物理化学学报 >> 2006, Vol. 22 >> Issue (06): 712-715.doi: 10.3866/PKU.WHXB20060613

研究论文 上一篇    下一篇

负载型Pd/TiO2和Pd-Ag/TiO2催化剂的乙炔选择性加氢催化性能

顾虹;许波连;周静;李远志;范以宁   

  1. 南京大学化学化工学院, 介观化学教育部重点实验室, 江苏省纳米技术重点实验室, 南京 210093
  • 收稿日期:2005-11-18 修回日期:2006-02-23 发布日期:2006-05-31
  • 通讯作者: 范以宁 E-mail:Chem612@nju.edu.cn

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 E-mail:Chem612@nju.edu.cn

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摘要： 利用程序升温还原(TPR)、X-射线衍射(XRD)、CO吸附-红外光谱(CO-IR)、电子顺磁共振(EPR)和微型催化反应评价等手段, 研究了负载Pd/γ-Al2O3, Pd/TiO2和Pd-Ag/TiO2催化剂的结构和乙炔选择性加氢催化性能. 结果表明, Pd/TiO2催化剂具有较Pd/γ-Al2O3催化剂更优良的乙炔选择性加氢催化性能, 这与Pd-TiO2之间的强相互作用密切相关. Pd-TiO2之间的强相互作用不仅使负载型钯金属催化剂具有较高的乙炔加氢催化选择性, 而且具有较高的乙炔加氢催化活性. Pd/TiO2催化剂中添加Ag 组分后, Pd金属可促进Ag+的还原并可能形成Pd-Ag合金, 催化剂的乙烯选择性虽有所增加, 但乙炔转化率和乙烯收率下降.

关键词: 钯, 钯-银合金, 二氧化钛, 乙炔, 催化选择性加氢

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