Abstract
Dissociative chemisorption of methane on clean and oxygen modified Pd(110) has been studied by using molecular beam surface scattering. The absolute dissociation probability of CH 4 ( S tot) is found to increase exponentially with the incident normal energy ( E n) of CH 4 and with surface temperature ( T S) on clean Pd(110). The kinetic isotope effect is also found; namely, S tot of CD 4 is 4 to 5 times smaller than S tot of CH 4 throughout the entire range of E n studied. These results are consistent with a direct dissociation mechanism. Measurements on preadsorbed oxygen on Pd(110) show that S tot of CH 4 decreases linearly, as oxygen coverage is increased from 0 to 0.4 ML in good agreement with the first-order Langmuir kinetics when approximately two active sites are blocked by one oxygen atom. No influence of the oxygen induced surface reconstructions on the dissociative adsorption kinetics of CH 4 is observed.
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