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Preparation method of structured flue gas denitration catalyst, prepared catalyst and application of catalyst

A denitrification catalyst and structured technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve high oxidation rate, poor mechanical strength, and low catalytic activity and other problems, to achieve low SO2 oxidation rate, improve mechanical strength, and high catalytic activity

Active Publication Date: 2011-08-31
CHINA DATANG TECH & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention not only solves the problems of poor mechanical strength, low catalytic activity and SO 2 The technical problem of high oxidation rate solves the problems of low yield of honeycomb structured catalysts and difficult recycling of spent catalysts
The panel structured V of the present invention 2 o 5 / TiO 2 Based flue gas denitrification catalyst overcomes the problem of low yield of honeycomb structured catalysts, and at the same time it is easy to recycle spent catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 88g nano anatase TiO 2 (the average particle size of the particles is 10 nanometers), add 125mL ammonium metatungstate solution (wherein WO 3 12g), stirred evenly, dried at 110°C for 5 hours, and roasted at 320°C for 2 hours to obtain WO-containing 3 of titanium dioxide powder. Weigh more than 50g of prepared WO-containing 3 Titanium dioxide powder, 5g of bentonite, 2g of hydroxypropyl methylcellulose (HPMC), 2g of glass fiber, and 1g of turnip powder were mixed and stirred and ground to a standard sieve below 100 mesh to obtain a solid mixed powder. In this solid mixed powder, add 15mL ammonium metavanadate solution (wherein V 2 o 5 The amount is 1.2g) and 10mL cerium nitrate solution (in which CeO 2 Amount is 0.9g), after stirring evenly, add ammonia water, adjust its pH value to be 9, after continuing to stir evenly, mud is obtained. After the mud was sealed, it was aged at 30°C for 10 days, and then evenly scraped onto a stainless steel net washed ultras...

Embodiment 2

[0044] Weigh 88g nano anatase TiO 2 (the average particle size of the particles is 10 nanometers), add 125mL ammonium metatungstate solution (wherein WO 3 The amount is 8g), stirred evenly, dried at 110°C for 5 hours, and roasted at 320°C for 2 hours to obtain WO-containing 3 of titanium dioxide powder. Thereafter, the preparation process and performance test evaluation of the catalyst are the same as in Example 1. The specific test results are shown in Table 1 below.

Embodiment 3

[0046] with WO 3 The titanium dioxide powder is prepared with embodiment 1. Weigh more than 50g of prepared WO-containing 3 Titanium dioxide powder, 7.5g of bentonite, 2g of HPMC, 2g of glass fiber, and 2g of turnip powder were mixed and stirred and ground to a standard sieve below 100 mesh to obtain a solid mixed powder. Add 17mL ammonium metavanadate solution (wherein V 2 o 5The amount is 1.2g) and 10mL cerium nitrate solution (wherein the CeO2 amount is 0.9g), after stirring evenly, add ammonia water, adjust its pH to be 10, after continuing to stir evenly, mud is obtained. After the mud was sealed, it was aged at 30°C for 8 days, and then evenly scraped onto a stainless steel net washed ultrasonically with dilute sulfuric acid (concentration: 5%). After rolling, it was dried at 60°C with constant humidity until the moisture content was 12%. , then stamped and formed at room temperature, and finally dried at a rate of 3 °C / min to 60 °C for 6 hours, then dried at a rate ...

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Abstract

The invention relates to a preparation method of structured flue gas denitration catalyst, a prepared catalyst and application of the catalyst. The method comprises the following steps of: pre-mixing TiO2 powder and ammonium meta-tungstate-containing oxalic acid solution to prepare WO3-containing TiO2 powder; mixing the prepared TiO2 powder, an inorganic binder, a plasticizer, glass fibers and sesbania powder in a special mass ratio; adding oxalic acid solution of ammonium metavanadate and aqueous solution of cerous nitrate; mixing the materials; adding ammonia water to adjust the pH value tobetween 9 and 10; ageing the mixture for 5 to 10 days; coating the aged mud material onto a stainless steel net; after rolling the aged mud, forming, and drying and roasting the prepared plate type structural V2O5 / TiO2-based denitration catalyst. The plate type structural V2O5 / TiO2-based denitration catalyst has high mechanical strength and catalytic activity and low SO2 oxidation rate, so the catalyst can be widely applied to the removal of nitric oxide in coal / oil / gas boilers and nitric acid industry.

Description

technical field [0001] The invention relates to a preparation method of a structured denitration catalyst, the prepared catalyst and its application. Specifically, the present invention relates to a high mechanical strength, high catalytic activity and low SO 2 Oxidation rate of plate-structured V 2 o 5 / TiO 2 The preparation method of the based flue gas denitrification catalyst, the prepared catalyst and its application in the removal of nitrogen oxides in flue gas. Background technique [0002] Nitrogen oxide NO x The acid rain phenomenon and photochemical smog caused by (ie nitrate) discharge have brought great harm to the ecological environment and human health, and have already attracted worldwide attention. The sources of nitrate include stationary sources, including coal-fired / oil / gas boilers, nitric acid industry, etc.; and mobile sources, which are mainly automobile exhaust, of which the stationary sources of NO x Accounting for more than 70% of its total emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/22B01J35/02B01D53/86B01D53/56B01J35/00
Inventor 闵健高原王文选杨秀杰刘清雅张春艳刘振宇
Owner CHINA DATANG TECH & ENG
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