Abstract: Catalysts with different Ni content supported on activated alumina， γ-Al2O3 with surface area of 241 m2/g，were prepared via traditional volume impregnation method. The catalysts Ni/γ-Al2O3 were characterized by XRD，SEM and BET. Dehydrogenation of methylcyclohexane (MCH) catalyzed by Ni/γ-Al2O3 was performed under a fixed-bed micro reactor. Experimental results showed that the dehydrogenation conversion of MCH can be reached to 94.58% and the selectivity to toluene formation is 100% by using 20% Ni/γ-Al2O3 catalyst at 653 K and 0.5 MPa with v(MCH)/v(N2) of 7/12 and the volume gas space velocity of 212 h－1. These Ni-based catalysts are feasible to replace platinum and other noble metal catalysts.

摘要： 采用自制的比表面积为241 m2/g的纳米γ-Al2O3为载体，用等体积浸渍法制备了不同Ni含量的Ni/γ-Al2O3催化剂，采用X射线衍射、扫描电镜、比表面积测定等手段对所制备的催化剂进行了表征。利用微型连续管式反应器，考察了Ni/γ-Al2O3催化剂对甲基环己烷（MCH）气相脱氢的催化性能。结果表明：使用负载量为20%的Ni/γ-Al2O3催化剂，在653 K、0.5 MPa，v(MCH)/v(N2)=7/12，混合进样体积空速212 h－1条件下，MCH脱氢转化率达到94.58%，产物甲苯的选择性接近100%。实验结果还表明，使用镍基催化剂替代铂等贵金属催化剂在储氢技术中具有较好的应用前景。