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...

Examples

Embodiment 1

[0029] First, the prepared graphene was washed with 10% nitric acid for 3 hours, then washed with water until neutral, then soaked in 2% dilute ammonia water for 1 hour, and dried at 120° C. for 5 hours to obtain the graphene carrier.

[0030] The preparation of Pd / graphene (0.5% by weight): the palladium chloride of metering is dissolved in pure water, hydrochloric acid is added dropwise to all dissolving and the pH value of solution is adjusted to 3 while heating, and above-mentioned treated graphite Graphene is impregnated in the prepared palladium chloride solution by metering, and after soaking for 12 hours, it is dried at 120° C. to prepare a supported graphene catalyst precursor.

[0031] Prepare the supported graphene catalyst precursor of Pd / graphene (0.3% by weight), Pd / graphene (0.2% by weight) in the same way.

Embodiment 2

[0033] Three kinds of catalyst precursors prepared by Example 1 were reduced by electroless plating to obtain Pd / graphene catalysts with different active metal contents. The specific method is:

[0034] Put the Pd / graphene catalyst precursor into a three-necked flask with an ice-water bath, and after passing through nitrogen, add metered KBH dropwise 4 -KOH mixed solution reduction, until there is no gas release in the system, the black solid Pd-B / graphene catalyst obtained. After repeated washing with distilled water, they were stored in absolute ethanol for later use.

Embodiment 3

[0036] The three catalyst precursors prepared in Example 1 were subjected to hydrogen reduction to obtain Pd / graphene catalysts with different active metal contents. The specific method is:

[0037] The Pd / graphene catalyst precursor is directly put into a tubular reactor, and the Pd / graphene catalyst is obtained by passing hydrogen gas at 120° C. for 3 to 5 hours for reduction.

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...

Examples

Embodiment 1

[0029] First, the prepared graphene was washed with 10% nitric acid for 3 hours, then washed with water until neutral, then soaked in 2% dilute ammonia water for 1 hour, and dried at 120° C. for 5 hours to obtain the graphene carrier.

[0030] The preparation of Pd / graphene (0.5% by weight): the palladium chloride of metering is dissolved in pure water, hydrochloric acid is added dropwise to all dissolving and the pH value of solution is adjusted to 3 while heating, and above-mentioned treated graphite Graphene is impregnated in the prepared palladium chloride solution by metering, and after soaking for 12 hours, it is dried at 120° C. to prepare a supported graphene catalyst precursor.

[0031] Prepare the supported graphene catalyst precursor of Pd / graphene (0.3% by weight), Pd / graphene (0.2% by weight) in the same way.

Embodiment 2

[0033] Three kinds of catalyst precursors prepared by Example 1 were reduced by electroless plating to obtain Pd / graphene catalysts with different active metal contents. The specific method is:

[0034] Put the Pd / graphene catalyst precursor into a three-necked flask with an ice-water bath, and after passing through nitrogen, add metered KBH dropwise 4 -KOH mixed solution reduction, until there is no gas release in the system, the black solid Pd-B / graphene catalyst obtained. After repeated washing with distilled water, they were stored in absolute ethanol for later use.

Embodiment 3

[0036] The three catalyst precursors prepared in Example 1 were subjected to hydrogen reduction to obtain Pd / graphene catalysts with different active metal contents. The specific method is:

[0037] The Pd / graphene catalyst precursor is directly put into a tubular reactor, and the Pd / graphene catalyst is obtained by passing hydrogen gas at 120° C. for 3 to 5 hours for reduction.

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