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Gold-based catalyst, and preparation method and application thereof

A catalyst and gold-based technology, which is applied in the field of gold-based catalysts and their preparation, can solve the problems that the catalytic activity and stability of gold-based catalysts cannot meet the industrial application conditions, and it is difficult to take into account the stability, adsorption and activation functions of gold active centers, etc., to achieve environmental protection. Friendly, easy-to-operate effects

Active Publication Date: 2018-06-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it has been reported that single non-metals such as N, P, and B are used to modify carbon supports, but it is still difficult to take into account the stability of gold active centers and the adsorption and activation functions of acetylene and hydrogen chloride on the surface of carbon supports, resulting in the obtained gold-based catalysts. The catalytic activity and stability still cannot meet the industrial application conditions

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  • Gold-based catalyst, and preparation method and application thereof
  • Gold-based catalyst, and preparation method and application thereof
  • Gold-based catalyst, and preparation method and application thereof

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preparation example Construction

[0026] The invention provides a kind of preparation method of gold-based catalyst, comprises the following steps:

[0027] (1) impregnating the carbon material in an aqueous solution of a modification aid to obtain an impregnated carbon material; wherein, the modification aid in the aqueous solution of a modification aid includes a first modification aid and a second modification aid, The first modification aid includes ammonium sulfate or ammonium thiosulfate, and the second modification aid includes ammonium phosphate, melamine or boric acid;

[0028] (2) drying and roasting the impregnated carbon material obtained in the step (1) sequentially to obtain a modified carbon carrier;

[0029] (3) Immersing the modified carbon support obtained in the step (2) in a gold salt solution by an equal-volume impregnation method, and drying to obtain a gold-based catalyst.

[0030] In the present invention, the carbon material is impregnated in an aqueous modification aid solution to ob...

Embodiment 1

[0043] (1) Mix 20-60 mesh coconut shell-based activated carbon with nitric acid solution (25wt.%), carry out acid treatment at 80°C for 10h, filter with suction, and dry the resulting solid material at 100°C for 10h to obtain acid-treated carbon materials;

[0044] (2) At room temperature, immerse the carbon material after 2g acid treatment in the mixture aqueous solution of ammonium phosphate and ammonium thiosulfate (in terms of the mass of phosphorus, the content of ammonium phosphate is 5wt.% of the carbon material; in terms of mass of sulfur Calculated, the content of ammonium thiosulfate is 5wt.% of carbon material) in 8h, obtain impregnated carbon material;

[0045] (3) drying the impregnated carbon material at 100°C for 10h, and then calcining at 400°C for 6h in an argon atmosphere to obtain a modified carbon support;

[0046] (4) At room temperature, the modified carbon support was impregnated in 0.01 g / mL HAuCl by equal volume impregnation method. 4 Aqueous solutio...

Embodiment 2

[0048] The gold-based catalyst is prepared according to the method of Example 1, wherein the aqueous modification aid is a mixture aqueous solution of melamine and ammonium thiosulfate (in terms of the mass of nitrogen, the content of melamine is 5wt.% of the carbon material; in terms of the mass of sulfur Calculated, the content of ammonium thiosulfate is 5wt.% of the carbon material).

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Abstract

The invention provides a preparation method for a gold-based catalyst. In the preparation method, a first modification aid is used to modify a carbon material, so that the gold active component preferentially interacts with a sulfonate radical and can stably exist in a form of small clusters, growth of the gold active component particles is effectively inhibited, and thus the high stability of thegold-based catalyst is guaranteed. At the same time, a second modification aid is used to modify the carbon material, so that effects of adsorbing and activating acetylene and dissociating hydrogen chloride are exerted on the surface of the gold-based catalyst. The catalytic energy efficiency is effectively improved when the gold-based catalyst prepared by the method provided by the invention isapplied to synthesis of vinyl chloride through hydrochlorination of acetylene.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a gold-based catalyst and its preparation method and application. Background technique [0002] Polyvinyl chloride (PVC) is one of the five most important engineering materials in the world. Under the premise of my country's energy structure of "poor oil, little gas and rich coal", acetylene hydrochlorination to vinyl chloride monomer is one of the most important chemical processes. The market share of the coal-chemical route to produce vinyl chloride from acetylene has reached over 75%, occupying an absolute dominant position. At present, activated carbon is widely used to support HgCl in the process of industrial production of vinyl chloride monomer. 2 Catalyst (HgCl 2 / C), yet mercury catalysts have obvious disadvantages: in industrial applications, the high reaction temperature of acetylene hydrochlorination causes mercury volatilization and loss, which ultimat...

Claims

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Application Information

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IPC IPC(8): B01J27/20B01J37/02B01J37/08C07C17/08C07C21/06
CPCC07C17/08B01J27/20B01J37/0207B01J37/082B01J35/391B01J35/394B01J35/393C07C21/06
Inventor 段新平尹燕袁友珠赵郁鑫叶林敏
Owner XIAMEN UNIV