Ru作为Co-Mo/Al_2O_3加氢脱硫催化剂助剂的研究

Studies on Ruthenium Used as the Promoter of Co-Mo/Al_2O_3 Catalyst in Hydrodesulfurization

用Ru改性的Ru-Co-Mo/Al_2O_3对噻吩加氢脱硫的催化性能进行了考察。结果表明,与Co-Mo/Al_2O_3相比,Ru-Co-Mo/Al_2O_3的加氢脱硫活性增高。通过CO、NO吸附的红外光谱实验证实,由于Ru的加入,吸附在Co和Mo中心上的特征谱带向低波数移动,且峰强度增强,这些结果提出了在硫化态Ru-Co-Mo/Al_2O_3上,Ru中心的部分d电子转移到Co、Mo中心的周围或由于Ru的存在促进了Co、Mo中心的还原。

Catalytic performance of Ru-Co-Mo/Al2O3 and Co-Mo/Al2O3 catalysts in thiophene conversion as a model reaction of hydrodesulfurization has been performed, and it is shown that the conversion of thiophene on Ru-Co-Mo/Al2O3 catalyst is 2 times of that/on Co-Mo/Al2O3. The infrared adsorption of CO and NO on the catalysts reveals that the frequencies of CO and NO adsorbed on Co, Mo sites of Ru-Co-Mo/Al2O3 were shifted to low wavenumbers and their intensities were increased, in contrast to those on Co-Mo/Al2O3 catalyst. It is suggested that some d electrons of ruthenium in Ru-Co-Mo/Al2Os were transferred into Co, Mo sites, leading to an increase of CO and NO adsorption abilities.