Abstract
Supported palladium nanocatalysts have been reported to be active in selective hydrogenation of acetylene. In this work, non-thermal radio frequency plasma modification has been applied to Pd/Al2O3 catalysts for selective hydrogenation of acetylene in the presence of excess ethylene. High ethylene selectivity, good acetylene conversion activity and high TOF were obtained on the plasma-treated catalysts. To understand the plasma effect, the catalysts were characterized by differential scanning calorimetry in hydrogen (H2-DSC), pulse H2 chemisorption, X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption with ethylene (C2H4-TPD) experiments. XPS and H2-DSC results confirmed that the Pd precursor could be effectively reduced to the metallic state during the room temperature plasma treatment. Plasma treatment also improved the dispersion of Pd particles with strong interaction between Al2O3 support and PdO and Pd nitrate precursors. In addition, C2H4-TPD indicated that plasma treatment could lead to an enhanced catalytic performance on selective hydrogenation of acetylene. It demonstrates that the non-thermal RF plasma treatment is an effective way to manipulate surface properties and the interaction between metals and supports of supported Pd catalysts for selective hydrogenation.
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Acknowledgements
The financial support of the NSF-REU program at TAMU-Commerce and Welch Foundation (Grant # T-0014) is acknowledged. A portion of this research was conducted at the Center for Nanophase Materials Sciences, sponsored at Oak Ridge National Laboratory (CNMS-ORNL User Project).
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Li, Y., Jang, B.WL. Selective Hydrogenation of Acetylene Over Pd/Al2O3 Catalysts: Effect of Non-thermal RF Plasma Preparation Methodologies. Top Catal 60, 997–1008 (2017). https://doi.org/10.1007/s11244-017-0765-5
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DOI: https://doi.org/10.1007/s11244-017-0765-5