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Scr flue gas denitrification catalyst and preparation method based on tio2 carrier promoted by sulfate radical

A technology of denitration catalyst and sulfate radical, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low denitrification activity of the catalyst, weak acid sites on the surface of the carrier, and narrow activation temperature window. Achieve superior catalytic activity, strong oxidation-reduction performance, and more acidic sites

Active Publication Date: 2011-11-30
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither the single TiO 2 Whether the carrier or the composite carrier, there is the problem that the acid sites on the surface of the carrier are not strong, which limits the amount of ammonia adsorption, making the denitrification activity of the catalyst not high and the active temperature window is narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Nano 5O 4 2- / TiO 2 Preparation of carrier: measure 8.93g of nano-TiO 2 , placed in 100mL of sulfuric acid solution with a concentration of 0.1mol / L, and soaked for 24h under stirring; filter the above materials, dry them in an ordinary blast drying oven at 110°C for 10h, and roast them in a muffle furnace at 500°C (The heating rate is programmed to be 3°C / min, and the holding time is 3h), that is, to obtain nano-SO 4 2- / TiO 2 carrier.

[0026] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 5.61: 1: 9.72, concrete operation is:

[0027] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 0.505g of cerium nitrate and dissolve it in 8.93g of deionized water. 4 2- / TiO 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand for 2 h; then the above-mentioned material was dried at 110 °C for 3 h in an ordinary blast dryi...

Embodiment 2

[0031] (1) Nano-SO 4 2- / TiO 2 Preparation of carrier: measure 8.9g of nano-TiO 2 , placed in 100mL of sulfuric acid solution with a concentration of 0.15mol / L, soaked for 24h under stirring; filtered the above materials, dried in an ordinary blast drying oven at 110°C for 10h, and roasted in a muffle furnace at 500°C (The heating rate is programmed to be 3°C / min, and the holding time is 3h), that is, to obtain nano-SO 4 2- / TiO 2 carrier.

[0032] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 5.85: 1: 5.89, concrete operation is:

[0033] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 0.76g of cerium nitrate and dissolve it in 8.9g of deionized water. 4 2- / TiO 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand for 2 h; then the above-mentioned material was dried at 110 °C for 3 h in an ordinary blast drying oven, a...

Embodiment 3

[0037] (1) Nano-SO 4 2- / TiO 2 Preparation of carrier: Measure 8.88g of nano-TiO 2 , placed in 133.2 mL of sulfuric acid solution with a concentration of 0.05 mol / L, and soaked for 24 hours under stirring; the above materials were filtered, dried at 110°C for 10 hours in an ordinary blast drying oven, and dried at 500°C in a muffle furnace. Roasting (programmed temperature increase rate is 3°C / min, holding time is 3h), that is, to obtain nano-SO 4 2- / TiO 2 carrier.

[0038] Measure cerium nitrate, ammonium metavanadate and ammonium tungstate that mass ratio is 8.08: 1: 3.51, concrete operation is:

[0039] (2) Auxiliary CeO 2 Loading: According to the equal-volume impregnation method, measure 1.26g of cerium nitrate and dissolve it in 8.88g of deionized water. 4 2- / TiO 2 The carrier was added to the above-mentioned cerium nitrate solution, ultrasonically treated for 1 h and left to stand for 2 h; then the above-mentioned material was dried at 110 °C for 3 h in an o...

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Abstract

The invention relates to a sulfate radical promoted nanometer TiO2 carrier based SCR (Selective Catalytic Reduction) flue gas denitration catalyst and a preparation method thereof, belonging to the fields of environmental protection and environmental catalysis. In the invention, a SO42- / TiO2 carrier based medium / low-temperature flue gas denitration catalyst is obtained through taking sulfate radical promoted nanometer TiO2 (SO42- / TiO2) as the carrier, taking WO3 and CeO2 as auxiliaries and taking V2O5 as an active component, wherein in the composite catalysis, the mass percentage of the V2O5 is 0.5-1.5%; the mass percentage of the WO3 is 4-10%; the mass percentage of the CeO2 is 1-5%; and the balance is SO42- / TiO2. The acidity of the catalyst is obviously increased after nanometer TiO2 issubject to sulfating treatment; the denitration activity of the catalyst is increased through interacting with the V2O5, the WO3 and the CeO2; and very good catalytic activity is showed through taking ammonia as a reducing agent at a temperature of 150-450 DEG C.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and specifically relates to a novel nano-TiO based on sulfate radical promotion 2 Carrier SCR flue gas denitrification catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are easy to form acid rain in the atmosphere, destroy the ozone layer and cause the greenhouse effect, which seriously damages the environment; under certain conditions, they will generate photochemical smog, which has brought serious harm to human health. NOx in the flue gas of coal-fired power generation is the main source of pollution. According to statistics, about 60% of NOx in my country's air pollutants comes from the combustion of coal. Among them, the coal used in thermal power plants accounts for 70% of the country's coal combustion. Therefore, how to effectively The control of NOx emissions from thermal power plants has attracted much attentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01D53/86B01D53/56
Inventor 陆强苏淑华董长青杨勇平
Owner 北京华电光大环境股份有限公司
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