Carbon-Carbon Bond Activation in Cyclopropane by Energetic Forms of Hydrogen on the Ni(100) Surface

Electron-induced reactions in thin solid films of cyclopropane

“…Also, it is known that atomic hydrogen, which may be an intermediate in the transfer, can induce CÈC bond cleavage in cyclopropane. 35 An intermolecular radical reaction mechanism is also in line with the assumed formation of longer alkyl chains discussed above. More investigations are nevertheless necessary to obtain detailed information on the mechanism.…”

Physical origin of the high reactivity of subsurface hydrogen in catalytic hydrogenation

“…Hydrogenation is a process of immense scientific and technological importance. [1][2][3][4][5][6] In this regard, it has long been speculated that subsurface hydrogen has a reactivity distinct from surface hydrogen. 1 Some years ago, in a series of elegant experiments, Ceyer and co-workers 2 clearly demonstrated that on Ni͑111͒, subsurface hydrogen could hydrogenate adsorbed methyl to produce methane while surface hydrogen could not.…”

“…Since then, it has been found that subsurface hydrogen can hydrogenate other hydrocarbons while surface hydrogen is inactive. [3][4][5] Theoretical work [7][8][9][10] to date has mainly considered the dissociation of methane on Ni͑111͒, as well as coadsorption of methyl and subsurface hydrogen. But none has addressed the reaction pathways for the recombination reaction involving subsurface hydrogen, and a general explanation as to why subsurface hydrogen is more reactive than surface hydrogen is lacking.…”

Interaction of gas phase atomic hydrogen with Pt(111): Direct evidence for the formation of bulk hydrogen species

“…Because gas phase atomic hydrogen is 218.4 kJ/mol more energetic than molecular hydrogen (1/2 dissociation energy of H 2 ), when interacting with Pt(111), gas phase atomic hydrogen is energetic enough to overcome any activation energy to form all likely adsorbed H ad species (surface H ad species and bulk H ad species), surely including the active species for practical catalytic reactions. Gland et al [21][22][23][24][25] found that gas phase atomic hydrogen can undergo ring-opening reaction directly with cycloalkanes adsorbed on metal single crystal surfaces and that the ring-opening reaction follows Eley-Rideal mechanism. Therefore, even under UHV conditions, interaction of gas phase atomic hydrogen with Pt(111) can lead to the formation of detectable bulk H ad species.…”