Ni改性SAPO-11分子筛择形催化2-甲基萘烷基化制2,6-二甲基萘  

Shape selective catalysis of Ni modified SAPO-11 molecular sieve for alkylation of 2-methylnaphthalene to 2,6-dimethylnaphthalene

作　　者：冯刚 文志辉 周建林 邵松 刘清华 张荣斌 Feng Gang;Wen Zhihui;Zhou Jianlin;Shao Song;Liu Qinghua;Zhang Rongbin(College of Chemistry,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学化学学院,南昌330031

出　　处：《河南师范大学学报（自然科学版）》2022年第4期20-27,F0002,共9页Journal of Henan Normal University(Natural Science Edition)

基　　金：国家自然科学基金(21875096)。

摘　　要：采用水热法以n_(Al_(2)O_(3))∶n_(DPA(二正丙胺))∶n_(P_(2)O_(5))∶n_(SiO_(2))∶n_(H_(2)O)=10∶10∶10∶0.2∶43制备了SAPO-11分子筛,使用等体积浸渍法负载金属Ni改性SAPO-11分子筛.通过XRD,SEM,N_(2)吸附-脱附和NH_(3)-TPD对SAPO-11分子筛催化剂进行了理化性质的表征.在400℃,3.5 MPa,2-甲基萘(2-MN)重时空速(WHSV)为0.5 h~(-1)的条件下,考察了负载Ni不同量的SAPO-11分子筛催化剂的烷基化活性.结果表明,2%Ni/SAPO-11分子筛催化剂具有最高的选择性及2,6-/2,7-DMN比(即2,6-二甲基萘(2,6-DMN)和2,7-二甲基萘(2,7-DMN)的物质的量之比),反应7 h后,分别可以达到46%和2.04.SAPO-11分子筛有高活性与其具有适中的孔径和温和的酸强度密不可分.The SAPO-11 molecular sieve with n Al_(2)O_(3)∶n DPA∶n P_(2)O_(5)∶n SiO_(2)∶n H_(2)O=10∶10∶10∶0.2∶43 was prepared by hydrothermal method,and then the SAPO-11 molecular sieve was modified with Ni,loaded by impregnation method.The samples were examined by XRD,SEM,N 2 adsorption-desorption and NH_(3)-TPD to characterize physical and chemical properties of SAPO-11 molecular sieve catalyst.Under the conditions of 400℃,3.5 MPa,and 2-methylnaphthalene(2-MN)weight hourly space velocity(WHSV)of 0.5 h^(-1),the alkylation activities of catalysts were investigated.The results show that the 2%Ni/SAPO-11 molecular sieve catalyst has the best selectivity and the 2,6-/2,7-DMN ratio(molar ratio of 2,6-DMN and 2,7-DMN),which can reach 46%and 2.04,respectively.The high activity of SAPO-11 molecular sieve could be attributed to its moderate pore size and mild acidity.

关 键 词：2 6-二甲基萘 SAPO-11分子筛 烷基化 择形催化 

分 类 号：TQ241.5[化学工程—有机化工]