir for 4h, add the prepared Ce-MOF-112.4g, stir for 2h, slowly add ammonia water with a concentration of 25% to adjust the pH of the system to 11, continue stirring for 6h , stop stirring and let stand for 12h. Filter and dry the solid at 80°C for 12h, then put the dried powder into a muffle furnace and calcinate at 450°C for 2h in an air atmosphere to obtain 2# catalyst sample.

Embodiment 3

[0030] Weigh 29.4g of titanyl sulfate, dissolve it in 300ml of deionized water, stir for 4h, add the prepared Ce-MOF-112.4g, stir for 2h, slowly add ammonia water with a concentration of 25% to adjust the pH of the system to 10, continue stirring for 6h , stop stirring and let stand for 12h. Filter, dry the solid at 80°C for 12h, then put the dried powder into a muffle furnace, and calcinate at 550°C for 2h in an air atmosphere to obtain 3# catalyst sample.

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Abstract

The invention relates to a method for preparing a CeO2/TiO2 low-temperature SCR catalyst by using Ce-MOF as a cerium precursor, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: (1) weighing a fixed quantity of a cerium source and an organic ligand, dissolving the cerium source and the organic ligand in a proper amount of a solvent, and preparing a cerium-based metal organic framework material (Ce-MOF) by adopting a solvothermal method; (2) weighing and dissolving a fixed quantity of a soluble titanium source in a certain solvent,adding the Ce-MOF prepared in the step (1), and preparing a catalyst precursor by adopting a coprecipitation method; (3) putting the catalyst precursor obtained in the step (2) into a muffle furnacefor calcination treatment. Therefore, the CeO2/TiO2 low-temperature SCR catalyst prepared by using the Ce-MOF as a cerium precursor can be obtained. According to the preparation method provided by the invention, the preparation condition is easy to control, the preparation process is simple, and the prepared catalyst has excellent catalytic activity and good sulfur resistance and water resistancefor NH3-SCR reaction.

Description

technical field [0001] The invention relates to a CeO with Ce-MOF as the precursor of cerium 2 / TiO 2 The preparation method of the low-temperature SCR catalyst and its application in ammonia selective catalytic reduction of nitrogen oxides belong to the technical field of catalyst preparation. Background technique [0002] Nitrogen oxides (NO x ) is a common air pollutant, which is one of the main substances that form acid rain, and is also an important factor that forms harsh weather conditions such as photochemical smog and smog in the atmosphere, which has a bad impact on the ecological environment. Therefore, it is of great significance to research and develop efficient nitrogen oxide removal technology. Ammonia selective catalytic reduction (Selective Catalysis Reduction, NH 3 -SCR) is currently the most widely used flue gas denitration technology in industry, and its core lies in the development of SCR denitration catalyst. At present, vanadium-titanium base (V ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J37/08B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01J23/002B01J23/10B01J35/10B01J37/086B01J37/088Y02P20/30
Inventor 邱文革尹孟奇朱红太宋丽云何洪
Owner BEIJING UNIV OF TECH
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