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Diffusion of coadsorbed CO and D on Ni(lOO)

✍ Scribed by D.A. Mullins; B. Roop; J.M. White

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
430 KB
Volume
129
Category
Article
ISSN
0009-2614

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✦ Synopsis

Pulsed laser he&ii has been used to desorb CO(a) and D(a), separately adsorbed and coadsorbed, from a 325 wrn radius spot on Ni(lOO). Refilling by diffusion Is temperature dependent, is slower for D(a) than for Co(a), and is slower for both when coadsorbed. From temperature-dependent data, both activation energies and preexponential factors are calculated. The importance of pre-exponential factor changes is stressed.

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Coadsorption of saturated hydrocarbons and CO has been investigated by temperature-programmed desorption (TPD). Coadsorbed CO promotes the decomposition of low reactive hydrocarbons during TPD. The coverage and decomposition fraction (ratio of decomposed molecules to adsorbed ones) are determined fr