Abstract
The effects of submonolayer deposits of titania on the activity and selectivity of a Rh foil catalyst for C2H4/CO/H2 reactions have been investigated. Reactions were carried out at 1 atm total pressure and at temperature of 488 K and 523 K. The addition of titania to the catalyst enhances the total rate of C3-oxygenate formation. This rate enhancement is due entirely to an increase in the rate of 1-propanol formation, which reaches a maximum at a TiOx. coverage of 0.2 ML. The rate of propanal formation, by contrast, is not enhanced. The rates of formation of methane, ethane, and C3-hydrocarbons also exhibit rate maxima at a TiOx. coverage of 0.2 ML. The rates of formation of C4- and C5-hydrocarbons, on the other hand, are suppressed by titania addition. The higher rate of 1-propanol production in the presence of titania is attributed to an interaction between Ti3+ ions at the edge of TiOx. islands and the carbonyl bond of adsorbed C3-oxygenated species. Such interactions are envisioned to facilitate hydrogenation of the carbonyl bond.
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