73
alcohol reforming reactions cannot take place. Similarly, the prod-
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are like to those seen in molecular beam experiments [10,11], and
from the photocatalytic reforming itself [4,12].
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None of the alcohols investigated showed any dehydrogena-
tion products or C C bond dissociation over the TiO2 surface.
Instead, reaction involved bimolecular and monomolecular dehy-
dration producing ether and alkene compounds. The presence of
Pd nanoparticles changes the product distribution dramatically,
yielding the dehydrogenation/decarbonylation products character-
istic of Pd activity. For ethanol, the dehydration products were
not observed when Pd was present, indicating that the adsorbed
species diffuse to Pd where they decarbonylate before they can
dehydrate on the oxide surface. For longer chain alcohols, diffu-
sion is restricted due to the bulkier structure and the competing
dehydration pathways are still observed in the presence of Pd.
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