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Perovskite-type substance La<1-x>Sr<x>CrO<3>, heat-engine plant denitration composite catalyst, and preparation methods of perovskite-type substance La<1-x>Sr<x>CrO<3> and heat-engine plant denitration composite catalyst

A composite catalyst and perovskite-type technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as unfavorable industrial production and complicated processes, Achieve high plasticity, improve extrusion molding process, and increase density

Inactive Publication Date: 2014-06-18
SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the existing preparation of perovskite type material La 1-x Sr x CrO 3 The process is complex and unfavorable for industrialized production. The invention provides a perovskite-type substance La 1-x Sr x CrO 3 The preparation method comprises the following steps:

Method used

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  • Perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt;, heat-engine plant denitration composite catalyst, and preparation methods of perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt; and heat-engine plant denitration composite catalyst
  • Perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt;, heat-engine plant denitration composite catalyst, and preparation methods of perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt; and heat-engine plant denitration composite catalyst
  • Perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt;, heat-engine plant denitration composite catalyst, and preparation methods of perovskite-type substance La&lt;1-x&gt;Sr&lt;x&gt;CrO&lt;3&gt; and heat-engine plant denitration composite catalyst

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preparation example Construction

[0049] 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.

[0050] According to the flue gas composition of the simulated thermal power plant, the flue gas composition is 1000ppm of nitric oxide, 700-1500ppm of ammonia, and 5-7% of nitrogen. The denitrification catalyst sample prepared by the above method is tested for the purification effect of simulated exhaust gas.

[0051] Utilize the method of the present invention to obtain a typical example: a kind of anatase titanium dioxide prepared according to the above method is a denitration catalyst as a raw material, and the prepared denitration catalyst has a product size of 40mm × 40mm × 40mm, and a pore density of 3 pores / cm 2 , pitch 7.4mm. According to the i...

Embodiment 1

[0059] The method for preparing a thermal power plant denitrification composite catalyst with anatase titanium dioxide as a substrate comprises the following sequential steps:

[0060] Step 1: preparing modified titanium dioxide, comprising the following steps:

[0061] 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 into the mixed slurry, adjust the pH value of the mixed slurry to 8, and then age the mixed slurry ...

Embodiment 2

[0079] The method for preparing a thermal power plant denitrification composite catalyst with anatase titanium dioxide as a substrate comprises the following sequential steps:

[0080] Step 1: preparing modified titanium dioxide, comprising the following steps:

[0081] Anatase titanium dioxide is added to water to prepare a suspension with a concentration of 5% by weight; sodium hexametaphosphate is added to the suspension as a dispersant, and the amount of sodium hexametaphosphate added is 0.25% of the weight of titanium dioxide. After 15 minutes, the mixed slurry was obtained; then the mixed slurry was heated to 75°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 amount of sodium silicate added 0.3% of the weight of titanium dioxide, then drop dilute sulfuric acid into the mixed slurry, adjust the pH value of the mixed slurry to 9, and then age the mixed slurry fo...

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Abstract

The invention discloses perovskite-type substance La<1-x>SrCrO<3>, a heat-engine plant denitration composite catalyst, and preparation methods of the perovskite-type substance La<1-x>SrCrO<3> and the heat-engine plant denitration composite catalyst, and belongs to the technical field of flue gas denitrification catalyst. The preparation method of the perovskite-type substance La<1-x>SrCrO<3> is used for solving a problem that existing preparation method of the perovskite-type substance is complex. According to the preparation method of the perovskite-type substance La<1-x>SrCrO<3>, lanthanum nitrate, strontium nitrate, and chromium nitrate are taken as raw material precursors, and are dissolved in water, and then are subjected to high-temperature roasting so as to obtain finished products. The preparation methods of the heat-engine plant denitration composite catalyst is used for solving a problem of existing denitration catalyst that ammonia is released in denitration processes. According to the preparation methods of the heat-engine plant denitration composite catalyst, a titanium dioxide mixture, an active liquid, water, glycerin, ethylene glycol, glass fiber, and aluminium dihydrogen phosphate are subjected to kneading so as to obtain ceramic clay; the ceramic clay is subjected to vacuum extrusion so as to obtain honeycomb ceramic blank; and the honeycomb ceramic blank is subjected to steam drying and roasting so as to obtain products. The heat-engine plant denitration composite catalyst is high in denitration rate, and is capable of solving a problem of ammonia escaping.

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. Ammonia selective catalytic reduction (selective catalytic reduction, SCR) has become the mainstream denitrification technology for stationary sources such as thermal power plants due to its maturity and high efficiency, and its core problem lies in the development of catalysts. At present, scholars at home and abroad have carried out in-depth and...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01D53/90B01D53/56
Inventor 张现龙姜瑞霞张蓓周坚刚
Owner SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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