催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (8): 719-724.

• 研究论文 • 上一篇    下一篇

TiO2-Al2O3复合氧化物载体焙烧温度对Au-Pd催化剂加氢脱硫性能的影响

顾忠华,罗来涛,夏梦君,李茂康   

  1. 南昌大学应用化学研究所, 江西南昌 330047
  • 收稿日期:2006-08-25 出版日期:2006-08-25 发布日期:2010-09-28

Effect of Calcination Temperature of TiO2-Al2O3 Composite Oxide Support on Catalytic Performance of Au-Pd Catalyst for Hydrodesulfurization of Thiophene

GU Zhonghua, LUO Laitao*, XIA Mengjun, LI Maokang   

  1. Institute of Applied Chemistry, Nanchang University, Nanchang 330047, Jiangxi, China
  • Received:2006-08-25 Online:2006-08-25 Published:2010-09-28

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摘要： 采用溶胶-凝胶法制备了介孔TiO2-Al2O3复合氧化物载体,考察了载体的焙烧温度对负载型Au-Pd双金属催化剂加氢脱硫性能的影响,并采用X射线衍射、吸附吡啶的程序升温脱附、程序升温还原、红外光谱和N2物理吸附等技术对载体及催化剂进行了表征. 结果表明,不同温度焙烧的TiO2-Al2O3复合载体都具有介孔结构,其中773 K焙烧制得的TiO2-Al2O3复合载体的比表面积和孔容较大, B酸中心较多,以其为载体的Au-Pd 催化剂具有较好的加氢脱硫活性. 表征结果表明, 773 K焙烧制得的Au-Pd/TiO2-Al2O3催化剂中Au-Pd活性组分与载体的相互作用较强,催化剂上形成的AuxPdy合金的晶粒较小且数量较多,催化剂的酸量和活性组分的分散度较大,并且其上进行的加氢脱硫反应的活化能较低,这些因素均有利于催化剂活性的提高.

关键词: 金, 钯, 二氧化钛, 氧化铝, 复合氧化物载体, 焙烧温度, 加氢脱硫

Abstract: TiO2-Al2O3 composite oxides were prepared by the sol-gel method and calcined at 773-1?073 K. The influence of calcination temperature of the composite oxide on the catalytic performance of Au-Pd/TiO2-Al2O3 catalyst for the hydrodesulfurization of thiophene was studied. The prepared samples were characterized by X-ray diffraction, temperature-programmed desorption of adsorbed pyridine, temperature-programmed reduction, infrared spectroscopy, and nitrogen adsorption. The results showed that all the TiO2-Al2O3 samples were mesoporous materials, and the TiO2-Al2O3 calcined at 773 K had larger BET surface area and pore volume, and more Bronsted acid centers. Au-Pd/TiO2-Al2O3 catalysts showed good activity for the hydrodesulfurization of thiophene. The Au-Pd supported on the TiO2-Al2O3 calcined at 773 K showed the highest activity because of the stronger metal-support interaction, the more AuxPdy active centers formed on the catalyst surface and Bronsted acid sites, the higher metal dispersion, and the lower apparent activation energy.

Key words: gold, palladium, titania, alumina, composite oxide support, calcination temperature, hydrodesulfurization