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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
引用本文:顾忠华,罗来涛,夏梦君,李茂康.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[J].催化学报,2006,27(8):719-724.
作者姓名:顾忠华  罗来涛  夏梦君  李茂康
作者单位:南昌大学应用化学研究所,江西南昌,330047
基金项目:高等学校博士学科点专项科研项目;江西省教育厅科研项目;南昌大学校科研和教改项目
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:    二氧化钛  氧化铝  复合氧化物载体  焙烧温度  加氢脱硫
文章编号:0253-9837(2006)08-0719-06
收稿时间:01 18 2006 12:00AM
修稿时间:2006-01-18

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.Effect of Calcination Temperature of TiO2-Al2O3 Composite Oxide Support on Catalytic Performance of Au-Pd Catalyst for Hydrodesulfurization of Thiophene[J].Chinese Journal of Catalysis,2006,27(8):719-724.
Authors:GU Zhonghua  LUO Laitao  XIA Mengjun  LI Maokang
Institution:Institute of Applied Chemistry, Nanchang University, Nanchang 330047, Jiangxi, China
Abstract:TiO2-Al2O3 composite oxides were prepared by the sol-gel method and calcined at 773-1073 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.
Keywords:gold  palladium  titania  alumina  composite oxide support  calcination temperature  hydrodesulfurization
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