Preparation method of catalyst for selective hydrogenation of alkyne and alkadiene

Abstract

The invention relates to a preparation method of a catalyst for the selective hydrogenation of alkyne and alkadiene. A carrier of the catalyst is a compound of 30-99% of aluminum oxide, 1-50% of titanium oxide, 1-30% of magnetism oxide and 1-40% of zinc oxide based on the weight of the carrier of the catalyst as 100%; meanwhile, an alcohol reagent and an alkali metal or an alkaline-earth metal are used as modifying reagents; the preparation method is an acidity sol mixed kneading molding method; the active components of the catalyst comprise three or more of palladium, gold, silver, bismuth, cerium, lanthanum, tin and antimony, and a loaded solution of the active components is subjected to polymerization; the carrier of the catalyst prepared by the method has relatively low acid content; and the prepared catalyst shows up relatively appropriate reaction activity in the selective hydrogenation reaction of the alkyne and the alkadiene and has relatively good hydrogenation selectivity, relatively strong green oil generation resistance and relatively low palladium wastage rate.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for the selective hydrogenation of alkynes and dienes, in particular to a selective hydrogenation catalyst in which a multi-metallic active component is loaded on a composite carrier of aluminum oxide, titanium oxide, magnesium oxide, and zinc oxide Process for the preparation of hydrogenation catalysts. Background technique [0002] In the refining and chemical industry, olefin raw materials produced by co-processes such as steam cracking and catalytic cracking all contain alkynes and dienes, which are poisons for the further processing and utilization of olefins or affect the stability of catalysts used in the further processing and utilization of olefins. Therefore, these impurities must be removed. In industry, selective hydrogenation is usually used to remove alkynes and dienes in olefin raw materials. [0003] EP738540 and EP0064301 disclose a selective hydrogenation catalyst containing...

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Problems solved by technology

The hydrogenation catalyst prepared by the above method generally exists: (1) the hydrogenation selectivity is low, such as the catalyst for carbon four hydrogenation selective alkyne or diene removal, the loss of butadiene or the loss of monoolefin is greater than 1.5%; (2) The stability of the catalyst activity is poor. For example, the operation period of the industrialized cracking carbon tetrahydrogenation and alkyne removal catalyst at home and abroad is within 6 months; (3) The amount of green oil is large, and the catalyst is easy to coke. Due to the relatively large acidity of the carrier , alkynes and diolefins are prone to polymerization reactions, and the generated polymers are attached to the active center of the catalyst to cause coking and deactivation of the catalyst; (4) The palladium loss of the active center is fast, and after a general industrial device runs for a cycle (within 6 months), The loss rate of palladium is greater than 10%

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