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Preparation method and application of Fe and Cu composite molecular sieve catalyst

A composite molecular sieve and catalyst technology, which is applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of not having a reaction temperature window and being unable to meet the complex and changeable reaction conditions in the field of environmental catalysis, so as to reduce pollution and expand Operating temperature window, effect of improving performance

Active Publication Date: 2015-02-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, under the conditions of no sulfur, no dust, and no water, many catalysts have shown excellent NOx purification capabilities, but most of them do not have a wide reaction temperature window and cannot meet the complex and changeable reactions in the field of environmental catalysis. condition

Method used

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  • Preparation method and application of Fe and Cu composite molecular sieve catalyst
  • Preparation method and application of Fe and Cu composite molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of the catalyst of the present embodiment comprises the following steps:

[0020] Step 1. Preparation of Fe molecular sieve catalyst

[0021] Measure 250mL of deionized water, add 8g of ZSM-5 molecular sieve, the SiO 2 / Al 2 O 3 is 23, stir at room temperature; then add 3 g of FeCl according to the stoichiometric ratio 2 , and stirred at room temperature for 24 hours to carry out ion exchange; then washed with deionized water and suction filtered, and the obtained filter cake was first dried in an oven for 12 hours; finally, it was calcined in a muffle furnace at 550 °C for 4 hours to obtain Fe-ZSM-5 molecular sieve catalyst.

[0022] Step 2. Preparation of Cu molecular sieve catalyst

[0023] Measure 250mL of deionized water, add 8g of ZSM-5 molecular sieve, the SiO 2 / Al 2 O 3 is 23, stir at room temperature; then add 3 g of Cu(NO) according to the stoichiometric ratio 3 ) 2 , stirred at room temperature for 24 hours, and carried out io...

Embodiment 2

[0030] The preparation method of the catalyst of the present embodiment comprises the following steps:

[0031] Step 1. Preparation of Fe molecular sieve catalyst

[0032] Measure 250mL of deionized water, add 8g of ZSM-5 molecular sieve, the SiO 2 / Al 2 O 3 is 23, stir at room temperature; then add 3 g of FeCl according to the stoichiometric ratio 2 , and stirred at room temperature for 24 hours to carry out ion exchange; then washed with deionized water and suction filtered, and the obtained filter cake was first dried in an oven for 12 hours; finally, it was calcined in a muffle furnace at 550 °C for 4 hours to obtain Fe-ZSM-5 molecular sieve catalyst.

[0033] Step 2. Preparation of Cu molecular sieve catalyst

[0034]Measure 250mL of deionized water, add 8g of ZSM-5 molecular sieve, the SiO 2 / Al 2 O 3 is 23, stir at room temperature; then add 3 g of Cu(NO) according to the stoichiometric ratio 3 ) 2 , stirred at room temperature for 24 hours, and carried out ion...

Embodiment 3

[0041] The preparation method of the catalyst of the present embodiment comprises the following steps:

[0042] Step 1. Preparation of Fe molecular sieve catalyst

[0043] Measure 250mL of deionized water, add 8g of ZSM-5 molecular sieve, the SiO 2 / Al 2 O 3 is 23, stir at room temperature; then add 3 g of FeCl according to the stoichiometric ratio 2 , and stirred at room temperature for 24 hours to carry out ion exchange; then washed with deionized water and suction filtered, and the obtained filter cake was first dried in an oven for 12 hours; finally, it was calcined in a muffle furnace at 550 °C for 4 hours to obtain Fe-ZSM-5 molecular sieve catalyst.

[0044] Step 2. Preparation of Cu molecular sieve catalyst

[0045] Measure 250 mL of deionized water, add 8 g of SSZ-13 molecular sieve, and stir at room temperature; then add 3 g of Cu(NO) according to the stoichiometric ratio 3 ) 2 , and stirred at room temperature for 24 hours to perform ion exchange; then washed w...

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Abstract

The invention discloses a preparation method and application of a Fe and Cu composite molecular sieve catalyst. A Fe molecular sieve catalyst and a Cu molecular sieve catalyst are firstly prepared; subsequently the Cu molecular sieve catalyst and the Fe molecular sieve catalyst are serially compounded mechanically so as to obtain the Fe and Cu composite molecular sieve catalyst; and furthermore, the selective catalysis is carried out according to the prepared catalyst so as to recover the oxynitride, wherein the removing efficiency of NOx is more than 95%, so that the catalyst has good practical application prospect.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a preparation method and application of a Fe and Cu composite molecular sieve catalyst, which is used for the selective catalytic reduction of nitrogen oxides by ammonia gas, and is suitable for diesel engines, lean-burn gasoline engines and industrial production. It involves NOx purification under oxygen-enriched conditions, such as NOx treatment in flue gas from coal-fired power plants, smelters or oil refineries. Background technique [0002] With the rapid development of my country's economy and the continuous growth of energy consumption, coal, fuel, and gas-based energy consumption consumes a large amount of fossil fuels, and the hazards such as nitrogen oxides (NOx) emitted into the atmosphere continue to intensify. At present, the air pollution in some large cities in my country has shown the characteristics of regional complex, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J29/46B01J29/80B01D53/90B01D53/94B01D53/56
CPCY02A50/20
Inventor 李俊华马磊傅立新郝吉明
Owner TSINGHUA UNIV
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