Abstract
Deuterium tracing experiments of ethylene hydrogenation over platinum were conducted at temperatures from 248 to 333 K and D 2/C 2H 4 pressure ratios between 50:75 and 150:25 Torr. Information about the rates of adsorption/de sorption and hydrogenation processes on the surface was extracted by kinetic analysis of the deuterium tracing data combined with results from steady-state kinetic studies and temperature programmed desorption experiments. This analysis suggests that the essential surface chemistry can be described by a Horiuti-Polanyi mechanism that includes competitive and noncompetitive hydrogen adsorption pathways, each modified by a hydrogen activation step. The importance in these analyses of utilizing data from diverse experimental measurements is illustrated.
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