عنوان
Mo(VI) Schiff base complex immobilized on graphene oxide nano‑sheets as an efficient, selective and reusable catalyst for epoxidation of olefins
نویسنده (گان)
Rezazadeh,Behnam;Pourali,Alireza;Banaei,Alireza; behniafar,Hossein
چکیده مقاله
Heterogenization of homogeneous catalysts onto solid supports has been studied because of the long catalytic lifetime, easy separation, thermal stability, high selectivity, and easy recyclability [1]. For the heterogenization of homogeneous catalysts, which suffer from drawbacks such as deactivation, difficult recovery and difficult recycling, graphene oxide (GO) is a convenient and efficient supporting material [2].In this work Mo(VI) tetradentate Schiff base complex was covalently immobilized onto chemically functionalized graphene oxide (GO) using 3-aminopropyltriethoxysilane as a coupler. The resulting heterogeneous catalysis has been characterized by FTIR, XRD, SEM, DRS, TGA, and inductively coupled plasma-atomic emission spectroscopy (ICPAES). Catalyst was used for the selective epoxidation of alkenes using tert-butyl hydroperoxide as oxidant. This catalyst is efficient for oxidation of cyclooctene with a moderate 100% selectivity for epoxidation with 98% conversion in 30 min. The recycling experiment results indicated that the catalyst was highly stable and maintained very high activity, and selectivity even after being used for five cycles.

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