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SCR (Selective Catalytic Reduction) flue gas denitrification catalyst and preparation method thereof

A denitrification catalyst and flue gas technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as easy deactivation, promote adsorption and activation, combine tightly, and prevent excessive hydrolysis speed Effect

Inactive Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst is suitable for lower denitrification temperature, but when the optimum denitrification temperature is lower than 250°C, SO 2 easily inactivated

Method used

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  • SCR (Selective Catalytic Reduction) flue gas denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) TiO 2 - Preparation of molecular sieve composite carrier: First, dissolve 4Kg titanium sulfate and 0.2Kg sodium nitrilotriacetate into 2L deionized water to make a mixed solution; add 0.4Kg powdered HZSM-5 molecular sieve to the above mixed solution for equal volume impregnation ;Dried at 80°C for 12 hours; Calcined at 400°C for 5 hours to obtain TiO 2 - Molecular sieve composite carrier.

[0030] (2) Loading of active components and additives: the TiO prepared in step (1) 2 - The molecular sieve composite carrier is impregnated in a mixed solution of 0.2mol / L cerium nitrate, 0.15mol / L ammonium metatungstate and 0.1mol / L ferric nitrate, taken out, dried at 120°C for 6 hours, and calcined at 450°C for 10 hours The denitration catalyst powder is prepared.

[0031] (3) Forming of honeycomb denitration catalyst: 80 parts of denitration catalyst powder prepared in step (2), 6 parts of glass fiber, 0.1 part of softwood pulp, 0.5 part of polyacrylamide, 2 parts of carbo...

Embodiment 2

[0034] (1) TiO 2 -Preparation of molecular sieve composite carrier: first, dissolve 4Kg titanium sulfate and 0.15Kg disodium edetate into 2L deionized water to make a mixed solution; add 0.4Kg powdered HZSM-5 molecular sieve to the above mixed solution for Equal volume impregnation; drying at 120°C for 6 hours; calcination at 500°C for 1 hour to prepare TiO 2 - Molecular sieve composite carrier.

[0035] (2) Loading of active components and additives: the TiO prepared in step (1) 2 - Immerse the molecular sieve composite carrier in a mixed solution of 0.3mol / L cerium nitrate, 0.1mol / L ammonium metatungstate and 0.4 mol / L tin tetrachloride, take it out, dry it at 110°C for 12 hours, and then dry it at 550°C Calcined for 5 hours to prepare denitration catalyst powder.

[0036] (3) Forming of honeycomb denitration catalyst: 90 parts of denitration catalyst powder prepared in step (2), 4 parts of glass fiber, 0.2 part of wood pulp, 1 part of polyacrylamide, 0.5 part of carboxym...

Embodiment 3

[0039] (1) TiO 2 -Preparation of molecular sieve composite carrier: First, dissolve 4Kg titanium sulfate and 0.1Kg tetrasodium edetate in 2L deionized water to make a mixed solution; add 0.8Kg powdered HY molecular sieve to the above mixed solution for equal volume Impregnation; drying at 110°C for 6 hours; calcination at 600°C for 2 hours to obtain TiO 2 - Molecular sieve composite carrier.

[0040] (2) Loading of active components and additives: the TiO prepared in step (1) 2 - Immerse the molecular sieve composite carrier in a mixed solution of 0.2mol / L cerium nitrate, 0.1mol / L ammonium metatungstate and 0.3mol / L copper nitrate, take it out, dry it at 120°C for 6 hours, and bake it at 450°C for 6 hours The denitrification catalyst powder was prepared in hours.

[0041] (3) Forming of honeycomb denitration catalyst: 75 parts of denitration catalyst powder prepared in step (2), 6 parts of glass fiber, 2 parts of wood pulp, 2 parts of polyacrylamide, 0.1 part of carboxymeth...

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Abstract

The invention discloses a preparation method of an SCR (Selective Catalytic Reduction) flue gas denitrification catalyst. The preparation method comprises the following steps: (1) firstly preparing a mixed solution of titanium sulfate and amino carboxylate, adding powdered molecular sieve into the mixed solution for dipping, and carrying out drying and roasting to prepare a TiO2-molecular sieve composite carrier; (2) dipping the TiO2-molecular sieve composite carrier prepared in the step (1) into dipping liquid containing an active component and an adjuvant precursor, and carrying out drying and roasting to obtain denitrification catalyst powder; (3) mixing the denitrification catalyst powder obtained in the step (2) with glass fiber, wood pulp, polyacrylamide, carboxymethyl cellulose, ammonia water and deionized water, and carrying out kneading, aging, extrusion, drying and roasting to obtain a cellular denitrification catalyst. The preparation method is simple in preparation process and low in cost; the obtained denitrification catalyst is wide in active temperature range, high in denitrification activity and high in SO2 and H2O poisoning resistance.

Description

technical field [0001] The invention relates to an environment-friendly denitrification catalyst, in particular to an SCR flue gas denitrification catalyst and a preparation method thereof, and is particularly suitable for flue gas denitrification treatment. Background technique [0002] Nitrogen oxides (NOx) are one of the chief culprits of smog, acid rain, photochemical smog and greenhouse effect. my country is the world's largest NOx emitter, with NOx emissions reaching 22.4 million tons in 2013. NOx control has become the focus of the country's "12th Five-Year Plan" air pollution control. Selective Catalytic Reduction (SCR) technology is mature, efficient and stable, and has become the mainstream technology and development direction of NOx treatment at home and abroad. Among them, the core of SCR technology is the denitrification catalyst. [0003] At present, the large-scale application of SCR catalysts is based on V 2 o 5 As an active component, TiO 2 As a carrier,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/16B01J29/78B01D53/86B01D53/56
Inventor 王宽岭王学海刘淑鹤陈高升刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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