A kind of acetylene hydrochlorination reaction with low noble metal content au‑cu‑tio 2 The preparation method of /c catalyst

Abstract

The invention discloses a preparation method of low-precious metal Au-Cu-TiO2 / C catalyst for an acetylene hydrochlorination reaction. The catalyst is used in the acetylene hydrochlorination reaction. The catalyst is prepared through an ultrasonic assisted impregnation process. The method comprises the following steps: adding pretreated particulate active carbon to an auric chloride acid, copper chloride and titanium dioxide mixed solution adopting anhydrous ethanol as a solvent, carrying out ultrasonic treatment for 30min, carrying out magnetic stirring at normal temperature for 3h to make active components be uniformly loaded on the above active carbon carrier, standing for 5h, heating in 70DEG C water bath until the above impregnation solution is completely evaporated, and drying the evaporated catalyst in a 100DEG C oven for 12h to obtain the Au-Cu-TiO2 / C catalyst sample. Auric chloride acid, copper chloride and titanium dioxide are used according to a mass ratio of Au to Cu to TiO2 of 0-0.55:4:5-11, and most preferably 0.45:4:9. The preparation method of the catalyst has the advantages of simplicity, reduction of the content of precious metals, no pollution, and good catalysis activity and vinyl chloride selectivity in the acetylene hydrochlorination reaction.

Description

technical field [0001] The invention relates to a low noble metal content Au-Cu-TiO 2 The preparation method of / C catalyst, especially refers to a kind of low precious metal content Au-Cu-TiO that is used for mercury-free catalytic acetylene hydrochlorination reaction 2 The preparation method of / C catalyst. Background technique [0002] With the increasing development of the national economy and the continuous improvement of people's living standards, the demand for polyvinyl chloride is increasing. Compared with the production of vinyl chloride by the ethylene method and the ethane method, the production of vinyl chloride by the acetylene method has the advantage of "one step", that is, only one reaction is involved and no by-products are generated. However, the ethylene method and the ethane method involve many side reactions, which reduce the yield of vinyl chloride and the separation of the target product vinyl chloride is also very complicated. However, the acetyle...

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Problems solved by technology

However, during the reaction of gold catalysts, Au 3+ Easily reduced to Au 0 inactive

In order to improve the stability of gold catalysts, some researchers tried to prevent the Au 3+ reduction, however, the results showed that the addition of the second metal chloride did not significantly increase the Au 3+ stability

On this basis, we investigate the simultaneous promotion of metal chlorides and metal oxides on Au catalysts, CuCl 2 and TiO 2 Double-doped Au-Cu-TiO 2 There are relatively few studies on the application of / C catalysts in the hydrochlorination of acetylene

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