Add time:08/20/2019         Source:sciencedirect.com

Vapor-phase dehydrogenation of 1-decanol to form decanal was performed over various supported Cu catalysts such as Cu/SiO2, Cu/ZnO, and Cu/Al2O3. Among the catalysts tested in this work, Cu/SiO2 showed a high and stable catalytic activity for the conversion of 1-decanol to form decanal, and 77.4% conversion of 1-decanol with 98.4% selectivity to decanal was achieved over Cu/SiO2 catalyst in N2 flow at 275 °C. The physical properties of SiO2 support affected the catalytic activity, and the SiO2 with a surface area of 451 m2 g−1 and an averaged pore size of 6 nm was preferable for the formation of decanal. The catalytic reaction was regulated by equilibrium: the pressure equilibrium constant, Kp, was estimated to be 0.30 atm at 275 °C. The deactivation of the catalyst was observed in N2 flow at 325 °C, while it was not observed in H2. The activity of the deactivated catalyst was completely recovered in N2 at 275 °C after calcination in air at 400 °C followed by H2 reduction. Based on the DRIFT and TG analyses, hydrocarbon species were accumulated on the catalyst surface in the initial period of the reaction. In addition, it was found that the dehydrogenation of the hydrocarbon species accumulated on the catalyst mainly caused the catalytic deactivation.

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