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Copper-containing or iron-based SAPO molecular sieve SCR catalyst, as well as preparation method and application of catalyst

A molecular sieve and catalyst technology, which is applied in the preparation of molecular sieve-like microporous materials and its catalytic process application, can solve the problems of low denitrification efficiency of cold-start SCR technology, and the ability to resist hydrothermal shock cannot meet the demand, and achieve excellent activity and high temperature stability high performance, meet the requirements of wide activity window, and good low-temperature activity

Pending Publication Date: 2021-03-05
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The implementation of the Euro VI standard and the National V standard has put forward higher requirements for the SCR catalyst of the motor vehicle. For example, the catalyst has a wide activity temperature window in the SCR reaction, high N2 selectivity, high low temperature activity, and strong hydrothermal aging resistance. Solve the problem of low denitrification efficiency of cold start SCR technology
Obviously, the existing SCR catalysts are mainly medium-temperature and high-temperature catalysts, and there are few studies on low-temperature SCR catalysts, and the ability to resist hydrothermal shock is difficult to meet the demand.

Method used

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  • Copper-containing or iron-based SAPO molecular sieve SCR catalyst, as well as preparation method and application of catalyst
  • Copper-containing or iron-based SAPO molecular sieve SCR catalyst, as well as preparation method and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0037] (1) Slowly add 120g of phosphoric acid (85wt%) in 500g of water, then add 70g of pseudoboehmite, 20g of 40wt% silica sol, keep the temperature at 40°C, and stir for 2 hours; then add 6.5g of acetic acid monohydrate Copper, continue to stir for 1 hour; then add 60 g of triethylamine, stir for 30 minutes; then add 35 g of morpholine, add 20 g of cyclamate, stir for 1 hour to obtain a gel mixture. Transfer the gel mixture into a closed reaction kettle, heat up to 200°C for 2 hours, react at a constant temperature for 24 hours, cool to room temperature, filter, wash the obtained product twice with deionized water, and dry at 120°C for 10 hours to obtain organic Molecular sieve powder for templating agent. The molecular sieve powder was heated up to 550°C at a rate of 1°C / min and calcined for 4 hours in an air-circulating environment to obtain a Cu-SAPO molecular sieve catalyst precursor synthesized by hydrothermal method. N 2 Adsorption isotherm test BET specific surface ...

Embodiment 2

[0046] (1) Slowly add phosphoric acid (85wt%) 120g in 500g water, then add pseudoboehmite 75g, 40wt% silica sol 20g, constant temperature 40 ℃, after stirring for 2 hours; then add 11g of sulfurous acid heptahydrate Iron, continue stirring for 1 hour; then add 55 g of triethylamine and stir for 30 minutes; then add 20 g of tetraethylenepentamine and stir for 1 hour to obtain a gel mixture. Transfer the gel mixture into a closed reaction kettle, heat up to 200°C for 2 hours, react at a constant temperature for 24 hours, cool to room temperature, filter, wash the obtained product twice with deionized water, and dry at 120°C for 10 hours to obtain organic Molecular sieve powder for templating agent. The zeolite powder is heated to 550°C for 4 hours at a rate of 1°C / min in an air-circulating environment to obtain the Fe-SAPO molecular sieve catalyst precursor synthesized by hydrothermal method, N 2 Adsorption isotherm test BET specific surface area 635m 2 / g, the average pore di...

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Abstract

The invention relates to a preparation method of a copper and iron-based SAPO molecular sieve SCR catalyst, and belongs to the field of preparation of molecular sieve catalysts. The catalyst is characterized in that a molecular sieve carrier of the catalyst is an inorganic microporous molecular sieve material composed of silicon, phosphorus and aluminum; and the active metal of the catalyst is copper or iron. The preparation method of the copper and iron-based SAPO molecular sieve catalyst comprises three steps, namely, hydrothermal synthesis, impregnation and solid-phase exchange, and specifically comprises the following steps of: firstly, preparing SAPO-34, Fe-SAPO and Cu-SAPO molecular sieves by a hydrothermal reaction method; then impregnating Fe or Cu ions on the SAPO-34 molecular sieve by an isopyknic impregnation method; and finally, mixing Fe / Cu-SAPO-34 obtained by the impregnation method with the Fe / Cu-SAPO molecular sieve synthesized by the hydrothermal method and carrying out high-temperature solid-phase exchange to obtain the Fe or Cu-based SAPO molecular sieve SCR catalyst with high hydrothermal stability and high- and low-temperature activity.

Description

technical field [0001] The invention belongs to the preparation and application of molecular sieve microporous materials, and specifically relates to the preparation and application of silicoaluminophosphate molecular sieves and metal silicoaluminophosphate molecular sieve catalysts. Background technique [0002] With the rapid increase of the number of automobiles in our country, automobile exhaust has had a great impact on people's lives. The composition of automobile exhaust is complex. Nitrogen oxides (NOx) enter the body through the respiratory tract, causing serious damage to the respiratory tract, alveoli and bronchi. In addition, the nitrite formed in the alveoli can penetrate into the blood, causing blood vessels to expand and blood pressure to drop. Hypoxia etc. In addition, a large amount of NOx emissions will also lead to the destruction of the ozone layer, photochemical smog and greenhouse effect. Like SO2, it will lead to the formation of acid rain, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85F01N3/10
CPCB01J29/85F01N3/10B01J2229/18
Inventor 邵秘华赵宝刚宋成文孙涵孙玉清
Owner DALIAN MARITIME UNIVERSITY
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