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Nano-gold catalyst and preparation method thereof

A catalyst and nano-gold technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of lack of catalytic activity and limited catalytic efficiency of catalysts, so as not to be easily destroyed, ensure activity, and improve The effect of mechanical strength

Inactive Publication Date: 2014-11-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon dioxide is an inert oxide, which does not have catalytic activity itself, and its role is only a protective layer, which limits the catalytic efficiency of the catalyst to a large extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At 25°C, add 1.5 g of 4 wt % tetrachloroauric acid aqueous solution into the reaction kettle, add 66 mL of trisodium citrate aqueous solution with a concentration of 3 mol / L, and react for 2 hours, then add 1.5 g of 0.1 g / mL polyvinylpyrrolidone aqueous solution, continue to react for 18h, and centrifuge to obtain gold sol;

[0022]Add 150mL of ethanol and 10mL of deionized water to the above-prepared gold sol, and ultrasonically disperse for 1 hour to obtain a gold sol ethanol-water mixture. Use 0.1g / mL sodium hydroxide solution to adjust the pH of the mixture to 8.5, and add 3g of orthosilicon Acid tetraethyl ester, stirred at 40°C for 0.5h, added 1.3g of sodium metaaluminate, reacted at 90°C for 16h, filtered, washed the filter cake with 150mL of deionized water and 50mL of ethanol, and dried in vacuum at 60°C for 8h to obtain Catalyst precursor; add 58mL of deionized water and the catalyst precursor into a hydrothermal kettle, add 1.2g of hexadecyltrimethylammonium ...

Embodiment 2

[0025] At room temperature, 1.5 g of 4 wt % tetrachloroauric acid aqueous solution was added to the reaction kettle, and 66 mL of sodium borohydride aqueous solution with a concentration of 3 mol / L was added. After 2 hours of reaction, 1.5 g of a concentration of 0.1 g / mL poly Vinylpyrrolidone aqueous solution, continue to react for 18h, and centrifuge to obtain gold sol;

[0026] Add 150mL of ethanol and 10mL of deionized water to the above-prepared gold sol, and disperse it ultrasonically for 1 hour to obtain a gold sol ethanol-water mixture. Adjust the pH of the mixture to 8.5 with 0.1g / mL potassium hydroxide solution, and add 3g of orthosilicon Acetate tetraethyl ester, stirred at 40°C for 0.5h, added 1.3g of aluminum nitrate, reacted at 90°C for 16h, filtered, washed the filter cake with 150mL of deionized water and 50mL of ethanol, and dried in vacuum at 60°C for 8h to obtain the catalyst precursor body; add 58mL deionized water and the catalyst precursor into a hydrothe...

Embodiment 3

[0029] At 20°C, add 1.5g of 4wt% tetrachloroauric acid aqueous solution into the reaction kettle, add 22mL of trisodium citrate with a concentration of 3mol / L and 44mL of sodium borohydride mixture with a concentration of 3mol / L After reacting for 2 hours, add 1.5 g of polyvinylpyrrolidone aqueous solution with a concentration of 0.1 g / mL, continue the reaction for 18 hours, and centrifuge to obtain gold sol;

[0030] Add 150mL of ethanol and 10mL of deionized water to the above-prepared gold sol, and disperse it ultrasonically for 1 hour to obtain a gold sol ethanol-water mixture. Use 0.1g / mL sodium hydroxide solution to adjust the pH of the mixture to 8.5, and add 3g of Hexa base disiloxane, stirred at 40°C for 0.5h, added 1.3g of sodium metaaluminate, reacted at 90°C for 16h, filtered, washed the filter cake with 150mL of deionized water and 50mL of ethanol, and dried in vacuum at 60°C for 8h. To obtain the catalyst precursor; add 58mL of deionized water and the catalyst pr...

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PUM

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Abstract

The invention relates to a nano-gold catalyst and a preparation method thereof. The preparation method of the catalyst comprises the following steps: reducing an acid containing gold into nano-Au; mixing the nanoAu with a polymer bonding agent, adding a silicon source and an aluminum source for reacting to obtain a catalyst precursor; and adding a template agent into the catalyst precursor for performing a hydrothermal reaction to obtain the nano-gold catalyst with a core-shell structure, wherein the core is the nano-Au, and the shell is an A type, X type, Y type or ZSM-5 type silicon-aluminum mesoporous molecular sieve of one or more of compounds. The catalyst has high thermal stability and high catalytic activity.

Description

technical field [0001] The invention relates to a nano-gold catalyst and a preparation method thereof, belonging to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Gold has limited reserves and has unique anti-oxidation and anti-corrosion properties. It has always been used as a material for jewelry and currency preservation. In recent years, with the increasing demand for automobile exhaust treatment and new energy development, people are paying more and more attention to the research of nano-precious metal catalysts. Among them, nano-gold catalysts have gradually become the most widely studied nano-noble metal catalysts due to their excellent catalytic performance in catalytic oxidation and catalytic hydrogenation. Compared with the traditional supported catalysts, the metal particles of nano-Au catalysts are smaller, so they have higher catalytic reactivity. [0003] CN102632232A patent discloses a method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J29/12B01J29/74C07C215/76C07C213/02B82Y30/00B82Y40/00
Inventor 张一卫向三明周钰明盛晓莉张泽武续元妹
Owner SOUTHEAST UNIV
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