Supported hierarchical pore Beta molecular sieve based catalyst and preparation method and application thereof

A multi-stage pore and load-type technology, applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of unfavorable soot particle diffusion and mass transfer, low specific surface area of ​​metal oxides, and limited agglomeration of active components problems such as bulk, to achieve good hydrothermal stability, cost and energy savings, and good catalytic activity

Active Publication Date: 2014-04-02
中科西卡思(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, metal oxides have a low specific surface area, and the content of active components loaded is limited and easily lead to the formation of agglomerates; zeolite molecular sieves are not conducive to the removal of large-sized soot particles in diesel vehicle exhaust due to the limitation of the size

Method used

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  • Supported hierarchical pore Beta molecular sieve based catalyst and preparation method and application thereof
  • Supported hierarchical pore Beta molecular sieve based catalyst and preparation method and application thereof
  • Supported hierarchical pore Beta molecular sieve based catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Add 0.012mol tetraethylammonium hydroxide (TEAOH) and 0.002mol NaCl to 6mL water, stir well at room temperature and then add 0.025mol SiO 2, stirred until clear, and then added 2 mL of an aqueous solution containing 0.001 mol of sodium aluminate to obtain a mixed aqueous solution. Then, 2 mL of a surfactant cetyltrimethylammonium bromide (CTAB) aqueous solution with a concentration of 0.05 mol / L was added to the mixed aqueous solution, stirred vigorously at 80° C. for 3 hours, and then the resulting solution was charged into polytetrafluoroethylene In a vinyl fluoride hydrothermal kettle, carry out hydrothermal crystallization reaction at 150°C for 24 hours, centrifuge, wash the sample, dry at 100°C overnight, and then roast at 550°C for 8 hours to remove attached inorganic salts and organic matter; the roasted The powder was dispersed in 20mL of 0.5M NaOH aqueous solution, treated in a water bath at 80°C for 4 hours, centrifuged and dried at 150°C to obtain a Na-loaded...

Embodiment 2

[0040] Take 1 g of Na-mBeta powder in Example 1, mix it with 50 mL of 0.5 mol / L copper nitrate solution, stir for 4 hours in a water bath at 80°C for ion exchange, centrifuge after the reaction, and wash until there are no metal ions in the lotion , dried at 100°C; then repeat the above ion exchange process 3 times. Finally, it was calcined at 550° C. for 8 hours to obtain a Cu-loaded hierarchical porous Beta molecular sieve material, which was denoted as Cu-mBeta.

Embodiment 3

[0042] Take 1 g of Na-mBeta powder in Example 1, mix it with 50 mL of 0.1 mol / L potassium permanganate solution, stir for 4 hours in a water bath at 80°C for ion exchange, centrifuge after the reaction, and wash until there is no Metal ions were dried at 100°C; then the above ion exchange process was repeated three times. Finally, it was calcined at 550° C. for 8 hours to obtain a Mn-supported hierarchical porous Beta molecular sieve material, which was denoted as: Mn-mBeta.

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Abstract

The invention discloses a supported hierarchical pore Beta molecular sieve based catalyst. NOx and carbon cigarette pellets in tail gas of a diesel vehicle can be catalytically removed simultaneously under low catalytic reaction temperature, and the catalyst has excellent reusability and the capability of resisting poisoning caused by CO oxidation in humidity.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a supported multi-level porous Beta molecular sieve catalyst and a preparation method and application thereof. Background technique [0002] Compared with gasoline vehicles, diesel vehicles have high thermal efficiency, economy, long life and cruising distance, which can reduce greenhouse gas CO 2 emissions, so the diesel engine has been widely used since its inception. However, the diesel exhaust exhaust is an oxygen-rich atmosphere containing high concentrations of NO x And soot particles (soot), which greatly endanger human health. Among them, the removal of soot particles has always been a difficult problem in the treatment of diesel engine exhaust. The thermodynamic oxidation temperature of soot particles is above 600°C, while the exhaust temperature of diesel engines is usually lower than 400°C. The study found that NO oxidation product NO 2 As ...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J35/04B01D53/94B01D53/56
Inventor 周晓霞陈航榕施剑林
Owner 中科西卡思(苏州)科技发展有限公司
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