Kinetics for dehydrogenation of propane on Pt-Sn-K/gamma-Al2O3 catalyst

The performance of three catalysts, namely Pt/gamma-Al2O3, Pt-Sn/gamma-Al2O 3 and Pt-Sn-K/gamma-Al2O3 for dehydrogenation of propane is discussed. All catalysts are found to be highly selective towards propene. PtSn-K/gamma-Al 2O3 appears to be the most stable and suitable catalyst for the dehydrogena tion of propane. PtSn/gamma-Al2O3 is also found to be superior to Pt/gamma- Al2O3. In the kinetic study, the reaction rate constants based on the numbe r of active sites are calcnlated from the apparent reaction rate constants and the number of metal active sites. The reaction rate constants for Pt/ga mma-Al2O3, Pt-Sn/gamma-Al2O3 and Pt-Sn-K/gamma-Al2O3 catalysts at 773 K are 0.48 x 10(-28), 0.67 x 10(-28) and 2.98 x 10(-28) moll(site.s.Pa), respect ively, In addition, for Pt-Sn-K/gamma-Al2O3, the frequency factor and the a ctivation energy are 6.14 x 10(-24) mol/(site.s.Pa) and 62.7 kJ/mol, respec tively.