Selective hydrogenation catalyst for pyrolysis gasoline

Abstract

The present invention relates to a selective hydrogenation catalyst of pyrolysis gasoline which mainly solves the technical problem in the prior art that the selective hydrogenation catalyst of pyrolysis gasoline which has a high activity in low temperature, a strong anti-interference ability, a high glue capacity, the good stability and well resistant ability towards free water is difficult to prepare. The present invention solves the problem well by a technical proposal which includes that (a) 0.01 percent to 0.5 percent of active component of palladium or an oxide of the palladium; (b) 0.01 percent to 2.0 percent of at least one element which is selected from IA or II A in an element periodic table or the oxide of the element; (c) 0.01 percent to 20.0 percent of at least one element which is selected from IVA or VA in the element periodic table or the oxide of the element; (d) an alumina carrier, which are accounted by a weight proportion of the alumina carrier, and in which, a specific surface of the alumina carrier is 40 square meters per gram to 160 square meters per gram; a total pore volume is 0.3ml / g to 1.2ml / g; the pore volume that a pore diameter of which is less than 30nm is 5 percent to 60 percent of the total pore volume; the pore volume that the pore diameter of which is between 30nm to 60nm is 20 percent to 75 percent of the total pore volume; the pore volume that the pore diameter of which is more than 60nm is 20 percent to 60 percent of the total pore volume. The present invention can be used for the industrial production of the selective hydrogenation of pyrolysis gasoline.

Description

technical field [0001] The present invention relates to a kind of catalyst that is used for the selective hydrogenation of pyrolysis gasoline, especially about a kind of catalyst that is used for C 5 Hydrocarbons ~ hydrocarbon compounds with a dry point of 204°C, whole fraction pyrolysis gasoline or C 6 ~C 8 Catalyst for hydrogenation of pyrolysis gasoline of middle distillates of hydrocarbon compounds. Background technique [0002] Utilization of pyrolysis gasoline in ethylene plant is one of the main ways to improve the comprehensive economic benefits of the plant. Due to the complex composition and poor thermal stability of pyrolysis gasoline, it is usually used for the extraction of aromatics after the first stage of selective hydrogenation to remove dienes and styrene, and the second stage of hydrodesulfurization. At present, the catalysts for selective hydrogenation of pyrolysis gasoline in industry are mainly Pd-based or Ni-based catalysts, and the middle distillat...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1184289C discloses a catalyst for the selective hydrogenation of pyrolysis gasoline and its preparation method and application, including a titanium oxide-alumina composite as a carrier, and the active component metal palladium loaded on the composite carrier, wherein the metal The content of palladium is based on 0.25 to 0.35% (weight) of the total weight of the catalyst. It is said that the catalyst has high space velocity, good selectivity and stability, but does not mention anti-interference, gel capacity and water resistance

However, its low-temperature activity and selectivity need to be further improved.