Preparation method of palladium catalyst, catalyst and application

Abstract

The invention provides a preparation method of a palladium catalyst, the catalyst and application. The catalyst is prepared by directly using aromatic compounds containing phosphorus and sulfur substituents, such as triphenylphosphine sulfur, diphenyl phosphorus hydrosulfide and the like, as modifiers to modify Pd or Pd/X with a carrier. The amount of modifiers for preparing the catalyst is low and the preparation method is simple and convenient; the prepared catalyst has efficient and stable catalytic activity and can be used for alkyne semi-hydrogenation reaction, wherein high selectivity isachieved on terminal alkyne compound semi-hydrogenation, and industrial application is facilitated.

Description

[0001] Technical field: the present invention relates to a kind of preparation method of catalyst, particularly a kind of preparation method of palladium catalyst, catalyst and application. Background technique: [0002] Cracking to olefins has a very wide range of uses in the petrochemical industry and occupies a very important position. However, there will be trace amounts of alkynes and dienes while producing corresponding olefins. Although the content of these alkynes and dienes is small, they will affect the polymerization effect of olefins and reduce the quality of the product. Therefore, it is necessary to remove these trace impurities remove. Commonly used methods in industry include solvent absorption, low-temperature rectification, and selective hydrogenation to remove the corresponding alkynes. It is a relatively simple and convenient method to catalytically hydrogenate the corresponding alkynes to form alkenes by catalytic hydrogenation. However, alkenes can be ea...

AI Technical Summary

Problems solved by technology

U.S. Patent No. 128595 discloses a method, adding alkyne-containing gas vapor and an inert hydrocarbon solvent into a reaction vessel to carry out catalytic hydrogenation with a VIII group metal-alumina catalyst such as palladium, nickel, etc., but the alkyne-containing gas Poor solubility in hydrocarbon solvents; patent CN101428228A discloses a selective hydrogenation catalyst, wherein the active component of the catalyst is palladium, auxiliary agent copper, and alumina is used as a carrier, and the catalyst is suitable for rich in alkyne residues Selective hydrogenation to remove alkyne, its carrier treatment and preparation need high temperature above 900°C for treatment

[0004] Due to the high activity of palladium, the site of poisoning part is often needed to have good selectivity to alkynes, which leads to the low utilization rate of palladium, increases the use of precious metals, and increases the cost; on the other hand, The preparation method of selective semi-hydrogenation catalyst, especially the preparation method of selective semi-hydrogenation catalyst for terminal alkynes is relatively complicated, and it is difficult to carry out industrial-scale application production

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