@inproceedings{8c1cfa40ee6c4e18b92de1e119a0e2b2,
title = "Hierarchical porous catalyst support: Shaping, mechanical strength and catalytic performances",
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.",
keywords = "Alumina support, Core/shell bimaterial, Indentation, Pd catalyst, Selective hydrogenation",
author = "S. Ould-Chikh and S. Pavan and A. Fecant and E. Trela and C. Verdon and A. Gallard and N. Crozet and Loubet, {J. L.} and M. Hemati and L. Rouleau",
year = "2010",
doi = "10.1016/S0167-2991(10)75024-2",
language = "English (US)",
isbn = "9780444536013",
series = "Studies in Surface Science and Catalysis",
publisher = "Elsevier Inc.",
pages = "193--200",
booktitle = "Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium",
address = "United States",
}