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- W170772213 abstract "The mechanism for the dissociation of CH4 on Ni(111) is studied by molecular beam techniques coupled with high resolution electron energy loss spectroscopy. The probability of the dissociative chemisorption of CH4 increases exponentially with the normal component of the incident molecule's translational energy and with vibrational excitation. Dissociation can also be induced by the impact of an Ar atom incident on a monolayer of CH4 physisorbed on Ni(111). The nascent products of the dissociation are identified as an adsorbed methyl radical and a hydrogen atom. The chemistry and stability of these adsorbed methyl radicals have also been studied. These results, which have shown that there is a barrier to the dissociative chemisorption, are interpreted in terms of a deformation model for the role of translational and vibrational energy in promoting dissociative chemisorption. The barrier arises largely from the energy required to deform the molecule sufficiently to allow a strong attractive interaction between the carbon and the Ni surface. Tunneling is suggested as the final process in the C-H bond cleavage. The presence of this barrier to dissociative chemisorption and collision-induced dissociation of adsorbates present plausible explanations for the pressure gap in heterogeneous catalysis." @default.
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- W170772213 date "1988-01-01" @default.
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- W170772213 title "The Mechanism for the Dissociation of Methane on a Nickel Catalyst" @default.
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- W170772213 doi "https://doi.org/10.1016/s0167-2991(09)60499-7" @default.
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