Thermal treatment effects on the Ru/CeO2 catalysts performance for partial hydrogenation of benzene
Thermal treatment effects on the Ru/CeO2 catalysts performance for partial hydrogenation of benzene
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DOI：
10.1016/j.apsusc.2008.04.097
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发表时间：
2008-08
影响因子：
6.7
通讯作者：
P. C. Zonetti;R. Landers;A. Cobo
中科院分区：
文献类型：
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作者：
P. C. Zonetti;R. Landers;A. Cobo
本研究的目的是研究Ru/ ceo2催化剂的制备条件（煅烧温度和/或还原）对TiCl3存在下苯部分加氢反应性能的影响。采用初始湿浸渍法制备了氯化前驱体催化剂。反应发生在有水存在的三相反应介质中，温度373K，压力5.0MPa。煅烧催化剂的程序升温还原（TPR）谱图表明氧化钌的存在。x射线光电子能谱（XPS）分析证实了这一假设，表明在673K下煅烧的样品中钌以ruo2的形式出现，而在773K下还原的固体中钌以金属态出现。然而，煅烧或不进行还原都严重影响了催化性能。反过来，直接还原导致Ru/ ceo2催化剂更活跃，以及在整个反应中更高的环己烯产率。
The aim of this work is to study the effect of the preparation conditions of Ru/CeO2catalyst (calcination temperature and/or reduction) over the performance in the partial hydrogenation of benzene reaction in the presence of TiCl3. The catalysts were prepared through chlorinated precursors by incipient wetness impregnation method. The reaction occurred in three-phase reactional medium in presence of water at 373K and 5.0MPa. Temperature programmed reduction (TPR) profiles of calcinated catalysts indicate the presence of oxidated ruthenium. X-ray photoelectron spectroscopy (XPS) analysis confirms this supposition, showing that the ruthenium appears in the form of RuO2for the sample calcinated at 673K, while for the reduced solid at 773K, the Ru appears in the metallic state. However, the calcination step followed or not by reduction, strongly hinders the catalytic performance. In its turn, the direct reduction leads to a more active Ru/CeO2catalysts, as well as higher cyclohexene yields throughout all the reaction.