Abstract
Kinetic models are formulated to describe the essential surface chemistry involved in ethane hydrogenolysis over platinum catalysts, through consolidation of results obtained from first principles calculations and reaction kinetics studies. Quantum chemical calculations based on density functional theory (DFT) were conducted to probe the structures and energetics of various adsorbed C 2H x species on platinum, as well as activated complexes involved in cleavage of the CC bond. De Donder relations were used to identify kinetic coefficients that minimize complications from unintentional compensation effects. Results from DFT calculations and kinetic analyses suggest that the most abundant surface species during ethane hydrogenolysis are adsorbed atomic hydrogen and highly dehydrogenated hydrocarbon species (e.g. ethylidyne species), whereas the primary reaction pathways for cleavage of the CC bond on Pt take place through transition states that are more highly hydrogenated (e.g. C 2H 5 and CHCH 3 species). The results from DFT calculations indicate that C 2H x adsorbed species and transition states interact more strongly with Pt(2 1 1) than with Pt(1 1 1) surfaces, in agreement with the known structure sensitivity of ethane hydrogenolysis over Pt catalysts.
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