Catalyst for preparing epoxypropane with propylene gas-phase epoxidation and preparation method thereof

Abstract

The invention discloses a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof, and relates to a catalyst for production of propylene and a preparation method thereof. The invention provides a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof. The catalyst is composed of mAu / Ti-HMS, wherein m represents the mass percentage of Au in the catalyst. According to mass percentage, titanium-silicon solid oxide accounts for 96.0 to 99.7 percent of the catalyst and the Au accounts for 0.3 to 0.4 percent of the catalyst. The molar ratio of silicon to titanium in the titanium-silicon solid oxide is between 5 and 80. A mixed solution of tetra-n-butyl titanate or tetra-iso-propyl-titanate and tetraethyoxysilane is prepared to form a Ti-HMS carrier in the presence of a structure-directing agent of organic primary amine by a sol-gel method, a chloroauric acid compound is loaded on the carrier though impregnation by a deposition precipitation method to obtain a Ti-HMS carried gold catalyst. The catalyst obtained has high catalytic and hydrogen efficiency under a mild reaction condition without the presence of any dressing agent and assistant and is renewable.

Description

technical field [0001] The invention relates to a catalyst for producing propylene oxide and a preparation method thereof, in particular to a catalyst for producing propylene oxide by gas-phase epoxidation of propylene and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material and the third largest organic chemical product in the production of propylene derivatives after polypropylene and acrylonitrile. At present, the industrial production methods of PO mainly include the chlorohydrin method and the co-oxidation method (Halcon method). These two methods account for more than 99% of the world's total production capacity, of which the co-oxidation method accounts for about 60%. The traditional chlorohydrin method has a short process, mature technology, large operating load flexibility, low requirements on the purity of raw material propylene, and low construction investment. The disadvantage is that it ...

AI Technical Summary

Problems solved by technology

The invention patent application with the publication number CN 1260787A discloses a method for epoxidation of propylene with a chloride-containing silver catalyst using oxygen as an oxidant. The catalyst requires a reaction temperature of 250°C and the selectivity of PO is lower than 60%.

Although people have made a lot of efforts to modify and optimize the Ag catalyst system, there is still a big gap from industrialization, especially the PO selectivity of the system needs to be further improved.

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