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- W1970700057 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 decomposition. Cyclohexane shows a much higher decomposition starting temperature and lower decomposition fraction than other cyclic hydrocarbons, which can be explained on the basis of the difference in conformational energy to attain eclipsed C−H bonds on adjacent carbons in a transition state. Relating decomposition starting temperature with desorption energy, we have discussed the decomposition mechanism of hydrocarbons and proposed some candidates for transition state of decomposition." @default.
- W1970700057 created "2016-06-24" @default.
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- W1970700057 date "2000-08-19" @default.
- W1970700057 modified "2023-09-23" @default.
- W1970700057 title "Decomposition of Saturated Hydrocarbons Adsorbed on Ni(755): Comparison of Decomposition Starting Temperatures among Cyclic and Straight-Chain Hydrocarbons" @default.
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- W1970700057 doi "https://doi.org/10.1021/jp001137e" @default.
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