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Preparation method of Cu-Fe-ZSM-5-attapulgite compound flue gas denitrification catalyst

A cu-fe-zsm-5-, 1.cu-fe-zsm-5-technology is applied in the field of preparing Cu-Fe-ZSM-5-attapulgite composite flue gas denitrification catalyst, which can solve the problem of high price and low reaction Problems such as high flue gas temperature, achieve low cost, increase adsorption and denitrification rate, and reduce production cost

Active Publication Date: 2013-12-18
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitrification catalysts for existing industrial applications are based on TiO 2 for the carrier load V 2 o 5 Active ingredients and WO 3 Auxiliary, there are disadvantages of high price and high reaction flue gas temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Attapulgite was calcined at 600°C for 2 hours, 3 mol / L hydrochloric acid solution was added according to the solid-liquid mass volume ratio of 1:4, stirred at 100°C for 12 hours, suction filtered, washed and dried to obtain acidified attapulgite; 8g acidified attapulgite , add 100mL 0.2mol / L NaOH solution, stir for 30min, then add 100mL 60g / L ethylenediamine solution, stir and age at room temperature for 24h, hydrothermal crystallization at 180°C for 48h, cooling, suction filtration, washing with water, drying, 550°C Calcined for 3 hours to obtain ZSM-5 zeolite; add 5g of ZSM-5 zeolite and 15g of attapulgite to 50mL copper nitrate and ferric nitrate metal salt solution, stir for 1 hour, then heat and reflux for 2 hours, dry, extrude, and calcined at 500°C Prepare Cu-Fe-ZSM-5-attapulgite composite flue gas denitrification catalyst in 3h; copper nitrate is 9.44% (1.888g) of the total mass of ZSM-5 zeolite and attapulgite, and iron nitrate is the total mass of ZS...

Embodiment 2

[0013] Example 2: Attapulgite was calcined at 600°C for 2 hours, 3mol / L hydrochloric acid solution was added according to the solid-liquid mass volume ratio of 1:4, stirred at 100°C for 12h, suction filtered, washed and dried to obtain acidified attapulgite; 8g acidified attapulgite , add 100mL 0.3mol / L NaOH solution and stir for 30min, then add 100mL 40g / L n-butylamine solution, stir and age at room temperature for 24h, hydrothermal crystallization at 180°C for 48h, cooling, suction filtration, washing with water, drying, 550°C Calcined for 3 hours to obtain ZSM-5 zeolite; add 5g of ZSM-5 zeolite and 15g of attapulgite to 50mL copper nitrate and ferric nitrate metal salt solution, stir for 1 hour, then heat and reflux for 2 hours, dry, extrude, and calcined at 500°C Prepare Cu-Fe-ZSM-5-attapulgite composite flue gas denitrification catalyst in 3h; copper nitrate is 12.58% (2.516g) of the total mass of ZSM-5 zeolite and attapulgite, and iron nitrate is the total mass of ZSM-5 z...

Embodiment 3

[0014] Example 3: Attapulgite was calcined at 600°C for 2 hours, 3 mol / L hydrochloric acid solution was added according to the solid-liquid mass volume ratio of 1:4, stirred at 100°C for 12 hours, suction filtered, washed and dried to obtain acidified attapulgite; 8g acidified attapulgite , add 100mL 0.2mol / L NaOH solution, stir for 30min, then add 100mL 20g / L tetrapropylammonium bromide solution, stir and age at room temperature for 24h, hydrothermal crystallization at 180°C for 48h, cooling, suction filtration, washing with water, drying , Calcined at 550°C for 3 hours to obtain ZSM-5 zeolite; 5g of ZSM-5 zeolite and 15g of attapulgite were added to 50mL of metal salt solution of copper nitrate and iron nitrate, stirred for 1 hour, then heated to reflux for 2 hours, dried, extruded, Cu-Fe-ZSM-5-attapulgite composite flue gas denitrification catalyst was prepared by calcining at 500°C for 3 hours; copper nitrate was 15.11% (3.022g) of the total mass of ZSM-5 zeolite and attapu...

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PUM

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Abstract

The invention discloses a preparation method of a Cu-Fe-ZSM-5-attapulgite compound flue gas denitrification catalyst. The preparation method comprises the following steps: firstly, preparing acidified attapulgite from attapulgite through burning, hot acidic liquor treatment, suction filtration and water washing; secondly, adding an alkali liquor and an organic template agent, and carrying out aging, hydrothermal crystallization, suction filtration, water washing, drying and calcining to prepare ZSM-5 zeolite; next, mixing the ZSM-5 zeolite with the attapulgite and a mixed solution of a copper salt and an iron salt and stirring, carrying out heating reflux treatment, and finally, carrying out drying, strip extrusion and calcining moulding to prepare the Cu-Fe-ZSM-5-attapulgite compound flue gas denitrification catalyst. The preparation method is characterized in that the attapulgite carrier and a viscosity characteristic are utilized, low-cost ZSM-5 zeolite is added, the adsorption characteristic of the ZSM-5 to NO is utilized and a cheap iron salt is introduced so that the cost is reduced, and consequently, the obtained catalyst shows excellent denitrification activity at 250-330 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a flue gas denitrification catalyst using attapulgite as a raw material, specifically, a kind of attapulgite is calcined, acidified, and in-situ hydrothermally synthesized ZSM-5 zeolite, and then attapulgite, copper salt and iron are added A method for preparing a Cu-Fe-ZSM-5-attapulgite composite flue gas denitrification catalyst from a salt mixture. Background technique [0002] NO x It is one of the main pollutants in the atmosphere, and its sources are mainly motor vehicle exhaust and emissions from coal-fired power plants. With the country's emphasis on environmental protection, its emission standards are becoming more and more stringent. Selective reduction (SCR) denitrification technology is the most widely used, most economical and efficient NO x Control Technology. The core of this technology is the denitrification catalyst. The denitrification catalysts for existing industrial applications ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01D53/90B01D53/56
CPCY02C20/10
Inventor 蒋金龙杨勇陈韬宇钱运华固旭陈静
Owner HUAWEI TEHCHNOLOGIES CO LTD
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