Covalent Immobilization of Imidazolium Cations Inside a Silica Support: Palladium-Catalyzed Olefin Hydrogenation

Authors

  • Dr. Lei Wang,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
    2. Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun, 130012 (China)
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  • Dr. Sankaranarayanapillai Shylesh,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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  • Daniel Dehe,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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  • Thomas Philippi,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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  • Gunder Dörr,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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  • Dr. Andreas Seifert,

    1. Institut für Chemie, Technische Universität Chemnitz, Straße der Nationen 62, 09111 Chemnitz (Germany)
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  • Dr. Zhou Zhou,

    1. Erlangen Catalysis Resource Center (ECRC), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)
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  • Prof. Dr. Martin Hartmann,

    1. Erlangen Catalysis Resource Center (ECRC), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen (Germany)
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  • Prof. Dr. Robin N. Klupp Taylor,

    1. Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen (Germany)
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  • Prof. Dr. Mingjun Jia,

    1. Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun, 130012 (China)
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  • Prof. Dr. Stefan Ernst,

    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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  • Prof. Dr. Werner R. Thiel

    Corresponding author
    1. Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
    • Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. Geb. 54, 67661 Kaiserslautern (Germany), Fax: (+49) 631-2054676
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Abstract

Mesoporous organosilica materials with different contents of bistrialkoxysilyl imidazolium salts in the framework were synthesized by a one-step synthesis. Textural characterization of the materials confirmed that the morphology and surface properties of the imidazolium-bridged organosilicas depended critically on the amount of organic groups in the framework, whereas solid-state NMR characterization showed that the imidazolium fragments were integrated covalently into the framework. Further reaction of these materials with Pd(OAc)2, followed by reduction with NaBH4 yielded palladium nanoparticles stabilized in the mesoporous organosilicas. The stabilizing effect of the imidazolium cations and the mesostructure contributed to the high activity, selectivity, and stability of the palladium nanoparticles and allowed olefin hydrogenation under mild reaction conditions.

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