Method for highly selectively catalyzing epoxidation between olefin and air by cobalt-loaded zeolite molecular sieve

Abstract

The invention relates to a chemical reaction process for preparing an epoxide by multi-phase catalytic oxidation, in particular to a method for highly selectively catalyzing epoxidation between olefin and air by a cobalt-loaded zeolite molecular sieve. Cobalt which is a non-precious transition metal and has a catalytic activity is exchanged to zeolite molecular sieve frameworks of different apertures and structures according to a certain loading proportion by an ion exchange method to prepare a cobalt-loaded zeolite molecular sieve based catalyst; and such olefine compounds as styrene class, Alpha, Beta-pinene class, cycloolefin class, Beta-cinnamyl chloride class and linear olefin class are catalyzed to perform epoxidation reaction in a solvent at a certain reaction temperature for a certain reaction time by taking air at a certain flowing rate as an oxidant (a small amount of t-butylhydroperoxide (TBHP) as initiators) without adding any reducing agent. The method has the advantages that the catalyst is simple in preparation, the raw material is high in conversion rate, the target product is high in selectivity, the reaction is short in time, high in efficiency and mild in condition, the operation is easy to control, the cost is low and the whole environment is environment-friendly.

Description

technical field [0001] The invention relates to a chemical reaction process for preparing epoxides through heterogeneous catalytic oxidation, in particular to a cobalt-supported zeolite molecular sieve high-selectivity catalytic olefin and air epoxidation method. Background technique [0002] Olefin epoxidation products are a class of organic raw materials and intermediates with a wide range of uses, and are widely used in petrochemical, fine chemical and organic synthesis fields. [0003] Highly selective oxidation of hydrocarbons is one of the most important tasks of the 21st century [(a) C.L Hill, Nature 1999, 401, 436; (b) D.E.de Vos; B.F.Sels; P.A. Jacobs, Adv.Catal.2001 , 46, 1], the catalytic epoxidation of olefin compounds under mild conditions has always been the focus of research in the field of fine chemicals. At present, the synthesis of epoxy compounds mainly adopts the selective catalytic oxidation of olefins, including homogeneous catalytic systems and hetero...

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Problems solved by technology

For example, ion-exchanged Co 2+ -X molecular sieves showed good catalytic ability in the epoxidation reaction of styrene and pure oxygen (prepared from air separation), but the epoxidation selectivity was not high [(a) Q.H.Tang, Q.H.Zhang, H.L. Wu, Y.Wang, J.Catal.2005, 230, 384; (b) Zhang Qinghong, Tang Qinghu, Liang Jun, Wang Ye, Chinese patent CN1557554A; (c) R.V.Jasra, J.Sebastian, US patent US20070149791A1]

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