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 activi

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
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Example Embodiment

[0023] Example one

[0024] The preparation method of the supported nano-gold catalyst includes the following steps:

[0025] step one

[0026] At 60 o Under C condition, weigh 19% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form turbid solution A;

[0027] Step two

[0028] After preparing 15% formaldehyde into an aqueous formaldehyde solution with a concentration of 37 wt.%, it was mixed with deionized water to obtain a turbid solution B, and then the pH value of solution B was adjusted to 8.7 with an aqueous sodium hydroxide solution, and then 11% Melamine and 7% thiourea, at 60 o Stir at C 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, and under v...

Example Embodiment

[0033] Example two

[0034] The preparation method of the supported nano-gold catalyst is characterized in that it comprises the following steps:

[0035] step one

[0036] At 70 o Under C condition, weigh 23% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form turbid solution A;

[0037] Step two

[0038] After preparing 17% formaldehyde into an aqueous formaldehyde solution with a concentration of 37 wt.%, it was mixed with deionized water to obtain a turbid solution B, and then the pH value of solution B was adjusted to 8.5-9.0 with sodium hydroxide aqueous solution, and then 9 was added % Melamine and 6% thiourea, at 50 o Stir at C 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 po...

Example Embodiment

[0043] Example three

[0044] The preparation method of the supported nano-gold catalyst is characterized in that it comprises the following steps:

[0045] step one

[0046] At 50 o Under C condition, weigh 15% polyoxypropylene polyoxyethylene copolymer solution and dissolve it in deionized water to form turbid solution A;

[0047] Step two

[0048] After preparing 13% formaldehyde into an aqueous formaldehyde solution with a concentration of 37 wt.%, it was mixed with deionized water to obtain a turbid solution B. Then, the pH value of solution B was adjusted to 8.5-9.0 with aqueous sodium hydroxide, and then 13 was added. % Melamine and 8% thiourea, at 70 o Stir at C 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% gla...

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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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