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中文摘要：
采用分步浸渍法制备了TiO2改性的Ni-Mo/MCM-41加氢脱硫（HDS）催化剂，并以质量分数为0.8%的二苯并噻吩的十氢萘溶液作模型化合物，考察了TiO2及其引入顺序对Ni-Mo/MCM-41 HDS反应催化活性的影响。紫外/可见漫反射光谱（UV-Vis）、程序升温还原（TPR）以及NH3-TPD结果表明，TiO2的引入对Ni-Mo/MCM-41催化剂活性物种配位状态及其还原性能和酸性影响不显著。由HDS反应结果可以看出，引入TiO2虽然抑制了Ni-Mo/MCM-41的直接脱硫反应路径（DDS）的活性，但显著提高了其加氢反应路径（HYD）活性,进而提高了总的HDS反应活性。先引入Ni-Mo活性组分然后引入TiO2能更有效地提高催化剂HDS反应活性.根据反应产物组成分析，TiO2可能主要通过提高Ni-Mo/MCM-41硫化物酸性来提高催化剂的HYD和HDS活性。
英文摘要：
TiO2 modified Ni-Mo/MCM-41 hydrodesulfurization （HDS） catalysts were prepared by a consecutive impregnation method, and the effects of TiO2 as well as its introduction order on the HDS performance of Ni-Mo/MCM-41 were studied by using a model fuel of decalin containing 0.8% DBT. The UV-Vis, TPR and NH3-TPD results indicated that both the coordination states, the reducibility as well as the surface acidity of the oxidic precursor of Ni-Mo/MCM-41 were not remarkably affected by the introduction of TiO2. The HDS results showed that the addition of TiO2 suppressed the direct desulfurization pathway （DDS） activity of Ni-Mo/MCM-41, but significantly enhanced its hydrogenation pathway （HYD） activity, leading to an enhanced global HDS activity. The promoting effect was more pronounced when TiO2 was introduced after the impregnation of Ni-MO over MCM-41. On the base of the product compositions, it is suggested that the improved HYD and HDS activities of TiO2-containing Ni-Mo/MCM-41 catalysts may be attributed to the enhanced acidity of the sulfides.
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