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Perovskite substance, thermal power plant denitration compound catalyst and preparation methods thereof

A composite catalyst, perovskite-type technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc., can solve problems such as unfavorable industrial production and complex process of perovskite-type substances.

Inactive Publication Date: 2016-11-23
无锡市华东电力设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing preparation process of perovskite-type substances is complex and unfavorable for industrial production, the present invention provides a method for preparing perovskite-type substances, which includes the following steps: using lanthanum nitrate, strontium nitrate, and chromium nitrate as raw material precursors Dissolve in water, wherein the weight ratio of lanthanum nitrate, strontium nitrate and chromium nitrate is 15-30:15-30:55-60 to obtain a mixed salt solution, and then calcinate the mixed salt solution at a high temperature to obtain a perovskite type substance

Method used

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preparation example Construction

[0037] The preparation method of active liquid is to adopt ammonium metavanadate, ammonium tungstate to dissolve in oxalic acid solution to obtain active liquid, the concentration (mass ratio) of oxalic acid solution is 10%, the quality of ammonium metavanadate, ammonium tungstate and oxalic acid solution The ratio is 10:16:55.

[0038] According to the flue gas composition of the simulated thermal power plant, the flue gas composition is 1000ppm nitric oxide, 700-1500ppm ammonia, and 5-7% nitrogen. The denitrification catalyst sample prepared by the above method is tested for the purification effect of simulated exhaust gas.

[0039] Utilize the method of the present invention to obtain a typical example: a kind of anatase titanium dioxide obtained according to the above method is a denitration catalyst as a raw material, the prepared denitration catalyst product size is 40mm × 40mm × 40mm, and the pore density is 3 pores / cm2, section The distance is 7.4mm. According to the ...

Embodiment 1

[0041] The method for preparing a thermal power plant denitrification composite catalyst with anatase titanium dioxide as a substrate comprises the following sequential steps:

[0042] Step 1: preparing modified titanium dioxide, comprising the following steps:

[0043] Anatase titanium dioxide is added to water to prepare a suspension with a concentration of 1% by weight; sodium hexametaphosphate is added to the suspension as a dispersant, and the amount of sodium hexametaphosphate added is 0.1% of the weight of titanium dioxide. After 10 minutes, the mixed slurry was obtained; then the mixed slurry was heated to 60°C, and sodium silicate solution was added dropwise to the mixed slurry, wherein sodium silicate was used as the precursor of nano-scale silicon dioxide, and the dropping amount of sodium silicate 0.1% of the weight of titanium dioxide, then drop dilute sulfuric acid in the mixed slurry, adjust the pH value of the mixed slurry to 8, then age the mixed slurry for 2h...

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Abstract

The invention discloses a perovskite substance, a thermal power plant denitration compound catalyst and preparation methods thereof and belongs to the technical field of flue gas denitration catalysts. In order to solve the problem that existing perovskite substance preparation processes are complex, the invention provides the preparation method of the perovskite substance. The preparation method of the perovskite substance includes: dissolving lanthanum nitrate, strontium nitrate and chromium nitrate as raw material precursors in water; calcining at high temperature to obtain the perovskite substance. In order to solve the problem that existing denitration catalysts cause ammonia escape during nitration, the invention further provides the preparation method of the thermal power plant denitration compound catalyst. The preparation method of the thermal power plant denitration compound catalyst includes following steps: kneading titanium dioxide mixture, active liquid, water, glycerin, ethylene glycol, glass fiber and aluminum dihydrogen phosphate to obtain ceramic pug; performing vacuum extrusion to obtain a cellular ceramic blank; subjecting the cellular ceramic blank to steam drying and calcining to obtain the thermal power plant denitration compound catalyst. The catalyst is high in nitration efficiency, and the problem of ammonia escape is solved.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitration catalysts, in particular to a thermal power plant denitration composite catalyst with anatase titanium dioxide as a matrix and a preparation method thereof. Background technique [0002] Nitrogen oxides are the main pollution source of the atmosphere. It not only causes acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endangers human health. Therefore, how to effectively remove nitrogen oxides has become an important topic of concern in the field of environmental protection. Preparation of catalysts for selective catalytic reduction of ammonia. At present, scholars at home and abroad have conducted in-depth and systematic research on many catalyst systems, such as Cr2O3 / TiO2 and CeO2 / TiO2. At present, most of the NH3-SCR catalysts for industrial application use TiO2 as the carrier, and then upload a certain amount of...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/26B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/26B01J23/30B01D2258/0283B01J2523/00B01J35/56B01J2523/24B01J2523/3706B01J2523/67B01J2523/41B01J2523/47B01J2523/55B01J2523/69
Inventor 丁建峰
Owner 无锡市华东电力设备有限公司
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