Abstract
The interaction of hydrogen with carbidic carbon deposited on Ni(100) by decomposing methane has been studied by isothermal hydrogenation experiments and by temperature-programmed hydrogen desorption (H2−TPD). The hydrogenation experiments were made in the hydrogen-pressure range 0.5–10 Torr and the temperature range 450–550 K. The hydrogenation curves indicate the presence of carbon states with different reactivities. A kinetic model with carbon-state reactivities, which depend on the local carbon concentration, is compatible with the hydrogenation results. H2−TPD spectra were recorded for carbon coverages in the range 0–0.34 ML. Application of a simple kinetic expression shows that the “effective” hydrogen binding energy of the model depends on both the carbon and the hydrogen coverage.
Published Version
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