SiO2-containing denitration catalyst and preparation method thereof

A denitration catalyst and material preparation technology, which is applied in the field of denitration catalysts, can solve the problems of huge influence on SCR catalyst performance and high catalyst cost, achieve good chemical stability and thermal stability, reasonable preparation process design, and improve crystal transformation temperature and stability. sexual effect

Inactive Publication Date: 2013-02-13
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the molding commercial catalyst, various binders, extrusion aids and other additives account for about 10% of the total weight, but the composition, content and addition method of various binders and additives are technical secrets, and these conditions are fo...

Method used

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  • SiO2-containing denitration catalyst and preparation method thereof
  • SiO2-containing denitration catalyst and preparation method thereof
  • SiO2-containing denitration catalyst and preparation method thereof

Examples

Experimental program
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specific Embodiment

[0032] A kind of added SiO 2 The denitration catalyst, the mass percentage of each component in the denitration catalyst is as follows: V 2 o 5 1%~2%, WO 3 5%, SiO 2 5%~10%, the rest is TiO 2 . Specific examples are as follows:

[0033] (1) Examples 1-5 contain SiO for flue gas denitrification 2 The denitration catalyst, the mass percentage of each component in the denitration catalyst is as follows.

[0034] Example V 2 o 5 WO 3 SiO 2 TiO 2 Example 1 1 5 0 94 Example 2 1 5 5 89 Example 3 1 5 10 84 Example 4 1 5 20 74 Example 5 1 5 30 64

Embodiment 1

[0036] (1) Weigh 60g of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in a water bath at a temperature of 60°C, then dripped with ammonia water and stirred to dissolve, the pH value of the dissolved solution ranged from 10 to 11, and the resulting suspension was left to stand for 10 hours at a temperature of 40°C, filtered and washed. The obtained solid was dried at a temperature of 110°C for 10 hours, and finally placed in a muffle furnace for calcination at a temperature of 500°C for 2 hours, and finally cooled and then ground and sieved into 200 meshes.

[0037] (2) Weigh 0.274g of ammonium metavanadate and 1.131g of ammonium metatungstate, add a certain amount of oxalic acid, and stir in a water bath at a temperature of 60°C to fully dissolve the prepared TiO 2 -SiO 2 Immerse in the water bath solution, fully dissolve and stir evenly. Then the prepared solution was dried at 110° C. for 12 hours.

[0038] Oxalic acid (content≧99.5) is used as a cosolvent, and the dosage...

Embodiment 2

[0043] (1) Weigh 60g of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in a water bath at a temperature of 60°C. Add 4g of silica sol with a mass fraction of 25% and stir to mix evenly. Then add ammonia water and stir to dissolve. The pH value of the dissolved solution ranges from 10 to 11. Stand still at 40°C for 10 hours, filter and wash, and dry the obtained solid at 110°C for 10 hours, and finally place it in a muffle furnace and roast at 500°C for 2 hours, and finally grind it after cooling , and sieve into 200 mesh to get TiO 2 -SiO 2 Composite carrier.

[0044] (2) Weigh 0.287g ammonium metavanadate and 1.187g ammonium metatungstate, add a certain amount of oxalic acid, stir in a water bath at a temperature of 60°C to fully dissolve, and prepare the TiO 2 -SiO 2 Immerse in the water bath solution, fully dissolve and stir evenly. Then the prepared solution was dried at 110° C. for 12 hours.

[0045] (3) Roasting

[0046] The prepared sample evaporated to dryness w...

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Abstract

The invention belongs to the technical field of denitration catalysts and particularly relates to a SiO2-containing denitration catalyst and a preparation method thereof. The denitration catalyst comprises the following components in percentage by mass: 1 to 2 percent of V2O5, 5 percent of WO3, 5 to 10 percent of SiO2 and the balance of TiO2. The preparation method of the denitration catalyst comprises the following steps of: preparing a TiO2-SiO2composite carrier by a co-precipitation method; loading V2O5 and WO3 by a one-step impregnation method; and obtaining the catalyst with high low-temperature denitration by roasting. The method has the characteristics of increasing the overall mechanical strength, wear resistance, and other performance of the catalyst; the silica solution used as a cheap silicon source for SiO2 can be well improved in mechanical performance in processing, extruding and forming processes.

Description

technical field [0001] The invention belongs to the technical field of denitrification catalysts, and in particular relates to a method for adding SiO 2 Denitrification catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides NOx is one of the main air pollution, NOx includes NO, NO 2 , N 2 O, N 2 o 3 , and N 2 o 4 etc., mainly NO and NO 2 form exists. Coal-fired power plants are the main source of NOx emissions, and nearly 70% of my country's nitrogen oxides NOx emissions come from coal combustion. The emission of nitrogen oxides will cause environmental problems such as acid rain, greenhouse effect and ozone layer destruction, seriously endangering human health and social development. [0003] At present, the world's industrial application of denitrification technology is mainly divided into low NOx combustion technology, SNCR technology and SCR technology. Selective catalytic reduction (SCR) denitrification technology has a very hig...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 刘清才许志鹏吴国防杨强席文昌刘红辉魏丽斯杨剑刘浪袁鹏李琳周强孔明徐晶洪燕李云涛
Owner CHONGQING UNIV
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