Selective hydrogenation catalyst and its preparation method and application

Abstract

The invention relates to a selective hydrogenation catalyst and its preparation method and application. The catalyst comprises a catalyst carrier and metal active ingredients, prepared by the following steps: pickling graphene and then washing the pickled graphene with water to neutral, then immersing the neutral graphene in weak ammonia and drying at a high temperature to obtain the catalyst carrier, preparing active metal into a precursor solution of the active metal, then steeping or spraying the precursor solution on the catalyst carrier to obtain a supported graphene catalyst precursor precursor, drying and then reducing to obtain a product. The catalyst can be used in selective hydrogenation catalytic reaction. Compared with the prior art, the catalyst can be used for a one-stage selective hydrogenation reaction of cracked gasoline and can be simultaneously used for a selective hydrogenation reaction of C2-C4. The catalyst has the advantages of high hydrogenation activity and good diolefin hydrogenation selectivity, and is beneficial for prolonging the regeneration period of the catalyst.

Description

technical field [0001] The invention relates to a catalyst for petroleum hydrocarbon products, a selective hydrogenation catalyst and its preparation method and application, in particular to a selective hydrogenation catalyst and its preparation method and application. Background technique [0002] Pyrolysis gasoline is a by-product of the ethylene production process C 5 ~220°C distillate in general, which comes from the condensate between the rapid water cooling tower, the debutanizer tower and the compressor section of the ethylene cracking unit. The composition of pyrolysis gasoline is quite complex, in which the content of aromatics is as high as 70%, and the performance of unsaturated components in oil products is extremely unstable. use. At present, the two-stage hydrogenation method is commonly used in the industrial processing of pyrolysis gasoline. The one-stage hydrogenation reaction is relatively mild, mainly to remove highly reactive diolefins. The reaction c...

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Problems solved by technology

They are all composed of palladium metal supported on alumina in different crystal phases, and the hydrogenation activity of diene is improved, but the selectivity is not significantly improved.

[0007] Diolefins in pyrolysis gasoline are easy to polymerize or dehydrogenate at high temperature. Therefore, the hydrogenation activity of the first-stage hydrogenation catalyst should not be too high, and it should have a high hydrogenation selectivity of diolefins to reduce the reaction temperature caused by the hydrogenation of monoolefins. If the temperature rises too high, the deposition of carbon and coke on the catalyst will be accelerated. At the same time, the catalyst should have a large gel-holding capacity to prolong the regeneration period of the catalyst. solved problem

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