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Low-temperature manganese-based denitration catalyst and preparing method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as poor anti-sulfur poisoning performance, improve low-temperature activity, improve preparation efficiency, and reduce storage aging time Effect

Inactive Publication Date: 2013-11-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current low-temperature manganese-based catalyst has poor resistance to sulfur poisoning, and propose a method for preparing a manganese-cerium-based catalyst with good resistance to sulfur poisoning. The catalyst prepared by this method has good long-term resistance to sulfur poisoning performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Catalysts were prepared by ultrasonic impregnation. Firstly, industrial grade TiO 2 Dry at 105°C for 1 hour, cool and then ball mill and pulverize for use; then prepare a 50ml mixed solution with a molar ratio of manganese nitrate: cerium nitrate: yttrium nitrate = 0.4:0.07:0.03; put the mixed solution into an ultrasonic reaction with a power of 160W In the pool, add 8.0g to crush and sieve to obtain 160 mesh TiO 2 Powder, heated to 50°C, stirred and ultrasonically impregnated for 1h, aged for 24h; dried at 105°C for 24h, calcined at 450°C for 6h, ball milled and crushed through a 150-mesh sieve to obtain Mn-Ce-Y / TiO 2 catalyst.

[0020] Catalyst performance evaluation: The activity experiment was carried out on a self-made catalyst test platform, the catalyst loading was 6.5g, the ammonia nitrogen ratio was 1:1, O 2 The concentration is 5%, SO 2 The concentration is 0.01%, GHSV (gas space velocity per hour) = 20000h -1 flue gas, the reaction temperature is 250℃, th...

Embodiment 2

[0022] Catalysts were prepared by ultrasonic impregnation. Firstly, industrial grade TiO 2 Dry at 105°C for 1 hour, cool and then ball mill and pulverize for use; then prepare a 50ml mixed solution in the ratio of manganese nitrate: cerium nitrate: zirconium nitrate = 0.4:0.07:0.03 in molar ratio; put the mixed solution into a 160W power ultrasonic reaction In the pool, add 8.0g to crush and sieve to obtain 120 mesh TiO 2 Powder, heated to 50°C, stirred and ultrasonically impregnated for 1h, aged for 24h; dried at 105°C for 24h, calcined at 450°C for 6h, ball milled and crushed through a 150 mesh sieve to obtain Mn-Ce-Zr / TiO 2 catalyst.

[0023] Catalyst performance evaluation is the same as in Example 1, the denitrification efficiency of the catalyst is 92% when the reaction temperature is 250°C; 2 In the flue gas, the denitrification rate of the catalyst after 50 hours of reaction is 78%, which is higher than that of the undoped Mn-Ce / TiO 2 The long-term denitrification ...

Embodiment 3

[0025] Catalysts were prepared by ultrasonic impregnation. Firstly, industrial grade TiO 2 Dry at 105°C for 1 hour, cool and then ball mill and pulverize for use; then prepare a 50ml mixed solution with a molar ratio of manganese nitrate: cerium nitrate: tungsten nitrate 0.4:0.07:0.03; place the mixed solution in a 160W ultrasonic reaction pool In, add 8.0g crushed and sieved to get 140 mesh TiO 2 Powder, heated to 50°C, stirred and ultrasonically impregnated for 1h, aged for 24h; dried at 105°C for 24h, calcined at 450°C for 6h, ball milled and crushed through a 150 mesh sieve to obtain Mn-Ce-W / TiO 2 catalyst.

[0026] Catalyst performance evaluation is the same as in Example 1, the denitrification efficiency of the catalyst is 95% when the reaction temperature is 250°C; 2 In the flue gas, the denitrification rate of the catalyst after 50 hours of reaction is 83%, which is higher than that of the undoped Mn-Ce / TiO 2 The long-term denitrification efficiency of the catalyst...

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Abstract

The invention discloses a low-temperature manganese-based denitration catalyst and a preparing method thereof and relates to the catalyst used in the technical field of air pollution control and a preparing method thereof. The catalyst uses industrial TiO2 as a carrier and carries transition metal M dosed manganese and cerium active components, wherein molar ratio of the components is, Ti: Mn: Ce: transition metal M= 1: (0.05-2): (0.05-.1): (0.01-0.1), and the transition metal M is W, La, Pr, Zr and Y. By means of the preparing method, the catalyst is prepared in an ultrasonic immersing method, so that dispersibility of the active components on the carrier is improved, and the preparing period of the catalyst is reduced. The prepared catalyst is used for reduction reactions of low-temperature NOx, has lasting sulfur poisoning resisting performance and is suitable for the environment-protection fields of tail gas denitration of power plants and large coal consuming enterprises.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control and a preparation method thereof, in particular to a supported manganese-based catalyst doped with a transition metal element and a preparation method thereof, which is used for low-temperature NO x reduction reaction. Background technique [0002] Based on the newly added NO in the country's "Twelfth Five-Year Plan" x Constraint indicators, using efficient NO x Control technology is imperative. Selective catalytic reduction technology (SCR) has the best advantages among various technologies, and its research focuses on the selection and preparation of catalysts. Manganese-based low-temperature SCR catalysts have attracted widespread attention because they can be installed after dust removal devices to reduce installation and use costs. At present, the widely studied manganese-based catalysts include MnO x / TiO 2 , V 2 o 5 / AC,MnO 2 -CeO 2 etc., with high...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 孙克宁乔金硕尹肖菊
Owner HARBIN INST OF TECH
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