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Method for preparing V2O5-WO3/TiO2 powder for making denitration catalyst

A V2O5-WO3, denitrification catalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to reduce the amount of ammonia, facilitate large-scale production, reduce The effect of ammonia nitrogen content

Active Publication Date: 2013-02-13
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The denitration catalyst is based on nano-titanium dioxide as a carrier, loaded with active components vanadium pentoxide and cocatalyst tungsten trioxide, and many reports on WO 3 -TiO 2 Preparation of composite powder, but about V 2 o 5 -WO 3 / TiO 2 Composite powders are rarely reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Make a slurry of 500L metatitanic acid, an intermediate product of titanium dioxide produced by the sulfuric acid method, with a concentration of TiO 2 Calculated as 250g / L, adjust the pH value to 4.0 with caustic soda at 60°C, then adjust the pH value to 5.0 with ammonia water, press filter and wash with water after the adjustment is completed.

[0019] 2) Preparation of impregnation solution, weigh 10.5kg of oxalic acid, add it to 23.5L, 60°C water, add 14.6kg of ammonium metatungstate after completely dissolving, stir and dissolve, then slowly add 3.49kg of ammonium metavanadate, all After dissolving, it is left to age until the color does not change and becomes stable. This process will produce a large amount of gas.

[0020] 3) Beat the filter cake obtained by washing in step 1) to a concentration of TiO 2 Add 500L of 250g / L slurry, add the impregnating solution prepared in step 2 at 60°C, stir for 2 hours and press filter;

[0021] 4) Calcining the filter cak...

Embodiment 2

[0024] 1) Make a slurry of 500L metatitanic acid, an intermediate product of titanium dioxide produced by the sulfuric acid method, with a concentration of TiO 2 Calculated as 280g / L, adjust the pH value to 5.0 with caustic soda at 60°C, then adjust the pH value to 5.6 with ammonia water, press filter and wash with water after the adjustment is completed.

[0025] 2) Preparation of impregnation solution, weigh 11.9kg of oxalic acid, add it to 26.7L of water at 60°C, add 19.8kg of ammonium metatungstate after completely dissolving, stir and dissolve, then slowly add 3.95kg of ammonium metavanadate, all After dissolving, it is left to age until the color does not change and becomes stable. This process will produce a large amount of gas.

[0026] 3) Beat the filter cake obtained by washing in step 1) to a concentration of TiO 2 Add 500L of 280g / L slurry, add the impregnation solution prepared in step 2) at 60°C, stir for 3 hours and press filter;

[0027] 4) Calcining the filt...

Embodiment 3

[0030] 1) Make a slurry of 500L metatitanic acid, an intermediate product of titanium dioxide produced by the sulfuric acid method, with a concentration of TiO 2 Calculated as 280g / L, adjust the pH value to 5.0 with caustic soda at 60°C, then adjust the pH value to 5.7 with ammonia water, press filter and wash with water after the adjustment is completed.

[0031] 2) Preparation of impregnation solution, weigh 12.0kg of oxalic acid, add it to 26.9L of water at 60°C, add 23.4kg of ammonium metatungstate after completely dissolving, stir and dissolve, then slowly add 4.00kg of ammonium metavanadate, all After dissolving, it is left to age until the color does not change and becomes stable. This process will produce a large amount of gas.

[0032] 3) Beat the filter cake obtained by washing in step 1) to a concentration of TiO 2 Add 500L of 280g / L slurry, add the impregnation solution prepared in step 2) at 60°C, stir for 4 hours and press filter;

[0033] 4) Calcining the filt...

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Abstract

The invention discloses a V2O5-WO3 / TiO2powder for making a denitration catalyst, which comprises the following steps of: 1) making metatitanic acid into pulp at a concentration of 280 to 320g / L based on TiO2, heating the pulp to 60 DEG C, regulating the pH value to 5.0 with caustic soda, regulating the pH value to 5.5 to 5.7 with ammonia water, and filtering the pulp by pressure and washing the filter cake by water; 2) preparing an impregnation solution; 3) making the filter cake made by the step 1) into pulp at a concentration of 280 to 320g / L based on TiO2, heating to 60 DEG C, adding the pulp into the impregnation solution obtained by the step 2), stirring the mixture for 2 to 4 hours, and filtering the solution by pressure; 4) calcining the filter cake obtained by the step 3) at 400 to 550 DEG C for 2 to 5h; and 5) crushing the calcined material obtained by the step 4).

Description

technical field [0001] The invention relates to a V 2 o 5 -WO 3 / TiO 2 Powder preparation method. Background technique [0002] The flue gas generated by coal combustion is mainly nitrogen oxides of nitrogen monoxide and nitrogen dioxide, which is an important cause of photochemical smog and acid rain, and is also an important greenhouse gas. Therefore, at the end of July 2011, the state promulgated the "Emission Standards for Air Pollution from Thermal Power Plants", which requires that the nitrogen oxide emissions of all newly built thermal power units after 2012 shall not exceed 100mg / m 3 After 2014, the nitrogen oxide emissions of all thermal power units in key areas shall not exceed 100mg / m 3 , non-key areas shall not exceed 200mg / m 3 Therefore, the denitration treatment of flue gas is an urgent task for environmental protection. SCR (Selective Catalytic Reduction) flue gas denitrification technology is currently the most effective technology commonly used in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 陈建立豆君孙亮邱巧锐赵海娟
Owner LOMON BILLIONS GRP CO LTD
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