Synthesis and Characterization of Iron鈥揘itrogen-Doped Graphene/Core鈥揝hell Catalysts: Efficient Oxidative Dehydrogenation of N-Heterocycles

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• 作者：Xinjiang Cui ; Yuehui Li ; Stephan Bachmann ; Michelangelo Scalone ; Annette-Enrica Surkus ; Kathrin Junge ; Christoph Topf ; Matthias Beller
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：137
• 期：33
• 页码：10652-10658
• 全文大小：599K
• ISSN：1520-5126

文摘

An important goal for nanocatalysis is the development of flexible and efficient methods for preparing active and stable core鈥搒hell catalysts. In this respect, we present the synthesis and characterization of iron oxides surrounded by nitrogen-doped-graphene shells immobilized on carbon support (labeled FeO_x@NGr鈥揅). Active catalytic materials are obtained in a simple, scalable and two-step method via pyrolysis of iron acetate and phenanthroline and subsequent selective leaching. The optimized FeO_x@NGr鈥揅 catalyst showed high activity in oxidative dehydrogenations of several N-heterocycles. The utility of this benign methodology is demonstrated by the synthesis of pharmaceutically relevant quinolines. In addition, mechanistic studies prove that the reaction progresses via superoxide radical anions (路O₂^鈥?/sup>).