Titanium-Promoted Rh-Mn-Li/SiO2 for C2-Oxygenates Synthesis from Syngas: Effect of Low Titanium Loading
Addition of small amounts of Ti oxide to Rh-Mn-Li/SiO2 catalysts unexpectedly results in an increase in their activity for C2-oxygenates production from syngas. Continuously increasing Ti loading depresses catalyst activity. The effect of Ti at low level on the catalytic properties in the CO/H2 reaction has been studied by various techniques. The characterization results indicate that the existence of Ti species has no effect on the ability of Rh to dissociate CO molecules and on the Rh dispersion. On the other hand, it is shown that trace amount of Ti strengthens the adsorption of CO and increases the amount of strongly adsorbed CO that can be hydrogenated and therefore improves the activity. The RhMn interaction intensity, which can be regulated by Ti doping, seems to be the main reason to achieve higher yield of the desired reaction products.
作 者： Weimiao Chen Yunjie Ding Dahao Jiang Zhendong Pan Hongyuan Luo 作者单位： Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 刊 名： 天然气化学（英文版） ISTIC SCI 英文刊名： JOURNAL OF NATURAL GAS CHEMISTRY 年，卷(期)： 2005 14(4) 分类号： O6 关键词： rhodium titanium CO hydrogenation C2-oxygenates syngas conversion