Effect of Ag addition on the properties of Pd–Ag/TiO2 catalysts containing different TiO2 crystalline phases |
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| Authors: | Kunyaluck Kontapakdee Joongjai Panpranot Piyasan Praserthdam |
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| Affiliation: | aCentre of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand |
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| Abstract: | Anatase and rutile TiO2 were used for preparation of the TiO2 supported Pd and Pd–Ag catalysts for selective hydrogenation of acetylene. It was found that Pd/TiO2-anatase exhibited higher acetylene conversion and ethylene selectivity than rutile TiO2 supported ones. However, addition of Ag to Pd/TiO2-anatase catalyst resulted in lower ethylene selectivity while that of Pd/TiO2-rutile increased. It is suggested that Ag addition suppressed the beneficial effect of the Ti3+ sites presented on the anatase TiO2 during selective acetylene hydrogenation whereas without Ti3+, Ag promoted ethylene selectivity by blocking sites for over-hydrogenation of ethylene to ethane. |
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| Keywords: | Pd/TiO2 Pd– Ag/TiO2 Selective acetylene hydrogenation Crystalline phase |
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