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Co-precipitation preparation method of composite oxide denitration catalyst

A denitration catalyst and composite oxide technology, which is applied in the field of nitrogen oxide reduction catalyst preparation, can solve the problems of low NOx removal rate and inapplicability, and achieve the effects of increasing specific surface area, improving denitration activity and reducing cost.

Inactive Publication Date: 2014-05-21
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is prepared by a one-step co-precipitation method, it is not a selective catalytic reduction to remove nitrogen oxides, but an adsorption method. This method has a low removal rate of NOx and is not suitable for high-content NOx flue gas.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) Preparation of catalyst precursor Preparation: Weigh 166.0g of NaSiO under constant temperature conditions of 60-100°C 3 9H 2 O, 112.0gTiCl 4 , 83.0gAlCl 3 ·6H 2 O and 3.0g ammonium metavanadate, 5.1g ammonium tungstate, 30.0g chromium nitrate, 13.6g nickel nitrate, 5.1g manganese chloride.

[0020] Then add water or hydrogen peroxide respectively to make NaSiO 3 9H 2 O, titanium sulfate aqueous solution, AlCl 3 ·6H 2 O aqueous solution, ammonium vanadate hydrogen peroxide aqueous solution, ammonium tungstate aqueous solution, nickel nitrate aqueous solution, cobalt nitrate aqueous solution, chromium nitrate aqueous solution and manganese chloride aqueous solution.

[0021] Mix the above solutions, add dropwise sodium silicate nonahydrate aqueous solution under stirring condition, after dark green uniform precipitation appears, use H 2 SO 4 Aqueous solution or NH 3 ·H 2 O to adjust the pH of the precipitation system to 8-9, after stirring, let it stand for...

Embodiment 2

[0025] Prepared in the same manner as in Example 1. The difference is: weigh 249.0gNaSiO 3 9H 2 O, 98.0gTiCl 4 , 27.7gAlCl 3 ·6H 2O and 3.0g ammonium metavanadate, 5.1g ammonium tungstate, 30.0g chromium nitrate, 8.2g cobalt nitrate.

[0026] Analysis of TiO in prepared catalyst 2 The content is 35%wt%, SiO 2 45%wt%, Al 2 o 3 5%wt%, V 2 o 5 2%wt%, WO 3 4%wt%, Cr 2 o 3 5%wt%, Co 2 o 3 It is 4%wt%.

Embodiment 3

[0028] Prepared in the same manner as in Example 1. The difference is: weigh 138.3gNaSiO 3 9H 2 O, 140.0gTiCl 4 , 55.4gAlCl 3 ·6H 2 O and 3.8g ammonium metavanadate, 6.4g ammonium tungstate, and 8.1g manganese chloride were used to prepare the catalyst by co-precipitation.

[0029] Analysis of TiO in prepared catalyst 2 Content is 50%wt%, SiO 2 25%wt%, Al 2 o 3 10%wt%, V 2 o 5 2.5%wt%, WO 3 5%wt%, MnO 2 5%wt%.

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Abstract

The invention discloses a co-precipitation preparation method of a composite oxide denitration catalyst and belongs to the technical field of preparation of nitric oxide reduction catalysts. The method comprises the following steps: in the presence of a solvent, mixing aluminum sulfate, titanium sulfate, ammonium vanadate and sodium metasilicate with at least one of ammonium tungstate, manganese chloride, nickel nitrate, cobalt nitrate and chromic nitrate; then placing an obtained precursor into a muffle furnace, and roasting the precursor to obtain the catalyst. According to the method, the use of TiO2 in a conventional V-W-Ti catalyst is reduced, and the cost is reduced; meanwhile, the specific surface area of the catalyst is increased. The formed catalyst contains two or more of components from Ti, Si, Al, V, W, Cr, Ni, Mn and Co; the denitration activity of the catalyst is favorably improved by the strong cooperative action of each active component and a carrier; the catalyst is applicable to SCR (selective catalytic reduction) denitration reaction at low temperature of 250-500 DEG C.

Description

technical field [0001] The invention belongs to the technical field of preparation of nitrogen oxide reduction catalysts, and in particular relates to a preparation method of an SCR composite oxide denitration catalyst. Background technique [0002] Environmental protection is the basic national policy of our country. With the development of industry, the problem of environmental pollution is becoming more and more serious, especially the pollution of nitrogen oxides. NOx is one of the pollutants that cause acid rain, photochemical smog and ozone layer destruction. More than 90% of NOx emissions are produced by the combustion of fossil fuels such as coal, oil, and natural gas. As the largest energy consumer in the world today, my country's NOx emissions have attracted widespread attention from the government and society. The National Twelfth Five-Year Plan clearly states that to achieve a 10% reduction in nitrogen oxide emissions in 2015 compared to 2010, this requires high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/888B01J23/34B01J37/03B01D53/90B01D53/56
Inventor 菅盘铭刘建禹蔡璐钟娟娟张倩纪有鹏孙辉
Owner YANGZHOU UNIV
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