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Method for preparing denitration catalyst

A denitration catalyst, dilute nitric acid technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low NO conversion rate and high catalyst cost, and achieve the goal of improving conversion rate, simplifying production process, reducing small scale effect

Inactive Publication Date: 2012-02-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that V 2 o 5 / TiO 2 Catalyst, in V / TiO 2 When the weight ratio is 4%, the conversion rate of NO reaches 83%. The catalyst only loads more vanadium, which makes the cost of the catalyst high and the conversion rate of NO is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use the intermediate metatitanic acid (particle size distribution of 10-200 nanometers) from the titanium dioxide factory, disperse and beat with dilute nitric acid, and filter. When the water on the filter cake is about to dry, add dilute nitric acid to continue filtering, and continue to add nitric acid to filter until Fe was not detected in the filtrate 3+ .Add dilute ammonia water to the obtained filter cake to make slurry, disperse and filter, when the water on the filter cake is about to dry, add dilute ammonia water and continue to filter until the filtrate is neutral, then add water to beat and disperse metatitanic acid to prepare metatitanic acid slurry . Add ammonium tungstate, ammonium molybdate and ammonium vanadate in sequence to the metatitanic acid slurry, so that the mass ratios of the three ammonium salts to metatitanic acid are 1 / 100, 1 / 100 and 0.1 / 100 respectively, and then the mixture slurry The material is ultrasonically beaten to dissolve and disp...

Embodiment 2

[0018] Use the intermediate metatitanic acid (particle size distribution of 10-200 nanometers) from the titanium dioxide factory, disperse and beat with dilute nitric acid, and filter. When the water on the filter cake is about to dry, add dilute nitric acid to continue filtering, and continue to add nitric acid to filter until Fe was not detected in the filtrate 3+ .Add dilute ammonia water to the obtained filter cake to make slurry, disperse and filter, when the water on the filter cake is about to dry, add dilute ammonia water and continue to filter until the filtrate is neutral, then add water to beat and disperse metatitanic acid to prepare metatitanic acid slurry . Add ammonium tungstate, ammonium molybdate and ammonium vanadate in sequence to the metatitanic acid slurry, so that the mass ratios of the three ammonium salts to metatitanic acid are 5 / 100, 2 / 100 and 0.5 / 100, and then the mixture slurry The material is ultrasonically beaten to dissolve and disperse the adde...

Embodiment 3

[0021] Use the intermediate metatitanic acid (particle size distribution of 10-200 nanometers) from the titanium dioxide factory, disperse and beat with dilute nitric acid, and filter. When the water on the filter cake is about to dry, add dilute nitric acid to continue filtering, and continue to add nitric acid to filter until Fe was not detected in the filtrate 3+ .Add dilute ammonia water to the obtained filter cake to make slurry, disperse and filter, when the water on the filter cake is about to dry, add dilute ammonia water and continue to filter until the filtrate is neutral, then add water to beat and disperse metatitanic acid to prepare metatitanic acid slurry . Add ammonium tungstate, ammonium molybdate and ammonium vanadate in sequence to the metatitanic acid slurry, so that the mass ratios of the three ammonium salts to metatitanic acid are 1 / 100, 5 / 100 and 1 / 100 respectively, and then the mixture slurry The material is ultrasonically beaten to dissolve and disper...

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Abstract

The invention discloses a preparation method of a denitration catalyst. The method comprises the following steps: (1) with an intermediate product of metatitanic acid from a titanium dioxide factory as a raw material, washing with dilute nitric acid, weak aqua ammonia, deionized water respectively to remove impurity ions so as to prepare metatitanic acid slurry; (2) orderly adding ammonium tungstate, ammonium molybdate and ammonium metavanadate into the metatitanic acid slurry, beating the mixture by ultrasonic wave, adjusting the pH of the slurry to 4.0-6.5 by an acid; (3) allowing the mixed slurry to stand, drying to obtain the catalyst powder; (4) compacting and molding the catalyst powder into honeycomb by a mold, performing heat treatment at 200-600 DEG C for 4-10 hours to obtain the denitration catalyst of the invention. The method for preparing the denitration catalyst of the invention has low cost and simple process, and the denitration catalyst can increase the conversion rate of NO. The denitration catalyst of the invention can realize a conversion rate of NO in power plant flue gas flue gas components of up to above 97% at a reaction temperature of 350 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a denitration catalyst. Background technique [0002] NO x It is one of the main pollutants in the atmosphere, which is produced by the combustion of fossil fuels and air at high temperature, mainly including NO, NO 2 and N 2 O, of which NO accounts for more than 90%, NO 2 Accounted for 5% to 10%. NO x It is not only harmful to human health, but also an important substance that destroys the environment and forms acid rain and photochemical smog. my country's coal-based energy source determines that my country's air pollution is characterized by soot-type pollution. Compared with developed countries, the overall technical level of existing coal-fired power units in my country is backward, the coal consumption of power generation is high, and the energy utilization rate is low, which further aggravates the gas emissions and environmental pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 储向峰杨帆周影陈同云董永平孙文起张王兵
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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