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Fe-ZSM-5 catalyst used in NOx selective catalytic reduction, and preparation method thereof

A technology of fe-zsm-5 and catalyst, which is applied in the field of air pollution control technology and environmental protection catalytic materials, can solve the problems of poor O performance, high activity temperature, and low catalyst denitrification efficiency, and achieve good anti-SO2 poisoning ability, high The effect of catalytic activity

Inactive Publication Date: 2013-11-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to exist high active temperature, anti-SO- 2 sex, anti-H- 2 Problems such as poor O performance provide a Fe-ZSM-5 catalyst for selective catalytic reduction of NOx and its preparation method, which can effectively solve the problem of low denitrification efficiency of existing catalysts and resistance to SO 2 sex, anti-H 2 O sex is not good and other issues

Method used

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  • Fe-ZSM-5 catalyst used in NOx selective catalytic reduction, and preparation method thereof
  • Fe-ZSM-5 catalyst used in NOx selective catalytic reduction, and preparation method thereof
  • Fe-ZSM-5 catalyst used in NOx selective catalytic reduction, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Fe-ZSM-5 (Si / (Fe+Al)=20, Fe:Al=1:1) catalyst

[0018] 36.6ml deionized water (H 2 O) into the three-necked flask; in the process of electric stirring, add 11.88g of TEOS and 2gTPABr to it, and stir for 5min to dissolve TPABr; 0.577g of iron source (Fe(NO 3 ) 3 9H 2 O) into the three-necked flask; 0.117gNaAlO 2 (According to Si / (Fe+Al)=20, Fe:Al=1:1) dissolved in 36.6ml of 0.5mol / l NaOH solution, slowly drop it into the three-necked flask with a constant pressure funnel; at this time , adjust the pH value to 13 with NaOH; seal and stir for 5 hours to obtain a sol, pour the sol into a 200ml stainless steel crystallization kettle lined with polytetrafluoroethylene, and age for 12 hours; put it into a homogeneous reactor, Rotary crystallization at 170°C for 24h; natural cooling, suction filtration and washing of the filter cake with deionized water until the pH of the filtrate is neutral, drying at 100°C for 6h, and calcining at 550°C for 6h to finally obtain...

Embodiment 2

[0019] Example 2: Fe-ZSM-5 (Si / (Fe+Al)=35, Fe:Al=1:1) catalyst

[0020] 32ml of deionized water (H 2 O) into the three-necked flask; in the process of electric stirring, add 10.40g of TEOS and 2gTPABr to it, and stir for 5min to dissolve TPABr; 0.2886g of iron source (Fe(NO 3 ) 3 9H 2 O) into the three-necked flask; 0.0586gNaAlO 2 (According to Si / (Fe+Al)=35, Fe:Al=1:1) dissolved in 32ml of 0.5mol / l NaOH solution, slowly drop it into the three-necked flask with a constant pressure funnel; at this time, Use NaOH to adjust the pH value to 13; seal and stir for 5 hours to obtain a sol, pour the sol into a 200ml stainless steel crystallization kettle lined with polytetrafluoroethylene, and age for 6 hours; put it into a homogeneous reactor, at 130 Rotary crystallization at ℃ for 6h; natural cooling, suction filtration and washing of the filter cake with deionized water until the pH of the filtrate is neutral, drying at 100°C for 6h, and then calcining at 550°C for 3h to f...

Embodiment 3

[0021] Example 3: Fe-ZSM-5 (Si / (Fe+Al)=35, Fe:Al=1:2) catalyst

[0022] 32ml of deionized water (H 2 O) into the three-necked flask; during electric stirring, add 10.40g of TEOS and 2gTPABr to it, and stir for 5min to dissolve TPABr; 0.1923g of iron source (Fe(NO 3 ) 3 9H 2 O) into the three-necked flask; 0.0781gNaAlO 2 (According to Si / (Fe+Al)=35, Fe:Al=1:2) dissolved in 32ml of 0.5mol / l NaOH solution, slowly drop it into the three-necked flask with a constant pressure funnel; at this time, Use NaOH to adjust the pH value to 13; seal and stir for 5 hours to obtain a sol, pour the sol into a 200ml stainless steel crystallization kettle lined with polytetrafluoroethylene, and age for 6 hours; put it into a homogeneous reactor, at 130 Rotational crystallization at ℃ for 6h; natural cooling, suction filtration and washing of the filter cake with deionized water until the pH of the filtrate is neutral, drying at 100°C for 6h, and calcining at 550°C for 6h to finally obtai...

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Abstract

The invention aims at problems of high activity temperature, poor anti-SO2 property, poor anti-H2O property, and the like of existing catalyst, and provides a Fe-ZSM-5 catalyst used in NOx selective catalytic reduction, and a preparation method thereof. With the catalyst, problems such as low denitration efficiency, poor anti-SO2 property, poor anti-H2O property, and the like of existing catalysts can be effectively solved. According to the invention, Fe-ZSM-5 is synthesized through a rotation hydrothermal method. Compared with existing technologies, the selectively reductive Fe-ZSM-5 catalyst has the advantages that: the catalyst has wide activity temperature window (with a conversion rate higher than 99%); nitrogen oxide high-efficiency catalytic removing can be realized within a temperature range of 240-390 DEG C; also, with the method, the prepared Fe-ZSM-5 catalyst has good SO2 poisoning resistance. Under an atmosphere with the existences of water vapor and SO2, the catalyst maintains high catalytic activity.

Description

technical field [0001] The invention belongs to the field of air pollution control technology and environmental protection catalytic materials, and in particular relates to a preparation method of Fe-ZSM-5 catalyst for selective catalytic reduction of NOx by partially replacing Al with Fe in situ. Background technique [0002] At present, NOx mainly comes from exhaust emissions from coal-fired power plants, and has become an important air pollutant after inhalable particulate matter and sulfur dioxide. Therefore, the NOx emission reduction technology has attracted the attention of various countries, and my country's power industry has also formulated an industry development plan for this issue, which has also become the top priority of power environmental protection during the "Twelfth Five-Year Plan" period. [0003] The control of NOx mainly adopts the post-combustion treatment method. At present, power plants usually use NH 3 Selective catalytic reduction proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/88B01D53/86B01D53/56
Inventor 曲虹霞马罗宁钟秦
Owner NANJING UNIV OF SCI & TECH