Pd-Ag/Al2O3-TiO2 catalyst for selective hydrogenation of cracked gasoline or its fractions, and preparation method thereof

Abstract

The invention relates to a Pd-Ag / Al2O3-TiO2 catalyst for selective hydrogenation of cracked gasoline or its fractions. The catalyst comprises an Al2O3-TiO2 composite as a carrier, and active components of Pd and Ag loaded on the carrier, wherein the Pd content accounts for 0.15-0.5wt% of the total weight of the catalyst, and the Ag content accounts for 0.8-4.5wt% of the total weight of the catalyst. Compared with same catalysts, the catalyst for the hydrogenation of the cracked gasoline or its fractions of the invention has the advantages of high hydrogenation selectivity at a low temperature, strong As impurity resistance, large charging capacity and stable activity. In addition, the invention also relates to a preparation method of the catalyst. The catalyst of the invention can also be used for the selective hydrogenation of alkynes and / or diolefins of other petroleum hydrocarbons.

Description

technical field [0001] The invention relates to a palladium-silver / alumina-titania catalyst for selective hydrogenation of petroleum hydrocarbons, in particular to a palladium-silver / alumina-titania catalyst for selective hydrogenation of pyrolysis gasoline or its fractions. The invention also relates to a process for preparing said catalyst. Background technique [0002] pyrolysis gasoline C 5 -C 9 Distillate is a by-product of the ethylene industry. According to different cracking raw materials and cracking depths, its output accounts for more than 50% by weight of ethylene production capacity, and the content of aromatics accounts for 40-80% by weight, so it is the main source of aromatics. Cutting C on industrial production 8 and C 9 The distillate undergoes one-stage hydrogenation to remove highly unsaturated hydrocarbons, such as chain conjugated dienes, styrene, alkynes and cyclic conjugated dienes, and then undergoes two-stage hydrodesulfurization to remove monoe...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application publication CN1665588A discloses a palladium-silver hydrogenation catalyst and a preparation method thereof. The carrier material is selected from alumina, silicon dioxide, titania, zirconia, aluminosilicate, zinc titanate and mixtures thereof, and the carrier is preferably Alumina, the catalyst composition has a palladium content of about 0.01-0.6 wt%, a silver content of about 0.02-5 wt%, and an iodine content of about 10-1000ppm, the inventors claim that the catalyst is effective for highly unsaturated hydrocarbon fluids The raw material, especially for acetylene, has good selectivity and conversion rate and low deactivation rate, but its anti-arsenic impurity performance still has room for improvement

However, the stability of the catalyst needs to be improved

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