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Copper-iron-containing bimetal porous catalyst and preparation method thereof

A copper-iron bimetallic and porous catalyst technology, applied in the field of flue gas denitrification, can solve the problems of poisoning and deactivation, narrow temperature window, difficult to reach the working state, etc., and achieve excellent nitrogen oxide purification effect

Inactive Publication Date: 2018-05-25
中瑞天净环保科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its narrow temperature window, no matter the high temperature or low temperature denitrification catalyst, it is difficult to achieve the best working state when the flue gas temperature and flow rate are unstable, showing low catalytic conversion efficiency and poisoning deactivation phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the preparation of 1.2% CuFe-Y catalyst

[0019] 1) Using 1M copper chloride / iron bimetallic solution as the precursor, introduce CuFe into Y molecular sieve by ion exchange method. The exchange method is: weigh 100g of Y sample and place it in a 250ml round bottom flask, and then add it according to the metering ratio 50ml of copper chloride / iron bimetallic solution, then add deionized water to 200ml, stir in a water bath at 80°C for 15h, then suction filter, wash and dry. The above steps were repeated twice, and finally the measured CuFe content was 1.2%, and then calcined at 550° C. for 10 h to obtain 1.2% CuFe-Y.

[0020] 2) The 1.2% CuFe-Y catalyst is directly extruded to obtain a self-supporting monolithic catalyst.

Embodiment 2

[0021] Embodiment 2: Preparation of 3.1% CuFe-Y catalyst

[0022] 1) Using 1M copper sulfate / iron bimetallic solution as a precursor, introduce CuFe into Y by ion exchange method. The exchange method is: weigh 100g of Y sample and place it in a 250ml round bottom flask, and then add 50ml of Copper sulfate / iron bimetallic solution, then add deionized water to 200ml, stir in 80°C water bath for 18h, then suction filter, wash and dry. The above steps were repeated twice, and finally the measured CuFe content was 3.1%, and then calcined at 550° C. for 10 h to obtain 3.1% CuFe-Y.

[0023] 2) The 3.1% CuFe-Y catalyst is directly extruded to obtain a self-supporting monolithic catalyst.

Embodiment 3

[0024] Embodiment 3: the application of CuFe-Y catalyst in nitrogen oxide ammonia selective catalytic reduction

[0025] Put 5 g of 1.2% CuFe-Y self-supporting monolithic catalyst into a stainless steel fixed-bed reactor with a length of 50 cm and an internal diameter of 2 cm. The catalyst is placed in the central constant temperature zone of the reactor. At the reaction inlet: nitrogen oxides=1000 ppm; =1100ppm; Oxygen = 5%; Water vapor = 12%; Sulfur dioxide = 30ppm; Reaction temperature = 150~500°C, reaction space velocity is 30000h -1 . The product was analyzed online with a nitrogen oxide analyzer (NOVAL PLUS multifunctional flue gas analyzer). Catalytic results show that: 1.2% CuFe-Y has excellent NH 3 -SCR performance, after the catalytic purification process, the conversion rate of nitrogen oxides can reach 90% at 350°C.

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Abstract

The invention discloses a copper-iron-containing bimetal porous catalyst and a preparation method thereof. The catalyst composition is expressed as CuFezSixAlO2(x+), z is equal to 0.1 to 5 percent, x / is equal to 1 to 50, z / is equal to 0.1 to 1. The preparation method comprises the following steps: taking a Y molecular sieve as a carrier and taking copper iron bimetallic salt as an active ingredient precursor to prepare an aqueous solution; introducing the copper iron bimetallic active ingredient by using a liquid phase ion exchange method, and regulating the weight percentage of copper ironbimetal to 0 to 5 percent by controlling exchange times and time; drying and calcining samples to form catalyst powder; then carrying out direct high-pressure extruding molding or coating on the powder to the substrate surface with a fixed shape to obtain an integral catalyst. When the copper-iron-containing bimetal porous catalyst is used in the reaction of selective catalytic reduction of nitrogen oxide by ammonia, the reaction temperature is 150 to 500 DEG C, the ammonia is used as a reducing agent, the total flow of gas is controlled at 100 to 400ml / min and the airspeed is 10000 to 128000h<-1>. The purification efficiency of the nitrogen oxide is 90 to 100 percent.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a low-temperature flue gas denitrification catalyst with silica-alumina zeolite molecular sieve loaded with copper-iron bimetallic as an active component and a preparation method thereof, as well as a method for selective catalytic reduction (SCR) of flue gas. ) application in denitrification. Background technique [0002] Nitrogen oxides (NO X ) is one of the main harmful substances that pollute the atmosphere. As a primary pollutant, it itself will cause harm to human health. It can irritate people's eyes, nose, throat and lungs, and easily cause people to suffer from respiratory diseases. What's more serious is that NOx will also produce a variety of secondary pollution, such as acid rain and photochemical pollution. Combustion of fossil fuels (coal, oil, natural gas) produces a large amount of NO X One of the main ways, especially the nitrogen oxides emitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/10B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J29/106B01D2251/2062B01D2258/0283B01J35/00B01J35/30
Inventor 杨广才张祖锋
Owner 中瑞天净环保科技(天津)有限公司
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