Selective hydrogenation catalyst of cracked gasoline and preparation method of selective hydrogenation catalyst

Abstract

The invention discloses a selective hydrogenation catalyst of cracked gasoline and a preparation method of the selective hydrogenation catalyst. The catalyst comprises a carrier and an active component which is loaded on the carrier; the active component is obtained by ionizing radiation reduction; the active component comprises a main active component (palladium) and an auxiliary active component; the content of the palladium is 0.01 to 1.0 weight percent of the total weight of the carrier; the auxiliary active component is one or more of stannum (Sn), lead (Pb), copper (Cu), gallium (Ga), zinc (Zn), silver (Ag), antimony (Sb), manganese (Mn), cobalt (Co), molybdenum (Mo) and tungsten (W); and the content of the auxiliary active component is 0 to 3.0 weight percent of the total weight of the carrier. A metal active component precursor or oxide which is obtained by roasting the metal active component precursor is subjected to the ionizing radiation reduction to obtain the selective hydrogenation catalyst of the cracked gasoline, wherein the metal active component is loaded on the carrier of the catalyst. The catalyst prepared by the method improves the utilization rate of the main active component (palladium), so that the hydrogenation activity and selectivity of the catalyst are obviously improved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a pyrolysis gasoline selective hydrogenation catalyst and a preparation method thereof. Background technique [0002] Pyrolysis gasoline is a general term for the liquid by-product C5-C10 fractions produced during the cracking of light oil to produce ethylene and propylene. The composition of pyrolysis gasoline is very complex, mainly including benzene, toluene, xylene, mono-olefins, di-olefins, straight-chain alkanes, cycloalkanes, and organic compounds of nitrogen, sulfur, oxygen, chlorine and heavy metals, etc., a total of more than 200 components, of which Benzene, toluene, xylene (collectively referred to as BTX) are about 50-80% aromatics and 25-30% unsaturated hydrocarbons. In industrial production, it mainly cuts C6-C8 fractions, removes highly unsaturated hydrocarbons, such as chain conjugated dienes, styrene, and cyclic conjugated dienes, through one-stage selecti...

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Problems solved by technology

Although the palladium hydrogenation catalyst prepared by electroless plating does not need to be reduced by hydrogen, it needs multiple sensitization and activation steps. This method not only wastes a large amount of palladium solution, but also is not easy to accurately control the palladium content on the catalyst. Insufficient adhesion of the catalytically active coating, which is reflected in the shedding of palladium metal particles when the catalyst is cleaned after production and during use in the catalytic hydrogenation process, which may lead to the gradual deactivation of the catalyst and the reaction medium is covered with metal particle pollution

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