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High-temperature smoke selective catalytic reduction (SCR) denitration catalyst, preparation method and application thereof

A denitrification catalyst and high-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of poor loading uniformity and adhesion of active components on the catalyst surface, complicated process, and high cost , to avoid severe slurry loss and high specific surface area

Active Publication Date: 2011-02-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the overall V 2 o 5 -WO 3 A series of catalyst preparation technologies have the disadvantages of complex process, high cost, and poor loading uniformity and adhesion of active components on the surface of the catalyst. To provide a preparation method for in-situ loading of catalysts on the surface of honeycomb cordierite carrier without preparing slurry and binder , the active components can be highly dispersed on the surface of cordierite, and the catalyst active layer formed on the surface has high adhesion and uniformity

Method used

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  • High-temperature smoke selective catalytic reduction (SCR) denitration catalyst, preparation method and application thereof
  • High-temperature smoke selective catalytic reduction (SCR) denitration catalyst, preparation method and application thereof
  • High-temperature smoke selective catalytic reduction (SCR) denitration catalyst, preparation method and application thereof

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Effect test

Embodiment 1

[0029] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm), completely immerse in 1.0wt% nitric acid solution for 60 minutes, then rinse the cordierite with deionized water to remove surface impurities, put it in an oven and dry it at 110°C for 12 hours , to obtain surface-activated cordierite honeycomb ceramics for use.

[0030] Dissolve 5.0 g of 27 wt % silica sol and 30.0 g of titanyl sulfate in 150 ml of water to obtain a coating impregnation solution, immerse the surface-activated cordierite honeycomb ceramics in the coating impregnation solution for 20 minutes, take out the cordierite, and use high pressure Blow off the flowing droplets on the surface with an air gun, and then dry at 110°C for 30 minutes. The dried cordierite was completely immersed in 25 wt% ammonia water for 20 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the ammonia water droplets on the surface with high-pressure air, and then dry it at 110°C for 4 hours t...

Embodiment 2

[0033] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm), completely immerse in 2wt% nitric acid solution for 30 minutes, then rinse the cordierite with deionized water to remove surface impurities, put it in an oven and dry it at 110°C for 12h, The surface-activated cordierite carrier honeycomb ceramic is obtained for use.

[0034] Dissolve 42g of 27wt% silica sol and 30.0g of titanyl sulfate in 150ml of water to obtain a coating impregnation solution, immerse the surface-activated cordierite honeycomb ceramics in the coating impregnation solution for 10 minutes, take out the cordierite, and use a high-pressure air gun Blow off the flowing droplets on the surface, and then dry at 110°C for 30 minutes. The dried cordierite was completely immersed in a 5wt% NaOH solution for 20 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the liquid droplets on the surface with high-pressure air, and then dry it at 110°C for 4 hours to obtain cordi...

Embodiment 3

[0037] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm), put it into 3wt% nitric acid solution and immerse it for 40 minutes, then rinse the cordierite with deionized water, wash away the surface impurities, put it in an oven and dry it at 150°C for 12h to get Surface-activated cordierite carrier honeycomb ceramics are ready for use.

[0038] Dissolve 83.0g of 27wt% silica sol and 30.0g of titanyl sulfate in 150ml of water to obtain a coating impregnation solution, immerse the surface-activated cordierite honeycomb ceramics in the coating impregnation solution for 20 minutes, take out the cordierite, and use high-pressure Blow off the flowing droplets on the surface with an air gun, and then dry at 110°C for 30 minutes. The dried cordierite was completely immersed in 25 wt% ammonia water for 20 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the ammonia water droplets on the surface with high-pressure air, and then dry it at 110°C f...

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Abstract

The invention discloses a high-temperature smoke selective catalytic reduction (SCR) denitration catalyst. The high-temperature smoke SCR denitration catalyst consists of a carrier and an active ingredient loaded on the carrier and is characterized in that: the carrier is a cordierite honey ceramic loaded with a TiO2-SiO2 coating; and the loading capacity of the TiO2-SiO2 coating is 5 to 30 weight percent. The high-temperature smoke SCR denitration catalyst is prepared by loading titanyl sulfate and silica sol serving as raw materials on a cordierite honey ceramic base material by an in-situ precipitation method so as to form the uniform and firm TiO2-SiO2 coating on the surface of the base material, wherein the obtained TiO2-SiO2 coating has high specific surface area and proper acid strength and can effectively promote catalysis.

Description

(1) Technical field [0001] The invention relates to the technical field of flue gas denitrification in thermal power plants, in particular to a TiO-loaded 2 -SiO 2 Preparation method of coated cordierite honeycomb ceramic catalyst and its application in flue gas selective catalytic reduction (SCR) denitrification. (2) Background technology [0002] NO X It is one of the main harmful substances that pollute the atmosphere. Coal burning produces a large amount of NO X One of the main ways, especially coal combustion in thermal power plants, accounts for about NO X 50% of emissions. Compared with other technologies, selective catalytic reduction (SCR) uses ammonia, urea and low-carbon hydrocarbons as reducing agents to selectively reduce NO in exhaust gas through catalysts X Converted to non-polluting element molecule N 2 and H 2 O, characterized by low cost and high efficiency, is currently the most widely used denitrification technology. [0003] Catalyst is the core ...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/90B01J27/053
Inventor 卢晗锋陈银飞黄海凤周小燕张峰
Owner ZHEJIANG UNIV OF TECH
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