Abstract
The reaction of C2H4 on Pt111 at 300 K has been investigated by
single crystal adsorption calorimetry. The initial heats of adsorption
and the initial sticking probability are 174 kJ/mol and 0.67 respectively.
The adsorption heat versus coverage data shows a remarkable minimum
which serves as a basis for a mechanism involving ethylidene (CHCH3)
as an intermediate for the formation of ethylidyne (C2H2) on the
PtIII surface. The coverage-dependent sticking probability strongly
indicates that adsorption is precursor mediated and is well-fitted
by the King and Wells expression. From the structure of the decomposition
species known to form on the PtIII surface, the average C-Pt bond
strength is found to be about 245 kJ/mol, although the actual value
is found to be species-dependent.
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