Alkali metal regulated hierarchical pore Au/ZSM-5 catalyst as well as synthesis method and application thereof

A technology of ZSM-5 and synthesis method, which is applied in the field of air pollution control, can solve the problems of limitation, high price, easy aggregation and easy deactivation of active centers, etc., and achieve the effects of dispersion promotion, large specific surface area, and high cost

Active Publication Date: 2021-10-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, factors such as expensive precious metals and easy agglomeration and deactivation of the active center limit its further industrial application prospects.

Method used

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  • Alkali metal regulated hierarchical pore Au/ZSM-5 catalyst as well as synthesis method and application thereof
  • Alkali metal regulated hierarchical pore Au/ZSM-5 catalyst as well as synthesis method and application thereof
  • Alkali metal regulated hierarchical pore Au/ZSM-5 catalyst as well as synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] A method for synthesizing the multi-level porous Au / ZSM-5 catalyst regulated by alkali metals, using the mesoporous phase alkali leaching modification method and the active phase ethylene glycol reduction doping method, the specific technical steps are as follows:

[0025] (1) Mix 12-13g of tetrapropylammonium hydroxide (TPAOH) solution with 12.5-13.5g of tetraethyl orthosilicate (TEOS), heat to 80-85°C, stir at 650-800rpm for 24-26h to obtain a solution ;

[0026] (2) After the solution obtained in step (1) is cooled to room temperature, NaOH (0.24-0.26g), Al(NO 3 ) 3 9H 2 A mixed solution of O (0.45-0.47g) and deionized water (4-5mL). After homogenization, transfer to a Teflon reactor and crystallize at 170°C for 24-26 hours to obtain a solution;

[0027] (3) Centrifuge the solution obtained in step (2) at 9000-11000 rpm, wash the obtained solid with deionized water, dry at 100-120°C overnight, and calcinate in a muffle furnace at 550-600°C for 10-11h to obtain p...

Embodiment 1

[0036] Example 1 Synthesis of supported noble metal catalytic materials and supported dual-functional component catalytic materials by alkali leaching method ethylene glycol reduction doping method

[0037] Mix 12g tetrapropylammonium hydroxide (TPAOH) solution with 12.5g tetraethylorthosilicate (TEOS), heat to 80°C and stir at 700rpm for 24h, after cooling to room temperature, add dropwise under vigorous stirring From NaOH (0.24g), Al (NO 3 ) 3 9H 2 O (0.45g) and deionized water (4mL) mixed solution. After homogenization, it was transferred to a Teflon reactor, crystallized at 170°C for 24h, then centrifuged at 9000rpm, washed with deionized water, dried at 100°C overnight, and calcined in a muffle furnace at 550°C for 11h. The above product was dissolved in 0.2mol / L NaOH solution (35mL·g -1 Zeolite) was subjected to alkaline leaching, stirred at 650rpm for 10h, centrifuged at 9000rpm and dried at room temperature, and the obtained solid was the hollow-structured hierarch...

Embodiment 2

[0043] Embodiment 2 single metal Au supported catalytic material Au 0.5 / ZSM-5 Catalytic Degradation Activity and Stability Test of Acetone

[0044] The catalytic reaction was carried out in a fixed bed, the catalyst obtained in Example 1 was pressed into tablets, sieved (40-60 mesh), and 0.3 mL of the sieved catalytic material was weighed, activated at 200 ° C for 2 h, and acetone (acetone) was used as Probe gas, the concentration of reactants is controlled at 1500ppm, and the reaction space velocity is 60,000h -1 , the oxygen concentration is 20%, respectively test the catalytic activity of the catalyst at 140°C, 160°C, 180°C, 200°C, 220°C, 240°C, 260°C, 280°C, 300°C, the reaction products are passed through gas chromatography and On-line mass spectrometry monitoring analysis.

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Abstract

The invention discloses a supported bimetallic active phase catalyst and a synthesis method and application thereof.The bimetallic Au-K/ZSM-5 catalyst is synthesized by doping alkali metal, the charge state of an Au active phase is regulated and controlled by means of the specific electronic modulation function of alkali metal K, the Au active phase is converted into a high-reactivity cation state, and electron transfer between the molecular sieve carrier and precious metal is accelerated; and a large number of surface hydroxyl groups introduced through alkali metal doping cause oxygen specific coordination, K < + > and Au < + > are initiated to be associated with nearby-O,-OH and H2O, a stable [Au-O (OH) x-K] active interface is formed, and the supported bimetallic catalytic material with high reactivity is obtained. The catalytic material prepared by the invention has highly dispersed bimetallic active sites and shows excellent volatile oxygen-containing hydrocarbon low-temperature purification capacity. Meanwhile, the catalyst disclosed by the invention is simple in synthesis method, low in raw material price and good in industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to an alkali metal regulated multi-level porous Au / ZSM-5 catalyst, a synthesis method and an application. Background technique [0002] Volatile organic compounds (VOCs) generally refer to a class of organic compounds whose saturated vapor pressure exceeds 133.32Pa at room temperature. The World Health Organization (WHO, 1989) defines VOCs as a general term for volatile organic compounds whose melting point is lower than room temperature and boiling point is between 50-260°C. There are many kinds of VOCs, mainly including aliphatic hydrocarbons, oxygen-containing hydrocarbons, aromatic hydrocarbons and their derivatives, halogen-containing hydrocarbons, nitrogen-containing hydrocarbons, sulfur-containing hydrocarbons, etc. It is undoubted that most of the emitted VOCs will lead to the formation of secondary pollutants, triggering the generation of secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J35/10B01J37/02B01J37/06B01J37/16B01D53/72B01D53/86
CPCB01J29/44B01J35/1019B01J35/1038B01J37/0201B01J37/06B01J37/16B01J35/0013B01D53/8668B01J2229/186B01J2229/26B01D2257/708B01D2258/06Y02A50/20
Inventor 何炽董瑞姜泽宇马牧笛武雅妮
Owner XI AN JIAOTONG UNIV
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