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Coated low-temperature flue gas denitration catalyst, and preparation method and application thereof

A denitrification catalyst and low-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of NOx conversion rate decline, achieve good coating firmness, large specific surface area, and preparation Simple and reasonable process

Inactive Publication Date: 2015-12-09
HAO HUA CHENGDU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unsupported manganese-based oxide catalyst prepared by Tang Xiaolong et al. using a low-temperature solid-phase method has good low-temperature activity, and its NOx removal rate can reach 100% at 100 ° C. When 0.01% SO 2 and 10%H 2 After O, the NOx conversion dropped to 70% due to competitive adsorption

Method used

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  • Coated low-temperature flue gas denitration catalyst, and preparation method and application thereof
  • Coated low-temperature flue gas denitration catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] Immerse 100g of commercial cordierite honeycomb ceramics with a pore size of 5 mesh in 150mL of 2mol / L nitric acid solution for pretreatment, take it out after immersion for 1.5h, and then wash it with 300mL deionized water for 4 times until the washing liquid becomes neutral. Dry in an oven for 8 hours to obtain modified cordierite honeycomb ceramics.

[0046] 200g of TiOSO 4 Add 1 L of sulfuric acid solution with a mass concentration of 3.5%, and heat and stir in a water bath at 45° C. for 2 hours to prepare a titanyl sulfate solution. After filtering the titanyl sulfate solution, a clear 200 g / L titanyl sulfate solution was obtained. 2mol / L K 2 CO 3 The solution was slowly added into the titanyl sulfate solution above, the dropping rate was 1 mL / min and the pH at the end of the dropping was 2-2.5. 2ml of Tween 80 was added to the obtained suspension as a dispersant, and stirred at a constant speed for 4h. The resulting suspension was washed with deionized water ...

example 2

[0052] Using the method in Example 1, the cordierite honeycomb ceramics were first modified and pretreated to prepare titanium dioxide powder.

[0053] A certain amount of deionized water was added into the three-necked flask, and the deionized water in the three-necked flask was heated to 88°C. Under the condition of magnetic stirring, add ultra-high-purity pseudo-boehmite-type aluminum hydroxide (SB powder) evenly into the deionized water, wait for the SB powder and deionized water to form a suspension of a certain concentration, reflux and stir for 2 hours, and then follow the Add 2mol / L nitric acid in a certain proportion, wherein the concentration ratio of SB powder and nitric acid is c(H + ) / c(AlOOH)=0.2; then add polyethylene glycol 400 (PEG400) with a mass concentration of 5%, so that the SB powder is fully peptized, and finally the colloid is aged for 7 hours under reflux conditions at 100°C to form a mass concentration of 12% stabilized aluminum sol.

[0054] With ...

example 3

[0058] Using the method in Example 1, the cordierite honeycomb ceramics were first modified and pretreated to prepare titanium dioxide powder.

[0059] A certain amount of deionized water was added into the three-necked flask, and the deionized water in the three-necked flask was heated to 82°C. Under the condition of magnetic stirring, add ultra-high-purity pseudo-boehmite-type aluminum hydroxide (SB powder) evenly into the deionized water, wait for the SB powder and deionized water to form a suspension with a certain concentration, reflux and stir for 3 hours, and then follow the Add 3mol / L nitric acid in a certain proportion, wherein the concentration ratio of SB powder and nitric acid is c(H + ) / c(AlOOH)=0.1; then add polyethylene glycol 400 (PEG400) with a mass concentration of 6%, to make the SB powder fully peptized, and finally make the colloid age under reflux conditions at 85°C for 8h to form a mass concentration of 10% stabilized aluminum sol.

[0060] With Mn(CH ...

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Abstract

The invention discloses a coated low-temperature flue gas denitration catalyst, and a preparation method and application thereof. The catalyst comprises a first carrier, a second carrier, active components and auxiliaries, wherein the first carrier adopts modified cordierite honeycomb ceramics; the second carrier adopts titanium dioxide; the active components comprise manganese oxide and vanadium oxide; the auxiliaries comprise cerium oxide and tungsten oxide; the catalyst is formed by coating the first carrier with catalyst size prepared from catalyst active component powder containing the second carrier, the active components and the auxiliaries through adopting a vacuum extraction method and then performing calcining; the catalyst active component powder comprises MnO2, V2O5, CeO2, WO3 and TiO2 with the mass ratio of (1-2) to (1-2) to (1-2) to (1-6.5) to (87.5-96). The catalyst is large in specific surface area and better in coating firmness, and has high catalytic activity at low temperature.

Description

technical field [0001] The present invention relates to the technical field of flue gas denitrification catalyst preparation, more specifically, to a coating-type low-temperature flue gas denitrification catalyst suitable for thermal power plants and arranged in the tail process after the dust collector and desulfurization section, and its preparation method and application. Background technique [0002] With the development of science and technology, social productivity has been greatly improved, and the accompanying problems are deteriorating environmental problems. Global environmental problems such as acid rain, photochemical smog, and ozone layer destruction are becoming more and more serious. Occurrence is closely related to hydrocarbons and nitrogen oxides emitted by humans into the atmosphere. [0003] With the improvement of people's awareness of environmental protection, nitrogen oxides (NO x ) emissions have received more and more attention. In recent years, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01D53/86B01D53/56
Inventor 王蕾李敬张向辉王磊胡洧冰郑珩张新波何洋
Owner HAO HUA CHENGDU TECH
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