Abstract
The surface chemistry of saturated hydrocarbons (cyclic and straight-chain ones between C5 and C8) adsorbed on a stepped Ni(755) {Ni(S)[6(111) × (100)]} has been investigated mainly with temperature-programmed desorption (TPD). Coadsorbed CO shows several significant effects on decomposition of hydrocarbons (e.g., promoting effect on decomposition of “low-reactivity” hydrocarbons). By using these effects of CO, we have determined desorption energy, decomposition fraction, ratio of desorption-limited H2 peak area to reaction-limited one, and decomposition starting temperature of hydrocarbons. These quantities are very dependent on molecular structure. The decomposition starting temperature of straight-chain hydrocarbons increases only slightly with increase of carbon atom numbers, suggesting that activation energy for decomposition is similar for all the straight-chain hydrocarbons and only part of the chain reorients regardless of chain length by rotation about C−C bond in a transition state for decomposi...
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