H2S对NiW/Al2O3和CoMo/Al2O3上二苯并噻吩和4,6-二甲基二苯并噻吩加氢脱硫反应的影响

 考察了H2S对NiW/Al2O3和CoMo/Al2O3上二苯并噻吩(DBT)和4,6-二甲基二苯并噻吩(DMDBT)加氢脱硫反应的影响. 结果表明,H2S同时抑制DBT和DMDBT两种硫化物的加氢脱硫反应,并且对DBT的抑制作用更为明显. 对于NiW/Al2O3和CoMo/Al2O3两种催化剂,H2S抑制了DBT和DMDBT的直接脱硫路径活性; 对于CoMo/Al2O3催化剂上DBT转化中的加氢反应也有抑制作用,但促进了DMDBT转化中加氢反应的进行. NiW/Al2O3催化剂更易受H2S的影响.

Effects of H2S on HDS Reaction of Dibenzothiophene and 4,6-Dimethyldibenzothiophene over NiW/Al2O3 and CoMo/Al2O3 Catalysts

The effects of H_2S on the catalytic activity of sulfided NiW/Al_2O_3 and CoMo/Al_2O_3 for hydrodesulfurization (HDS) reaction of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT) were investigated. The addition of H_2S inhibited the HDS reactivity of DBT and DMDBT, but the effect on the HDS action of DBT was more obvious. In the HDS reaction of DBT and DMDBT over NiW/Al_2O_3, H_2S inhibited the direct desulfurization and the hydrogenation routes. Similar inhibition occurred in the HDS reaction of DBT over CoMo/Al_2O_3, however, in the case of DMDBT, H_2S suppressed direct desulfurization route while promoted hydrogenation route. NiW/Al_2O_3 was more susceptible to H_2S than CoMo/Al_2O_3.