Study on reuse of metal oxide-promoted sulphated zirconia in acylation reactions |
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| Authors: | Michela Signoretto Antonella Torchiaro Anna Breda Francesco Pinna Giuseppina Cerrato Claudio Morterra |
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| Affiliation: | aChemistry Department, University Ca’Foscari, Calle larga S. Marta, 2137 I-30123 Venezia, Italy;bINSTM Consortium Firenze, UdR Venezia, Italy;cDepartment of Chemistry IFM – NIS Centre of Excellence, University of Torino, Via P. Giuria, 7 I-10125 Torino, Italy;dINSTM Consortium Firenze, UdR Torino, Italy |
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| Abstract: | A series of sulphated zirconia samples (SZ) promoted with Al2O3, Ga2O3, and Fe2O3 were synthesized by co-precipitation at constant pH and aged under reflux conditions. Structural, surface and catalytic properties of the samples were investigated using N2 adsorption/desorption, thermal analysis, in-situ FTIR spectroscopy, TPR–MS and EGA–MS measurements. The catalytic performance of promoted SZ in anisole acylation has been investigated. Promotion by either Fe2O3 or Ga2O3 was found to increase the catalytic activity (yield) after recycle of catalysts with respect un-promoted sample, whereas promotion by Al2O3 was observed to increase the conversion but not the yield. It is worth noting that all systems present high selectivity to the p-metoxyacetophenone product. |
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| Keywords: | Sulphated zirconia Friedel-Crafts acylation Fine chemicals Catalyst regeneration |
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