Hydrogenation of carbon monoxide, aldehydes, and unsaturated hydrocarbons on titania-supported palladium catalysts.

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Pd/TiO<SUB>2</SUB> catalysts prepared by different methods showed quite different catalytic activities in the hydrogenation of CO and other unsaturated compounds. The catalyst prepared by coprecipitation of Pd acetate and titanium tetraisopropoxide contained smaller Pd particles than those in catalysts prepared by impregnation methods. In the hydrogenation of CO, activities of the catalysts increased with increase in the Pd dispersion. The coprecipitated catalyst was much more active for this reaction than the other catalysts and showed high activity for methanol formation under normal pressure. In the hydrogenation of propionaldehyde to 1-propanol, the catalysts showed similar behavior to that in the CO/H<SUB>2</SUB> reaction. However, in hydrogenation of C=C double bonds, the activity order of the catalysts was reverse. Higher activity was obtained on the impregnated catalysts with larger Pd particle size and this trend was stronger in hydrogenation of the conjugated butadiene and C=C bond in acrylaldehyde than in the hydrogenation of ethvlene.
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