MoO2 (acac)2 supported on graphene oxide as a highly efficient and reusable catalyst for epoxidation of styrene

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 238

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شناسه ملی سند علمی:

IICC21_275

تاریخ نمایه سازی: 5 آذر 1398

چکیده مقاله:

Epoxidation of alkenes catalyzed by metal complexes is an important reaction in organic synthesis because these compounds serve as useful intermediates that can be used for synthesis of a wide variety of other compounds [1]. Transition metals such as manganese and molybdenum have been used for alkene epoxidation [2]. Recently, metal acetylacetone complexes have been grafted onto supports as heterogeneous catalysts for the oxidation of olefinns or other substance [3]. Graphene oxide (GO), due to the presence of plenty of oxygen functionalities, such as hydroxyl and epoxide groups on both sides of its surface, has been acknowledged as one of the most promising supports to immobilize various homogeneous materials, including transition metal complexes [4]. Different approaches have been used to immobilize molybdenum on various supports to obtain heterogeneous catalysts [5]. This paper describes a catalytic system bases on graphene oxide modified with imidazole which was used as supports for MoO2 (acac)2. The heterogeneous catalyst, was characterized by FT-IR, UV-Vis and SEM. Characterization results showed that dioxomolybdenum (VI) complex was successfully grafted onto graphene oxide and the structure of the graphene oxide was well preserved after several stepwise synthesis procedures. The catalytic activity and reusability of catalyst in the styrene epoxidation was investigated. In addition, the heterogeneous catalyst could be reused five times without significant loss of activity.

نویسندگان

Ali Zarnegaryan

Department of Chemistry, Yasouj University, Yasouj ,Iran

Soghra Hosseinimotlagh

Department of Chemistry, Yasouj University, Yasouj ,Iran