Abstract
The reaction rates for the vapor-phase hydrogenation of cyclohexene over Pt SiO 2 between 273 and 313 K are reported. The reaction is zero order with respect to cyclohexene. The reaction order with respect to hydrogen is 0.8 at low hydrogen pressures and temperatures and close to 0.5 at higher hydrogen pressures and temperatures. The shift in kinetics is explained by a Horiuti-Polanyi (1934, Trans. Faraday Soc. 30, 1164) mechanism, in which adsorption of hydrogen is equilibrated at high temperatures and pressures but becomes essentially irreversible at low temperatures and pressures. The reaction is structure insensitive as its rate does not change when Pt dispersion changes from 14 to 100%.
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