【摘要】 采用浸渍还原法制备了一种新型镍氢化物/分子筛（NiH/Hβ）烷烃异构化催化剂,考察了催化剂制备条件及反应条件对其催化正己烷异构化性能的影响。结果发现,当活性组分质量分数为0.5%,反应温度为300℃,反应压力为2.0MPa,氢/油摩尔比为4.0及质量空速为1.0h^-1时,NiH/Hβ催化剂催化正己烷异构化活性最优,正己烷的转化率为83.0%,异构烷烃的选择性与收率分别达到78.6%、65.2%。根据实验结果,提出了NiH/Hβ催化剂催化正己烷异构化反应机理,证明NiH金属活性中心具有良好的加氢/脱氢功能。更多还原

【Abstract】 A novel NiH/Hβcatalyst for n-alkanes isomerization was prepared by impregnation method.Effects of catalyst preparation conditions and reaction conditions on the catalytic performance of catalyst in n-hexane isomerization were investigated.It is found that when the mass fraction of NiH is 0.5%,reaction temperature is 300 ℃,reaction pressure is 2.0 MPa,H₂ to n-hexane molar ratio is 4.0 and MHSV is 1.0h^-1,the corresponding catalyst shows the best catalytic activity.The maximum conversion of n-hexane reaches 83.0%,while the selectivity and yield of isohexane obtain up to 78.6% and 65.2%,respectively.Based on the above results,the reaction mechanism of n-hexane isomerization was proposed.It is suggested that Ni-H species acting as metal active sites exhibit promising hydrogenation/dehydrogenation performance.更多还原