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Core-shell structure molecular sieve catalyst for cooperatively controlling NO and methylbenzene and preparation method

A core-shell structure and synergistic control technology, applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of poor sulfur resistance performance, limited application, poor activity of catalytic oxidation of toluene, etc., and achieve improved sulfur resistance performance , maintain the original characteristics, and facilitate the activation of O2 molecules

Active Publication Date: 2019-07-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Cu-SAPO-34 molecular sieve catalyst still has the following disadvantages: (1) poor sulfur resistance; (2) poor activity in catalytic oxidation of toluene
However, there is no relevant research to solve the above problems, which limits the better application of Cu-SAPO-34 molecular sieve catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the core-shell structure molecular sieve catalyst for synergistically controlling NO and toluene comprises the following steps:

[0024] (1) Immerse 5g SAPO-34 molecular sieve in 10mL 0.065mol / L copper nitrate solution, stir magnetically at room temperature for 5h; then dry at 50°C for 24h, calcinate at 550°C for 4h, grind and sieve to obtain Cu-SAPO-34;

[0025] (2) Disperse 100mg Cu-SAPO-34 powder in 100mL ethanol aqueous solution (50ml deionized water + 50ml absolute ethanol), stir for 10min;

[0026] (4) Add 1g of polyvinylpyrrolidone (PVP) powder and stir until completely dissolved, then add 0.04g of cerium nitrate and 0.06g of hexamethylenetetramine in sequence, and continue stirring for 10 minutes;

[0027] (5) Condensate and reflux at 60°C while stirring at constant temperature for 2h, centrifuge at 8000r, wash with deionized water and absolute ethanol, dry at 50°C for 12h, and then calcinate at 500°C for 3h in an inert aeration enviro...

Embodiment 2

[0029] The preparation method of the core-shell structure molecular sieve catalyst for synergistically controlling NO and toluene comprises the following steps:

[0030] (1) Immerse 5g SAPO-34 molecular sieve in 10mL 0.158mol / L copper nitrate solution, stir magnetically at room temperature for 5h; then dry at 50°C for 24h, calcinate at 550°C for 4h in an air atmosphere, grind and sieve to obtain Cu-SAPO-34;

[0031] (2) Disperse 100mg Cu-SAPO-34 powder in 100mL ethanol aqueous solution (50ml deionized water + 50ml absolute ethanol), stir for 10min;

[0032] (4) Add 1g of polyvinylpyrrolidone (PVP) powder and stir until completely dissolved, then add 0.08g of cerium nitrate and 0.06g of hexamethylenetetramine in sequence, and continue stirring for 10 minutes;

[0033](5) Condensate and reflux at 60°C while stirring at constant temperature for 2h, centrifuge at 8000r, wash with deionized water and absolute ethanol, dry at 50°C for 12h, and then calcinate at 500°C for 3h in an i...

Embodiment 3

[0035] The preparation method of the core-shell structure molecular sieve catalyst for synergistically controlling NO and toluene comprises the following steps:

[0036] (1) Immerse 5g SAPO-34 molecular sieve in 10mL 0.25mol / L copper nitrate solution, stir magnetically at room temperature for 5h; then dry at 50°C for 24h, calcinate at 550°C for 4h in air atmosphere, grind and sieve to obtain Cu-SAPO-34;

[0037] (2) Disperse 100mg Cu-SAPO-34 powder in 100mL ethanol aqueous solution (50ml deionized water + 50ml absolute ethanol), stir for 10min;

[0038] (4) Add 1g of polyvinylpyrrolidone (PVP) powder and stir until completely dissolved, then add 0.08g of cerium nitrate and 0.06g of hexamethylenetetramine in sequence, and continue stirring for 10 minutes;

[0039] (5) Condensate and reflux at 60°C while stirring at constant temperature for 2h, centrifuge at 8000r, wash with deionized water and absolute ethanol, dry at 50°C for 12h, and then calcinate at 500°C for 3h in an iner...

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PUM

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Abstract

The invention discloses a core-shell structure molecular sieve catalyst for cooperatively controlling NO and methylbenzene and a preparation method. The molecular sieve catalyst comprises a Cu-SAPO-34molecular sieve core and a CeO2 shell, wherein the Cu-SAPO-34 molecular sieve core is formed by loading CuO on an SAPO-34 molecular sieve, and the CeO2 shell is self-assembled on the surface of the Cu-SAPO-34 molecular sieve core. The catalyst comprises, in weight percent, 1%-3% of CuO, 15.0%-30% of CeO2 and the balance SAPO-34. The preparation method includes the steps: preparing Cu-SAPO-34 by an ion exchange method; wrapping the molecular sieve with the CeO2 by a self-assembly method; performing drying and inert nitrogen calcining to prepare the catalyst. According to the catalyst, active components can be more effectively dispersed, the hydrothermal stability of the catalyst can be improved, sulfur poisoning of the catalyst can be effectively prevented, the methylbenzene can be cooperatively controlled in denitration, and the hydrocarbon poisoning resistance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a core-shell structure molecular sieve catalyst and a preparation method for synergistically controlling NO and toluene, in particular to a core-shell structure Cu-SAPO-34@CeO 2 Molecular sieve catalyst and its preparation method. Background technique [0002] NO x It is extremely destructive to the natural environment and human health, and will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer hole effect, causing serious pollution; toluene is seriously harmful to the environment and can cause pollution to air, water environment and water sources , while toluene is highly toxic and seriously endangers human health. [0003] At present, the problem of pollution from mobile sources of motor vehicles in my country has become increasingly prominent and has become an important source of air pollution. Nitrogen oxides (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/94B01D53/56B01D53/72
CPCB01J29/85B01D53/94B01D2255/20761B01D2255/2065B01D2257/404B01D2257/7027Y02A50/20
Inventor 赵令葵王珠江李姣妮张俊丰蒋露
Owner XIANGTAN UNIV
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