CoNiMo/MCM-41催化的二苯并噻吩加氢脱硫反应

 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。

HYDRODESULFURIZATION OF DIBENZOTHIOPHENE CATALYZEDBY CoNiMo/MCM-41

The hydrodesulfurization (HDS) of dibenzothiophene (DBT) catalyzed by siliceous MCM-41 supported NiMo, CoMo and CoNiMo sulfides were studied by using a modal fuel containing 0.8 wt% DBT in decalin. The results indicated that the HDS of DBT over NiMo/MCM-41 occurred mainly through hydrogenation pathway, whereas the desulfurization of DBT predominately took the pathway of direct desulfurization over CoMo/MCM-41 and CoNiMo/MCM-41. The HDS activity of NiMo/MCM-41 was much higher than that of CoMo/MCM-41 or CoNiMo/MCM-41. CoNiMo/MCM-41 exhibited similar HDS performance to CoMo/MCM-41, and no dual promoting effect was observed for CoNiMo/MCM-41. The UV-Vis results suggested that interaction between Co and Mo was stronger than between Ni and Mo. Therefore, Mo prefers to react with Co in CoNiMo/MCM-41, leading to the formation of the active sites similar to those of CoMo/MCM-41, and finally resulting in the similar catalytic behavior between CoNiMo/MCM-41 and CoMo/MCM-41.