Preparation and application methods for non-noble metal catalyst used for liquid-phase reaction system used in acetylene hydrogenation

Abstract

The invention discloses preparation and application methods for a non-noble metal catalyst used for a liquid-phase reaction system used in acetylene hydrogenation. According to the invention, a liquid-phase substance in a gas-liquid-solid reaction system is used as a solvent for catalyst synthesis, a metal nitrate is used as a metal ion source, a solvent-thermal synthesis method is employed, and a series of synthesis conditions are regulated so as to eventually prepare the ideal catalyst; meanwhile, before introduction of acetylene gas into the catalyst, the catalyst is subjected to low-temperature reduction in an alkaline liquid-phase environment under the action of reducing agents like sodium borohydride. In evaluation and application of the catalyst, reaction gas comes from carbide acetylene gas and is accompanied by impurity gases like H2S, AsH3 and PH3. The catalyst prepared in the invention has a cheap price, high catalytic activity, good selectivity, strong anti-poisoning capability and solvothermal resistance and is of great significance to industrial promotion of preparation of ethylene via a carbide acetylene method.

Description

technical field [0001] The invention relates to the technical field of ethylene preparation in coal chemical industry, in particular to a preparation and application method of a non-noble metal catalyst used in an acetylene hydrogenation liquid phase reaction system. Background technique [0002] In the field of petrochemical industry, the process of preparing ethylene from petroleum cracking usually contains a small amount of acetylene. In order to prevent acetylene from poisoning the ethylene polymerization catalyst, it is necessary to remove acetylene in the industry, and the catalytic selective hydrogenation of acetylene is the most effective one. method is also a research hotspot in recent years. The reaction system of the catalyst is also aimed at reducing the process conditions of hydrogenation of acetylene to ethylene in an ethylene-rich environment. In the coal chemical technology, the production of acetylene by using coal as raw material through the calcium carbid...

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Problems solved by technology

None of the previous studies involved the solvothermal stability of the catalyst dispersed in the liquid solvent, but in the new reaction system, the solvothermal stability of the catalyst has a great impact on the life of the catalyst as well as the catalytic activity and selectivity, so it must be highly valued , unfortunately no related reports have been seen

At the same time, acetylene produced by calcium carbide method and purified may still contain H 2 S, AsH 3 、PH 3 Such impurity gases can easily lead to catalyst poisoning. The anti-poisoning ability of the catalyst in the liquid phase also needs to be investigated, and the regeneration of the catalyst is difficult.

At the same time, the traditional catalytic hydrogenation uses the noble metal Pd as the main active component, and Ag, Au and other additives need to be added, and the cost of the catalyst is relatively high. However, although the research on the performance of Ni in selective catalytic hydrogenation has decreased, due to its preparation Still gaining traction at a lower cost

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