caa a22 4500 445387904 CHVBK 20180317143037.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11144-011-0297-0 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0297-0 Supported dodecaphosphotungstate and undecaphosphotungstate: a study on the kinetic behavior for the oxidation of styrene [Elektronische Daten] [Pragati Shringarpure, Anjali Patel] Zirconia supported dodecaphosphotungstate and undecaphosphotungstate were successfully used as heterogeneous catalysts for the liquid-phase solvent-free oxidation of styrene. A detailed kinetic study was carried out in order to study the effect of removal of one addenda atom from the parent Keggin unit. The supported catalysts were also systematically characterized by various physicochemical techniques to show that the Keggin unit remains intact even after supporting on the support. Thermal studies also indicate that the supported catalysts are stable up to 450°C. Maximum conversion with a single selective product was obtained after 30h for the undecaphosphotungstate and after 20h for dodecaphosphotungstate. The rate constants as well as the activation energy for the reaction were determined. From the values of activation energy derived from the Arrhenius plot, different thermodynamic parameters such as enthalpy and Gibbs free energy were also calculated. From the above studies, supported dodecaphosphotungstate was found to be more active as compared to undecaphosphotungstate. Akadémiai Kiadó, Budapest, Hungary, 2011 Dodecaphosphotungstate nationallicence Undecaphosphotungstate nationallicence Oxidation nationallicence Kinetics nationallicence Styrene nationallicence Shringarpure Pragati Department of Chemistry, Faculty of Science, M. S. University of Baroda, 390 002, Vadodara, India aut Patel Anjali Department of Chemistry, Faculty of Science, M. S. University of Baroda, 390 002, Vadodara, India aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 165-180 1878-5190 103:1<165 2011 103 11144 https://doi.org/10.1007/s11144-011-0297-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0297-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shringarpure Pragati Department of Chemistry, Faculty of Science, M. S. University of Baroda, 390 002, Vadodara, India aut NATIONALLICENCE 700 1- Patel Anjali Department of Chemistry, Faculty of Science, M. S. University of Baroda, 390 002, Vadodara, India aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 165-180 1878-5190 103:1<165 2011 103 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer