Selective hydrogenation of acetylene over Pd/CeO₂

Abstract

Five hundred ppm Pd/CeO₂ catalyst was prepared and evaluated in selective hydrogenation of acetylene in large excess of ethylene since ceria has been recently found to be a reasonable stand-alone catalyst for this reaction. Pd/CeO₂ catalyst could be activated in situ by the feed gas during reactions and the catalyst without reduction showed much better ethylene selectivity than the reduced one in the high temperature range due to the formation of oxygen vacancies by reduction. Excellent ethylene selectivity of ~100% was obtained in the whole reaction temperature range of 50°C–200°C for samples calcined at temperatures of 600°C and 800°C. This could be ascribed to the formation of Pd_xCe_1−xO_2−y or Pd-O-Ce surface species based on the X-ray diffraction and X-ray photoelectron spectroscopy results, indicating the strong interaction between palladium and ceria.

Key words： selective hydrogenation; acetylene; Pd/CeO₂; strong interaction

Acknowledgments

This work is partially supported by Welch Foundation (#T-0014) and the CNMS user program of the Oak Ridge National Laboratory. Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund for partial support of this research, ACS PRF (#57596-UR5).

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