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。
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 1.0 h^-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.
作者
夏道宏
陈金射
蔡婷婷
朱丽君
江胜娟
段尊斌
杨令彬
XIA Daohong;CHEN Jinshe;CAI Tingting;ZHU Lijun;JIANG Shengjuan;DUAN Zunbin;YANG Lingbin(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2019年第1期40-48,共9页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(Grant U1662115)资助
关键词
金属氢化物
正己烷异构化
催化剂
催化性能
反应机理
metal hydride
n-hexane isomerization
catalyst
catalytic performance
reaction mechanism
