title: The influence of carbon surface chemistry on supported palladium nanoparticles in heterogeneous reactions.
abstract: The surface chemistry of nanocarbon support can tailor chemical properties of precious metal nanoparticle/nanocarbon hybrid catalyst in heterogeneous reactions. We report on modified reduced graphene oxide (rGO) support with ionic liquid-derived carbonaceous surface for palladium nanoparticle (Pd NPs) decoration and their actions in different heterogeneous reactions. The surface chemistry of support materials was characterized in detail, and the influence of which on the formation and distribution of metal particles was further investigated. Three different types of reactions including Suzuki-Miyaura coupling reaction, CO oxidation and phenol reduction were examined in terms of reactivity and selectivity. The roles of substituted nitrogen in graphitic lattice and grafted groups on the carbon surface were exploited. Nitrogen-doping can give rise to changes in electronic properties of supported metals, and the Lewis basicity of the doped nitrogen atoms can favor the adsorption of acidic reactants in phenol reduction. The grafted groups derived a negative impact to the Suzuki-Miyaura coupling reaction, due to the involvement of larger reactant molecules, despite that they could prevent significant sintering of Pd NPs in the CO oxidation.
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China; Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 101365, Germany.
authors.forename: Yuxiao
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
authors.forename: Liyun
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
authors.forename: Kuang-Hsu
authors.initials: KH
authors.lastname: Wu
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
authors.forename: Zhenbao
authors.initials: Z
authors.lastname: Feng
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Shi
authors.affiliation: Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 101365, Germany.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China.
authors.forename: Bingsen
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China. Electronic address: dssu@imr.ac.cn.
authors.forename: Dang Sheng
authors.initials: DS
authors.lastname: Su
keywords: Heterogeneous catalysis; Ionic liquid; Pd nanoparticles; Reduced graphene oxide; Surface chemistry