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以质量分数为0.8%的二苯并噻吩(DBT)的十氢萘溶液为模型化合物,考察了全硅MCM-41担载的CoMo、NiMo以及CoNiMo硫化物催化剂的加氢脱硫(HDS)反应性能。结果表明,DBT在NiMo/MCM-41催化剂上主要通过加氢反应路径脱硫,而在CoMo/MCM-41和CoNiMo/MCM-41催化剂上主要通过直接脱硫反应路径脱硫。NiMo/MCM-41催化剂的HDS活性远高于CoMo/MCM-41或CoNiMo/MCM-41催化剂。CoNiMo/MCM-41催化剂反应性能与CoMo/MCM-41催化剂相似,没有观察到明显的双助剂效应。根据紫外-可见漫反射光谱(UV-Vis)的测定结果,Co与Mo之间的相互作用比Ni与Mo之间的相互作用强,在CoNiMo/MCM-41催化剂中Co会优先与Mo结合,形成与CoMo/MCM-41催化剂中类似的活性相,表现出与CoMo/MCM-41催化剂相似的催化特性。
The hydrodesulfurization (HDS) reactivity of CoMo, NiMo and CoNiMo sulfides supported on all-silicon MCM-41 was investigated using decalin solution of dibenzothiophene (DBT) as the model compound. . The results show that DBT desulfurizes mainly on the NiMo / MCM-41 catalyst through the hydrogenation reaction path and desulfurization on the CoMo / MCM-41 and CoNiMo / MCM-41 catalysts mainly through the direct desulfurization reaction path. The HDS activity of NiMo / MCM-41 catalyst is much higher than that of CoMo / MCM-41 or CoNiMo / MCM-41 catalyst. The CoNiMo / MCM-41 catalyst exhibited similar reactivity to the CoMo / MCM-41 catalyst, with no apparent bumper effect observed. According to the results of UV-Vis measurement, the interaction between Co and Mo is stronger than the interaction between Ni and Mo. In the CoNiMo / MCM-41 catalyst, Co preferentially combines with Mo, A similar active phase was formed as in the CoMo / MCM-41 catalyst, exhibiting similar catalytic properties as the CoMo / MCM-41 catalyst.