Characteristics and Catalytic Properties of Mesocellular Foam Silica Supported Pd Nanoparticles in the Liquid-Phase Selective Hydrogenation of Phenylacetylene |
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Authors: | Chayanin Na-Chiangmai Napaporn Tiengchad Prathan Kittisakmontree Okorn Mekasuwandumrong Jonathan Powell Joongjai Panpranot |
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Affiliation: | (1) Department of Chemical Engineering, Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;(2) Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, 73000, Thailand;(3) International School of Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand; |
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Abstract: | Abstract An ultra-large pore mesocellular foam silica (MCF) was employed as a support for preparation of supported Pd catalysts for
the liquid-phase selective hydrogenation of phenylacetylene. The catalysts were prepared by three different routes: (i) incipient
wetness impregnation using Pd(II)acetate solution (Pd/MCF-imp), (ii) impregnation of colloidal Pd nanoparticles obtained by
the solvent reduction method (Pd/MCF-col), and (iii) in situ synthesis of MCF in the presence of the Pd colloid (Pd/MCF-ss).
The conventional impregnation method resulted in more agglomeration of Pd particles and partial collapse of MCF structure,
hence the Pd/MCF-imp exhibited the lowest selectivity towards styrene at total conversion of phenylacetylene. Only the Pd/MCF-ss,
in which most of the Pd nanoparticles were encapsulated by the silica matrix, was found to retain high styrene selectivity
(>80%) after complete conversion of phenylacetylene. Comparing to the other highly efficient Pd catalysts reported in the
literature under similar reaction conditions, it can be emphasized that coverage of Pd surface by the support produces great
beneficial effect for enhancing styrene selectivity, regardless of the type of supports used (i.e., TiO2, carbon nanotubes, or mesostructured silica). |
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