Synthesis and Characterization of Iron-Nitrogen-Doped Graphene/Core-Shell Catalysts: Efficient Oxidative Dehydrogenation of N-Heterocycles

Xinjiang Cui, Yuehui Li, Stephan Bachmann, Michelangelo Scalone, Annette Enrica Surkus, Kathrin Junge, Christoph Topf, Matthias Beller

Research output: Contribution to journalArticlepeer-review

259 Scopus citations

Abstract

An important goal for nanocatalysis is the development of flexible and efficient methods for preparing active and stable core-shell 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-C). 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-C 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 (·O 2 - ).

Original languageEnglish
Pages (from-to)10652-10658
Number of pages7
JournalJournal of the American Chemical Society
Volume137
Issue number33
DOIs
StatePublished - 31 Jul 2015
Externally publishedYes

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