Method for preparing catalyst applied to preparation of ethylene by hydrogenation of acetylene through super-gravity process and application of catalyst

Abstract

The present application discloses a method for preparing a catalyst for hydrogenation of acetylene to ethylene by a high gravity method, which comprises the following steps: dissolving nickel nitrate and zinc nitrate in deionized water, adding hexamethylenetetramine and PVP for ultrasonic treatment Obtain the first solution, then add mesoporous molecular sieve SBA-16 into NMP and mix with the first solution to obtain a mixed solution, then move to a high-gravity rotating packed bed for co-immersion, and centrifuge the mixed solution to obtain a solid substance After drying, it was calcined under a nitrogen atmosphere and naturally lowered to room temperature and then subjected to reduction treatment in a weakly alkaline liquid phase environment to obtain a Ni-Zn / SBA-16 catalyst. The present application also provides an application method of the catalyst prepared by the above method. The catalyst prepared by the above method has a significantly longer cycle life than the catalyst prepared by the traditional method in industrial applications, and can be directly used for the reaction after being reduced by sodium borohydride before use, without the need for high-temperature hydrogen reduction, which is more beneficial to simplify gas-liquid ‑Process flow of solid three-phase catalytic system.

Description

technical field [0001] The application relates to the technical field of hydrogenation of acetylene to ethylene, in particular to a method and application of a catalyst for hydrogenation of acetylene to ethylene prepared by a high-gravity method. 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 carbide process has been wi...

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Problems solved by technology

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

However, the above problems have not been reported in the related research of catalysts.

At the same time, the traditional catalytic hydrogenation uses noble metal Pd as the main catalyst, and Ag, Au and other additives need to be added in addition, and the catalyst cost is relatively high. However, although the performance of Ni in selective catalytic hydrogenation is reduced, its preparation cost is relatively low. and still receive attention

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