高效ZSM-5-L二元复合分子筛的合成及正戊烷芳构化性能  

Synthesis of High Performance ZSM-5-L Composite Zeolite and Its Catalytic Properities for n-Pentane Aromatization

作　　者：万海[1,2,3] 张小雨[2] 张若杰[2] 张晓彤[2] 宋丽娟[1,2] 

机构地区：[1]中国石油大学(华东)化学工程学院,青岛266555 [2]辽宁石油化工大学辽宁省石油化工催化科学与技术重点实验室,抚顺113001 [3]中国石油抚顺石化公司石油三厂,抚顺113001

出　　处：《高等学校化学学报》2014年第10期2220-2226,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21076100)资助~~

摘　　要：通过优化水热陈化条件制备纳米L沸石,再采用水热合成结合原位二次晶化法,合成具有微-介复合孔结构的高效ZSM-5-L二元复合分子筛.考察了体系pH、二次晶化温度等因素对ZSM-5-L复合分子筛合成的影响,采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和傅里叶变换红外光谱（FTIR）等技术对复合分子筛进行表征,确定了最佳复合条件：pH=10.5-11.5,晶化温度170℃,晶化时间24 h.ZSM-5-L复合分子筛具有不同于ZSM-5沸石、L沸石及两者机械混合物的物性特征,且具有微-介复合孔结构.以正戊烷催化转化为探针反应,评价了ZSM-5-L复合分子筛轻烃芳构化反应性能.在相同反应条件下,ZSM-5-L复合分子筛具有优于2种单分子筛及二者机械混合物的正戊烷芳构化催化性能.Nano-sized L zeolite was synthesized via an improved hydrothermal synthesis method. On this basis, efficiently ZSM-5-L molecular sieves with micro-mesoporous hierarchically structure were obtained through the way of hydrothermal treatment incorporated with in situ recrystallization. X-Ray diffraction （ XRD）, scanning electron microscopy （ SEM）, transmission electron microscopy （ TEM ）, Fourier transform infrared spectroscopy（FTIR） were applied to characterize the effect of pH value and recrystallize temperature on the manufacture of the composite ZSM-5-L molecular sieves, and optimum synthesis conditions （ pH = 10.5-11.5, crystallization temperature 170 ℃, crystallization time 24 h） were confirmed. The structure of the as-synthesized composite ZSM-5-L molecular sieves was micro-mesoporous hierarchically, which was different from that of pure L zeolite, ZSM-5 zeolite and their mechanical mixture zeolite. The light hydrocarbon aromatization properties of the composite ZSM-5-L molecular sieves were evaluated via a n-pentane probe reaction. Compared with the properties of L zeolite, ZSM-5 zeolite and their mechanical mixture zeolite catalyst, the composite ZSM-5-L molecular sieves show superior catalytic performances in aromatization, and exhibit potentially applications as a catalyst in light hydrocarbon aromatization field.

关 键 词：水热晶化法 L沸石 ZSM-5沸石 复合分子筛 芳构化 

分 类 号：O643.36[理学—物理化学]