Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (06): 712-715.doi: 10.3866/PKU.WHXB20060613

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Catalytic Properties of Supported Pd/TiO2 and Pd-Ag/TiO2 Catalysts for Selective Hydrogenation of Acetylene

GU Hong;XU Bo-Lian;ZHOU Jing;LI Yuan-Zhi;FAN Yi-Ning   

  1. Key Laboratory for Mesoscopic Chemistry, Ministry of Education, Jiangsu Provincial Key Laboratory of Nanotechnology, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
  • Received:2005-11-18 Revised:2006-02-23 Published:2006-05-31
  • Contact: FAN Yi-Ning

Abstract: The structure and catalytic properties of supported Pd/TiO2 and Pd-Ag/TiO2 catalysts for selective hydrogenation of acetylene have been studied by using microreactor tests combined with temperature-programmed reduction (TPR), X-ray diffraction (XRD), infrared spectroscopy of adsorbed carbon monoxide (CO-IR), and electronic paramagnetic resonance (EPR). The results indicate that the Pd/TiO2 catalyst exhibits better catalytic performance than Pd/γ-Al2O3 catalyst for selective hydrogenation of acetylene, which can be correlated to the strong metal-support interaction (SMSI) between Pd and TiO2 in the Pd/TiO2 catalyst. Adding Ag component to Pd/TiO2 catalyst results in formation of Pd-Ag alloy, leading to an increase in selectivity of acetylene hydrogenation to ethylene, but a decrease in the activity of acetylene hydrogenation.

Key words: Pd, Pd-Ag alloy, Titania, Acetylene, Selective catalytic hydrogenation