介孔H[P,Al]-ZSM-5分子筛上的苯甲醇自醚化反应  

Benzyl alcohol self-etherification reaction on mesoporous H[P,Al]-ZSM-5 zeolite

作　　者：田海锋[1] 马石子 吕金龙 查飞[1] 唐小华[1] 常玥[1] 郭效军[1] TIAN Hai-feng;MA Shi-zi;LYU Jin-long;ZHA Fei;TANG Xiao-hua;CHANG Yue;GUO Xiao-jun(College of Chemistry&Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu Province,China)

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070

出　　处：《化学工程》2020年第10期68-73,共6页Chemical Engineering(China)

基　　金：西北师范大学青年教师科研能力提升计划项目(NWNU-LKQN-18-21);甘肃省工业绿色低碳转型升级课题(GGLD-2019-062)。

摘　　要：酸性分子筛的催化性能受其微孔扩散限制的影响,通常将介孔引入分子筛可显著改善其传质效率。采用同晶取代和碱处理法,制备了H[P,Al]-ZSM-5-AT-0.05M催化剂样品,并分别采用XRD,N 2等温吸附-脱附和Py-IR等对制备的分子筛进行表征,其表面积、孔体积和P/Al(摩尔比)分别为328 m 2/g,0.23 cm 3/g和0.027。采用紫外分光光度法研究了苯甲醇在H[P,Al]-ZSM-5-AT-0.05M上的自醚化反应,其Thiele模数(∅)和效率因子(η)分别为0.08和16.9,证明由于H[P,Al]-ZSM-5-AT-0.05M分子筛中介孔的存在,使得苯甲醇自醚化反应具有较高的传质速率和较低的扩散限制。。The catalytic performance of acidic zeolites was affected by the diffusion limitation of the catalyst micropores.The mass transfer efficiency could be improved when mesopores were introduced into the zeolites.Mesoporous P substituted HZSM-5 zeolites(H[P,Al]-ZSM-5-AT-0.05M)were successfully synthesized by isomorphous substitution method and alkali treatment.It was characterized by means of XRD,N 2 adsorption-desorption and Py-IR.The surface area,pore volume and P/Al(molar ratio)of H[P,Al]-ZSM-5-AT-0.05M are 328 m 2/g,0.23 cm 3/g and 0.027,respectively.Moreover,its diffusion limitation was investigated with the self-etherification reaction of benzyl alcohol.The Thiele modulusφand efficiency factorηof benzyl alcohol self-etherification reaction on H[P,Al]-ZSM-5-AT-0.05M are 0.08 and 16.9,respectively.It was speculated that H[P,Al]-ZSM-5-AT-0.05M has a higher mass transfer rate and lower diffusion limitation for benzyl alcohol self-etherification reaction due to the presence of mesoporous.

关 键 词：分子筛 苯甲醇自醚化 Thiele模数 传质速率 扩散限制 

分 类 号：TQ426.94[化学工程]