Hierarchical porous catalyst support: Shaping, mechanical strength and catalytic performances

Samy Ould-Chikh*, S. Pavan, A. Fecant, E. Trela, C. Verdon, A. Gallard, N. Crozet, J. L. Loubet, M. Hemati, L. Rouleau

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    5 Scopus citations

    Abstract

    Palladium layered catalysts were reported to have the best performances for selective hydrogenations. A new core/shell bimaterial consisting of low specific surface area α alumina beads coated by a high specific surface area γ alumina layer is proposed and is suitable for a controlled thickness deposition of metallic palladium particles. A coating process was developed for a pan granulator where γ alumina dry powder was added under a boehmite sol pulverisation onto α-Al2O3 beads. The material exhibits a uniform and non defective coating (20 μm), a strong resistance against general attrition and local mechanical properties of coating and interface measured by nanoindentation in the order of magnitude of conventional γ-Al2O3 beads. Metallic nano-particles deposited by incipient wetness impregnation of palladium nitrate solution are more preferentially located into the γ alumina shell. Activity and selectivity of Pd core/shell bimaterial catalyst are hugely improved compared to traditional catalyst (Pd deposited onto α-Al2O3 beads) in selective hydrogenation of styrene/isoprene model mixture. This metallic core/shell catalysts are thus promising candidates for reactions sensitive to intra-particular diffusion limitations.

    Original languageEnglish (US)
    Title of host publicationScientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium
    PublisherElsevier Inc.
    Pages193-200
    Number of pages8
    ISBN (Print)9780444536013
    DOIs
    StatePublished - Jan 1 2010

    Publication series

    NameStudies in Surface Science and Catalysis
    Volume175
    ISSN (Print)0167-2991

    Keywords

    • Alumina support
    • Core/shell bimaterial
    • Indentation
    • Pd catalyst
    • Selective hydrogenation

    ASJC Scopus subject areas

    • Catalysis
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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