二苯并噻吩在Mo_2N/Al_2O_3催化剂上的加氢脱硫

DIBENZOTHIOPHENE HYDRODESULFURIZATION ON ALUMINA-SUPPORTED NITRIDE CATALYST

氧化铝负载的氧化物前身物在N2 -H2 混合气中程序升温反应合成出负载型氮化钼催化剂 ,用二苯并噻吩作模型化合物评价了合成催化剂的加氢脱硫性能 ,与硫化钼催化剂相比 ,氮化钼催化剂有较好的加氢脱硫活性和选择CS键断裂的选择性。

The alumina-supported molybdenum nitride catalyst was obtained from the reaction of alumina-supported molybdenum oxide with the mixture of N2-H2 The result of dibenzothiophene hydrosulfurization shows that the alumina-supported molybdenum nitride catalyst is more active and selective CS bond breakage compared to molybdenum sulfided catalyst The dibenzothiophene hydrodesulfurization activity over nitride catalyst is dependent on the pretreatment of the catalyst The activity order is passivated-nitride≈sulfided nitride>reduced-nitride, which means that pre-reduction improve neither the activity nor the selectivity Presulfidization decreases the selectivity of nitride catalyst The products of the HDS of DBT over nitride catalyst have been identified by GC-MS and the reaction network of the HDS of DBT was suggested The selectivity measurement shows that the selectivity for biphenyl increases when increasing the reaction temperature but decreases when increasing the reaction contact time On the other hand, the selectivity for cycohexylbenzene increases when decreasing the reaction temperature and increasing the reaction contact time