摘要
利用TPR(程序升温还原)、TPS(程序升温硫化)及恒温还原硫化技术研究了实验室制备的NiO-MoO_3/γ-Al_2O_3催化剂在不同硫化剂(H_2S、CS_2)硫化过程中的反应情形。实验结果表明,H_2S容易硫化氧化态样品,而CS_2/H_2容易硫化还原态样品。提出了还原硫化反应机理——H_2S可以直接通过S—O交换硫化样品,CS_2/H_2需要被加氢生成H_2S,再以后者硫化样品。CS_2/H_2的硫化过程是先还原后硫化。提出了以CS_2/H_2作硫化剂的硫化程序。
The sulfurization of NiO-MoO_3/γ-Al_2O_3 prepared by stepwise impregnation method in laboratory was studied by Temperature Pro grammed Technique with different sulfurizing agents(H_2S and CS_2).The more effective sulfurizing agent are H_2S for calcined catalyst and CS_2/H_2 for reduced one respectively,but with different sulfurization mechanism.H_2S sulfurizes the calcined sample by S—O exchange.CS_2/H_2 reduces the calcined sample and produces H_2S first on metal sites(mainly Ni-)then the nascent H_2S sulfurizes the sample.CS_2/H_2 follows a consecutive reduction and sulfurization procedure.The catalyst might reach the same sulfurization degree using different agents.An optimum sulfurization condition has been suggested:reducing the sample with H_2 up to a certain temperature between 300-400℃,then introducing high content CS_2/H_2 mixture and performing the sulfurization.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1991年第3期208-215,共8页
Journal of Fuel Chemistry and Technology
关键词
钼系
催化剂
硫化
Ni-Mo/Al_2O_3 catalyst
sulfurization
carbon disulfide
