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Method for preparing load type nanogold catalyst

A nano-gold and catalyst technology, which is applied in the field of preparation of supported nano-gold catalysts, can solve problems such as single gold anchor point properties, catalyst catalytic activity, catalyst stability constraints, etc., and achieve good catalytic activity and stability

Inactive Publication Date: 2015-03-11
SHUNDE POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The inventors previously synthesized a bridged silicone precursor containing ionic liquid fragments and thioethers and compounded it into mesoporous materials, due to the The components are uniformly distributed in the material, and the gold nanoparticles can be highly dispersed in it, and the obtained nano-gold catalyst exhibits extremely high catalytic activity and stability in the epoxidation of olefins with hydrogen peroxide as the oxidant; however, the above catalysts The synthesis of bridged organosilicon precursors containing ionic liquid fragments and thioethers is very complicated, and the property of the gold anchor point is single, and the catalytic activity and stability of the catalyst are mutually restricted.

Method used

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  • Method for preparing load type nanogold catalyst
  • Method for preparing load type nanogold catalyst
  • Method for preparing load type nanogold catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of supported nanometer gold catalyst comprises the steps:

[0025] step one

[0026] at 60 o Under the condition of C, take 19% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form cloudy solution A;

[0027] step two

[0028] Prepare 15% formaldehyde into a 37 wt.% formaldehyde aqueous solution, then mix it with deionized water to obtain a cloudy solution B, then adjust the pH value of solution B to 8.7 with sodium hydroxide aqueous solution, and then add 11% Melamine and 7% thiourea, at 60 o C was stirred for 2 hours to obtain solution C;

[0029] step three

[0030] Pour solution A into solution C and stir for 2.5 hours to obtain solution D. During the stirring of solution D, dissolve 40% water glass in deionized water and stir at room temperature for about 30 minutes to obtain solution E. In solution D Quickly pour 8% glacial acetic acid, under vigorous stirring, immediately pour solution E into ...

Embodiment 2

[0034] The preparation method of supported nanometer gold catalyst is characterized in that comprising the steps:

[0035] step one

[0036] at 70 o Under the condition of C, take 23% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form cloudy solution A;

[0037] step two

[0038] Prepare 17% formaldehyde into a formaldehyde aqueous solution with a concentration of 37 wt.%, then mix it with deionized water to obtain a cloudy solution B, then adjust the pH value of solution B to 8.5-9.0 with aqueous sodium hydroxide solution, and then add 9 % of melamine and 6% of thiourea, at 50 o C was stirred for 3 hours to obtain solution C;

[0039] step three

[0040] Pour solution A into solution C and stir for 3 hours to obtain solution D. During the stirring of solution D, dissolve 38% water glass in deionized water and stir at room temperature for about 35 minutes to obtain solution E. In solution D Quickly pour 7% glacial acetic acid, ...

Embodiment 3

[0044] The preparation method of supported nanometer gold catalyst is characterized in that comprising the steps:

[0045] step one

[0046] at 50 o Under the condition of C, take 15% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form cloudy solution A;

[0047] step two

[0048] Prepare 13% formaldehyde into a 37 wt.% formaldehyde aqueous solution, mix it with deionized water to obtain a cloudy solution B, adjust the pH value of solution B to 8.5-9.0 with sodium hydroxide aqueous solution, and then add 13 % of melamine and 8% of thiourea, at 70 o C was stirred for 1 hour to obtain solution C;

[0049] step three

[0050] Pour solution A into solution C and stir for 2 hours to obtain solution D. During the stirring of solution D, dissolve 42% water glass in deionized water and stir at room temperature for about 25 minutes to obtain solution E. In solution D Quickly pour 9% glacial acetic acid, under vigorous stirring, immediately...

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Abstract

The invention relates to a method for preparing a load type nanogold catalyst, which comprises the following steps: weighing a polyoxypropylene / polyoxyethylene copolymer solution and dissolving in deionized water to form a haze-free solution A; mixing a formaldehyde aqueous solution with concentration of 37wt.% and deionized water to obtain a haze-free solution B, then adding melamine and thiourea for stirring to obtain a solution C; dumping the solution A in the solution C for stirring to obtain a solution D, dissolving soluble glass in deionized water to obtain a solution E, rapidly dumping the solution D in acetate acid gracial, dumping the solution E in the solution D, performing microwave heating and soxhlet extraction by ethanol to obtain a mesoporous organic-inorganic interpenetrating network material, and dispersing in deionized water, then adding a HAuCl4 aqueous solution with concentration of 0.24M drop by drop, using NaOH with concentration of 1M to adjust pH value to 7-8, stirring, and filtering to obtain the load type nanogold catalyst. The load type nanogold catalyst has advantages of good catalytic activity and stability, the chemical materials with cheap price can be used for preparing the load type nanogold catalyst, and the load type nanogold catalyst enables multitime usage.

Description

technical field [0001] The invention relates to a preparation method of a loaded nano-gold catalyst. Background technique [0002] Supported nano-gold catalysts have shown excellent catalytic performance in many important selective oxidation reactions, however, extremely small-sized gold particles with large surface free energy and low melting point will occur in the absence of steric barriers. The rapid self-aggregation makes the size of gold particles increase sharply, thus losing the catalytic activity. Therefore, the physical and chemical properties of the support in supported nano-gold catalysts, such as structural composition, affinity for gold species, and the interaction between gold particles and supports, play a key role in the catalytic activity and stability of the final supported nano-gold catalysts. Sexuality. Compared with traditional supported nano-gold catalyst supports, such as metal oxides or activated carbon, mesoporous materials have a more regular por...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/26
Inventor 彭建兵喻宁亚
Owner SHUNDE POLYTECHNIC
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