Synthesizing method and application for bi-component bi-metallic catalyst

Abstract

The invention belongs to the field of green organic synthesis and aims to provide a synthesizing method and application for a bi-component bi-metallic catalyst. The method comprises the following steps that: dissolving multi-cyanogroup alloy potassium peroxymonopersulfate in deionized water, and then adding a water soluble polymer; stirring till completely dissolving the water soluble polymer, and then dripping into the aqueous solution of halide salt, nitrate, phosphate or sulfate of zinc, cobalt or cadmium; after stirring or performing ultrasonic reaction, separating and drying so as to obtain solid; mixing the obtained solid with quaternary ammonium salt, phosphor salt or mixture thereof in any proportion; and performing wet ball milling on the obtained mixture, and then separating, drying and sieving, thereby obtaining the bi-component bi-metallic catalyst. The bi-component bi-metallic catalyst is high in catalyzing efficiency and selectivity; the overall indicator of the catalyzing efficiency and selectivity is better than that of the prior art; the bi-component bi-metallic catalyst has the obvious advantage that less water almost has no influence on the activity and selectivity of the catalyst; and the catalyst provided by the invention is capable of catalyzing the coupling reaction of bi-radical or multi-radical oxide and CO2 and has excellent activity and selectivity.

Description

technical field [0001] The invention belongs to the field of green organic synthesis, and in particular relates to a two-component bimetallic catalyst and its application in the process of efficiently synthesizing cyclic carbonates by catalyzing epoxides and carbon dioxide. Background technique [0002] carbon dioxide (CO 2 ) is a major greenhouse gas, but also a very important carbon resource. Because it is inexhaustible, the price of pure products is low, and it is non-toxic and harmless, CO 2 Chemical fixation as useful chemical raw materials or organic materials has attracted intense attention and is also an effective way to utilize CO 2 the key way. Among them, by CO 2 Coupling reaction with epoxides to prepare five-membered cyclic carbonates is an important research direction. such as propylene oxide and CO 2 The coupling reaction product propylene carbonate is an aprotic organic solvent with low toxicity and high boiling point and can be used as a "green" solven...

AI Technical Summary

Problems solved by technology

But generally speaking, there are following four disadvantages in above-mentioned catalyzer: 1) catalytic activity is low, and TON (the mole number of the epoxide that is per mole central active metal conversion) is generally less than 2000; More sensitive, showing that when water is contained in the reaction system, the activity and selectivity of the catalyst become significantly worse; such as by ZnX 2 (X=Cl, Br, OAc) and quaternary ammonium salts or phosphonium salts are used to catalyze epoxides and CO 2 Coupling to form cyclic carbonates with very high catalytic efficiency and selectivity at relatively low cost

This is because the removal of water from polar epoxides is a rather energy-intensive and difficult process

[0004] Double metal cyanide complex is a heterogeneous catalyst, which can effectively catalyze the reaction of propylene oxide and CO 2 Copolymerized into polycarbonate materials, the catalytic efficiency can generally reach more than 1500g polymer / g catalyst, and its activity is much higher than other types of CO 2 Copolymerization catalyst, but in the process of copolymerization, often accompanied by a small amount of cyclocarbonate by-products