• 文献标题:   More than just a support: Graphene as a solid-state ligand for palladium-catalyzed cross-coupling reactions
  • 文献类型:   Article
  • 作  者:   YANG Y, REBER AC, GILLILAND SE, CASTANO CE, GUPTON BF, KHANNA SN
  • 作者关键词:   heterogeneous catalysi, nanocatalysi, crosscoupling reaction, graphene
  • 出版物名称:   JOURNAL OF CATALYSIS
  • ISSN:   0021-9517 EI 1090-2694
  • 通讯作者地址:   Virginia Commonwealth Univ
  • 被引频次:   16
  • DOI:   10.1016/j.jcat.2018.01.027
  • 出版年:   2018

▎ 摘  要

While the primary role of supports in catalysis has been to anchor metal particles to prevent sintering, supports can also activate catalytic processes. We report computational and experimental results that provide a fundamental understanding of how a graphene support may activate both oxidative and reductive reaction steps in the catalytic cycle of Suzuki-Miyaura palladium-catalyzed cross-coupling reactions. Theoretical investigations reveal that the high catalytic activity is linked to the ability of a graphene support to act as both an efficient charge donor and acceptor in oxidation and reduction reaction steps. We compare the activation energy and turn over frequency for a series of supported and homogeneous catalysts and find that exposing palladium-graphene to defect inducing microwave radiation results in dramatically lower activation energies and higher turnover frequencies. These results explain why a defected graphene support may catalyze reaction steps that require both charge donation, and charge acceptance. (C) 2018 Elsevier Inc. All rights reserved.