Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 559355
Title Silica-Supported Au–Ag Catalysts for the Selective Hydrogenation of Butadiene
Author(s) Masoud, Nazila; Delannoy, Laurent; Calers, Christophe; Gallet, Jean Jacques; Bournel, Fabrice; Jong, Krijn P. de; Louis, Catherine; Jongh, Petra E. de
Source ChemCatChem 9 (2017)12. - ISSN 1867-3880 - p. 2418 - 2425.
DOI https://doi.org/10.1002/cctc.201700127
Publication type Refereed Article in a scientific journal
Publication year 2017
Keyword(s) atomic rearrangements - Au–Ag - heterogeneous catalysis - hydrogenation - photoelectron spectroscopy
Abstract

Gold and silver are miscible over the entire composition range, and form an attractive combination for fundamental studies on bimetallic catalysts. Au–Ag catalysts have shown synergistic effects for different oxidation and liquid-phase hydrogenation reactions, but have rarely been studied for gas-phase hydrogenation. In this study 3 nm particles of Au, Ag and Au–Ag supported on silica (SBA-15) were investigated as catalysts for selective hydrogenation of butadiene in an excess of propene. The Au catalyst was over an order of magnitude more active than the Ag catalyst at 120 °C. The initial activity of the Au–Ag catalysts scaled linearly with the Au-content, suggesting a direct correlation between the surface and overall compositions of the nanoparticles and the absence of synergistic effects. All Au-containing catalysts were highly selective to butenes (>99.9 %). The Au catalysts were stable, whereas the Au–Ag catalysts lost about half of their activity during 20 h run time at 200 °C, but the initial activity was restored by a consecutive oxidation-reduction treatment. Near ambient pressure x-ray photoelectron spectroscopy showed that exposure to H2 at elevated temperatures led to a gradual enrichment of the surface of the Au–Ag nanoparticles by Ag. These observations highlight the importance of considering progressive atomic rearrangements in bimetallic nanocatalysts under reaction conditions.

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