Preparation of PtHY catalysts: Influence on the catalytic properties of the complexes used as platinum precursors |
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| Affiliation: | 1. University College London, Department of Chemistry, 20 Gordon Street, London, WC1H 0AJ, UK;2. Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Harwell Didcot, Oxon, OX11 0FA, UK;3. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ve?na pot 113, 1000, Ljubljana, Slovenia;4. Instituto de Catálisis y Petroleoquímica, ICP-CSIC, C/ Marie Curie, 2, 28049, Madrid, Spain;1. Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic–Organic Hybrid Functional Material Chemistry, Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, China;2. School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150080, China |
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| Abstract: | Three cation complexes: Pt(NH3)4]2+, Pt(NH3)2 (H2O)2]2+ and Pt(H2O)4]2+ were used for the preparation of 0.6 wt.-% PtHY catalysts. The platinum dispersion depended on the platinum complex used as a precursor and, for a given complex, on the conditions of activation. The platinum dispersion of the catalysts prepared from the tetra-aquo platinum complex was very low, but this could be related to the great lability of the water ligands. It was also this lability which explained why the platinum dispersion was about twice as low for PtHY catalysts prepared from the diaquo-diammine complex than for those prepared from the tetra-ammine complex. However in the case of the two latter complexes, the activation conditions influenced the platinum dispersion in the same way: a highly marked effect of the calcination conditions and a small effect of the subsequent treatment under hydrogen flow. The behaviour of the PtHY catalysts for the bifunctional transformation of n-heptane did not depend on the platinum precursor. The activity and the selectivity of these catalysts depended only on their hydrogenating activity. |
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