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A step-by-step and partitioned preparation method of a NOx adsorption-reduction bifunctional catalyst

A dual-function catalyst and metal technology, applied in the direction of separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of unreachable adsorption performance and reduced NOx removal efficiency, etc., to achieve weakened mutual interference, efficient storage and efficient reduction Effect

Active Publication Date: 2016-10-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the loading of high active components on porous media can achieve high NOx catalytic reduction performance, but its adsorption performance cannot meet the requirements of the above patents, and the addition of active components to improve adsorption performance often greatly reduces NOx removal. efficiency

Method used

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  • A step-by-step and partitioned preparation method of a NOx adsorption-reduction bifunctional catalyst

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Effect test

Embodiment 1

[0024] The method for preparing NOx adsorption and reduction bifunctional catalyst step by step and partition, specifically includes the following steps:

[0025] (1) Using the porous medium powder ZSM-5 series molecular sieve as the carrier, the inorganic salt BaCl 2 Prepared as an aqueous solution of inorganic salt (5% w.t.), the organic salt Fe(AA) of the reduced metal 3 Prepare organic salt solution (28g / 100ml, solvent benzene);

[0026] (2) Place the carrier in an inorganic salt solution of 2 times the volume of the storage metal, immerse it for 24 hours, then wash it twice with deionized water, and finally place it in an oven at 110°C for 24 hours to obtain a carrier loaded with the storage metal powder;

[0027] (3) Place the carrier powder loaded with stored metal in the organic salt solution of reduced metal twice its volume, soak for 24 hours, then recover the organic solvent by evaporation, and dry the remaining catalyst in an oven at 100°C for 12 hours , and fin...

Embodiment 2

[0029] The method for preparing NOx adsorption and reduction bifunctional catalyst step by step and partition, specifically includes the following steps:

[0030] (1) With porous media powder alumina powder as carrier, the inorganic salt KCl of storage metal is mixed with inorganic salt solution (5%wt), the organic salt nickel oxalate of reduction metal is mixed with organic salt solution (29.4g / 100ml, solvent toluene);

[0031] (2) Place the carrier in an inorganic salt solution of 1.5 times the volume of the storage metal, immerse it for 30 hours, then wash it with deionized water for 3 times, and finally place it in an oven at 120°C for 20 hours to obtain a carrier loaded with the storage metal powder;

[0032] (3) Put the carrier powder loaded with stored metal in the organic salt solution of reduced metal of 1 times its volume, immerse for 20 hours, then recover the organic solvent by evaporation, and dry the remaining catalyst in an oven at 90°C for 20 hours , and fina...

Embodiment 3

[0034] The method for preparing NOx adsorption and reduction bifunctional catalyst step by step and partition, specifically includes the following steps:

[0035] (1) With porous medium powder SSZ-13 series molecular sieve as carrier, the inorganic salt KCl of storage metal is mixed with inorganic salt solution (5%wt), the organic salt nickel oxalate of reduction metal is mixed with organic salt solution (29.4g / 100ml, solvent toluene);

[0036] (2) Place the carrier in 3 times the volume of the inorganic salt solution of the storage metal, soak it for 40 hours, then wash it with deionized water 4 times, and finally place it in an oven at 130°C for 20 hours to obtain a carrier loaded with the storage metal powder;

[0037] (3) Place the carrier powder loaded with stored metal in the organic salt solution of reduced metal 1.5 times its volume, soak for 20 hours, then recover the organic solvent by evaporation, and dry the remaining catalyst in an oven at 90°C for 24 hours , a...

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Abstract

The invention relates to a step-wise and region-wise preparation method for an NOx storage reduction dual-functional catalyst. The preparation method comprises the following steps: taking porous medium powder as a carrier; soaking the carrier in an aqueous inorganic salt solution of storage metal, washing, and drying to obtain storage metal-loaded carrier powder; then soaking the storage metal-loaded carrier powder in an organic salt solution of reduction metal, evaporating, drying, and roasting and loading the reduction metal to prepare the NOx storage reduction dual-functional catalyst. A step-wise and region-wise metal loading method reduces mutual interference of the storage metal and the reduction metal on the surface of the catalyst, so that efficient storage and efficient reduction of NOx can be realized to the maximum extent.

Description

technical field [0001] The invention relates to a preparation method of a NOx adsorption-reduction dual-function catalyst, which uses metals such as Fe, Ba, and Ce to be loaded on porous media for NOx x The adsorption-catalytic reduction method belongs to the technical field of air pollution control technology and environmental protection catalytic material technology. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants, which can form acid rain or acid mist combined with hydrocarbons to form photochemical smog and destroy the ozone layer. Currently, more than 60% of nitrogen oxides come from flue gas from coal combustion. At present, the most widely used, mature and effective flue gas denitrification technology in the world is NH 3 -SCR technology (selective catalytic reduction of NOx with ammonia as reducing agent). NH 3 -SCR technology has high denitrification efficiency, is mature and reliable, and has strong adaptability. It is esp...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/78B01J23/889B01J23/66B01J23/68B01J29/46B01J29/44B01J29/48B01J29/74B01J29/76B01J29/78B01J20/08B01J20/18B01J20/20B01D53/86B01D53/56
Inventor 程星星王鲁元王志强马春元张兴宇王涛
Owner SHANDONG UNIV
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