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Influence of rare earth promoters on the performance of Ni/Mg(Al)O catalysts for hydrogenation and steam reforming of toluene

查看全文 作　　者：ZHANG [1]Yuwen;CHENG [1]Hongwei;LU [1]Xionggang;DING [1]Weizhong;ZHOU [1,2]Guozhi 高影响力作者 机构地区：[1]Shanghai Key Laboratory of Modem Metallurgy and Materials Processing, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;[2]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China高影响力机构 出　　处：《Rare Metals》索引2009年第28卷第6期,共8页高影响力期刊 基　　金：supported by the National High Technology Research and Development Program of China (No.2006AA11A189);the Science and Technology Commission of Shanghai Municipality,China (Nos.0952nm01400 and 07DZ12036) 摘　　要：CeO2-, La2O3-, and ZrO2-promoted Ni/Mg(Al)O catalysts synthesized by hydrotalcite-type precursors have been investigated with respect to catalytic activity and carbon formation in the hydrogenation and steam reforming of toluene as a model tar compound. X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area and H2-temperature programmed reduction (TPR) were used to observe the characteristics of the prepared catalysts. The carbon formation and its amount on the used catalysts were examined by transmission electron microscope (TEM), scanning electron microscope (SEM) and thermogravimetric (TG). The trend of catalytic activity as derived from the experimental results followed the order: Ni-Ce>Ni-La>Ni-Zr>Ni. The catalyst modified with CeO2 exhibited the highest catalytic performance and had good carbon resistance in the hydrogenation and steam reforming of toluene. A toluene conversion of 96.8%, a CH4 yield of 45.2% and a CO yield of 50.4% have been achieved. The addition of promoters led to better dispersion of nickel species and higher interaction nickel-support, which were favorable for increasing the catalytic activity and effectively preventing carbon formation. 关 键 词：蒸汽重整 催化性能 催化剂 甲苯 加氢 镍 透射电子显微镜 扫描电子显微镜
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