Fast X-ray photoelectron spectroscopy reveals that the efficient catalytic destruction of 1,1,1-trichloroethane
occurs over Pt{111} surfaces at temperatures as low as 150 K. Decomposition occurs via rapid, sequential
C−Cl bond scission to form an alkylidyne surface intermediate that in turn dehydrogenates above room
temperature. Atomic chlorine liberated during dehydrochlorination undergoes efficient reaction with surface
hydrogen, resulting in the evolution of gaseous HCl and small amounts of ethane, presumably via ethylidyne
hydrogenation. Irreversible dehydrogenation of residual hydrocarbon fragments results in significant surface
coking above 500 K.
Fast X-ray photoelectron spectroscopy reveals efficient C-Cl activation of 1,1,1-trichloroethane occurs over platinum surfaces at 150 K, and in the presence of hydrogen, sustained ambient temperature dehydrochlorination to HCl and ethane is possible over supported Pt/Al2O3 catalysts.
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