Heterogenization of three homogeneous catalysts: A comparative study as epoxidation catalyst

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• 作者：Jaydeep Adhikary ; Averi Guha ; Tanmay Chattopadhyay ; Debasis Das
• 关键词：Homogeneous catalysts ; Heterogenization ; Modified MCM-41 ; Alkene epoxidation
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：406
• 期：Complete
• 页码：1-9
• 全文大小：732 K

文摘

Three homogeneous catalysts, MnL¹Cl¡¤2H₂O(1.2 H₂O) (HmC-1), FeL¹(NO₃)¡¤3H₂O (HmC-2) and CoL¹(NO₃)¡¤2H₂O (HmC-3) [L¹ = N,N¡ä-ethylenebis(3-formyl-5-methylsalicylaldimine)] have been synthesized and characterized. The catalytic activity of HmC-1, -2 and -3 for epoxidation of alkenes has been investigated in the presence of terminal oxidant tert-butyl hydrogen peroxide (TBHP), in two solvents CH₃CN and CH₂Cl₂. Epoxidation of alkenes catalyzed by HmC-2 and HmC-3 in two solvents CH₃CN and CH₂Cl₂, have also been investigated with of iodosylbenzene (PhIO) as terminal oxidant. The epoxidation study with HmC-1 as catalyst was reported earlier using PhIO as oxidant. Highly ordered 2D-hexagonal mesoporous silica has been functionalized with 3-aminopropyltriethoxysilane (3-APTES) and this has been used to heterogenize the three synthesized homogeneous catalysts and thereby obtained three new heterogeneous catalysts HtC-1, HtC-2 and HtC-3. The heterogeneous catalysts have been characterized by FT-IR, solid state UV-Vis spectroscopy, powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The catalytic activity of these heterogeneous catalysts [HtC-(1-3)] for epoxidation of alkenes has been investigated in the presence of two terminal oxidants PhIO and TBHP, in two solvents CH₃CN and CH₂Cl₂ under mild conditions and compared their activity with their homogeneous counterpart.