全硅MCM-41担载的加氢脱硫催化剂的TPR研究

用TRP技术研究了以全硅MCM-41(Si-MCM-41)和HNO3交换的全硅MCM-41(H-MCM-41)为载体制备的Ni-Mo、Co-Mo和Ni-W加氢脱硫(HDS)催化剂的还原性能，并以0．8(wt)％二苯并噻吩(DBT)的十氢萘溶液为模型化合物，在高压固定床反应器上考察了上述催化剂的加氢脱硫(HDS)反应性能。结果表明，Si-MCM-41经稀HNO3交换后，所担载的Ni-Mo和Ni-W催化剂还原性能、HDS活性和加氢活性有显著变化，但对Co-Mo催化剂影响不大。这说明在Ni-Mo／H-MCM-41和Ni-W／H-MCM-41中可能存在氢溢流现象，DBT的HDS活性与载体表面酸性和氢溢流有关。

TPR Study on Hydrodesulfurization Catalysts Supported over Siliceous MCM-41

TPR technique was used to study the reduction behavior of Ni-Mo,Co-Mo and Ni-W hydrodesulfurization (HDS) catalysts supported by Siliceous-MCM-41 (Si-MCM-41) and HNO\-3 ion exchanged Si-MCM-41 (H-MCM-41) supports.The HDS activity of the catalysts was evaluated by a model fuel containign 0.8(wt)% dibenzothiophene (DBT) in decalin.It is indicated that the reducibility,HDS activity and hydrogenation activity of the supported Ni-Mo and Ni-W catalysts changed significantly after Si-MCM-41 was ion exchanged with HNO\-3 solution.Nevertheless,only a little difference was observed for the supported Co-Mo sulfides.It can be concluded that there may exist the phenomenon of hydrogen spillover on the surface of Ni-Mo/H-MCM-41 and Ni-W/H-MCM-41,and both the acid properties of Si-MCM-41 as well as spillover hydrogen play important roles in the hydrodesulfurization of DBT.