KOH/NaOH两种碱性体系下合成纳米片层分子筛  

Synthesis of Nanosheets Zeolite in Two Alkaline Systems of KOH/NaOH

作　　者：邵秀丽[1,2] 王政[1,3] 张宇 田海洲 王文军 SHAO Xiuli;WANG Zheng;ZHANG Yu;TIAN Haizhou;WANG Wenjun(State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China;Xinhua College,Ningxia University,Yinchuan 750021,China;Analysis and Testing Centre,Ningxia University,Yinchuan 750021,China;Coal Chemical Industry Technology Research Institute,National Energy Group Ningxia Coal Industry Co.,Ltd.,Yinchuan 750411,China)

机构地区：[1]宁夏大学化学化工学院省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021 [2]宁夏大学新华学院,宁夏银川750021 [3]宁夏大学测试分析中心,宁夏银川750021 [4]国家能源集团宁夏煤业有限公司煤化工技术研究院,宁夏银川750411

出　　处：《石油学报（石油加工）》2024年第6期1507-1515,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：宁夏回族自治区教育厅高等学校科学研究项目(NYC2022101)基金资助。

摘　　要：以小分子阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为结构导向剂,在KOH和NaOH 2种碱性体系下水热合成纳米片层分子筛,并分析K^(+)、Na^(+)和Silicalite-1晶种溶胶对合成样品的物相和形貌的影响。结果表明:以KOH为碱源,在添加Silicalite-1晶种溶胶的条件下,水热晶化96 h即可合成高结晶度、纳米薄片沿b轴方向有序堆积多层和随机堆积单层的混合形貌ZSM-5分子筛;以NaOH为碱源,在不添加Silicalite-1晶种溶胶的条件下,水热晶化48 h即可合成高结晶度、由纳米薄片和纳米棒紧密堆积而成的纺锤状聚集体形貌MOR分子筛。研究结果可为进一步优化合成MOR和ZSM-5分子筛纳米片提供思路。Nanosheets zeolite was synthesized using small cationic surfactant cetyltrimethylammonium bromide(CTAB)as a structure-directing agent under two basic systems of KOH/NaOH.The effects of alkali metal ions(K^(+),Na^(+))and Silicalite-1 seed sol on the phase and morphology of synthesized samples were analyzed.The results show that ZSM-5 zeolite with high crystallinity may be hydrothermal crystallized for 96 hours under the use of KOH as the alkali source and the addition of Silicalite-1 seed sol,and possesses a mixed morphology of the multilamellar and unilamellar structure constituted of orderly stacked nanosheets along the b-axis and randomly stacked nanosheets,respectively.Nevertheless,MOR zeolite with high crystallinity and fusiform aggregate morphology,which consists of densely packed nanosheets and nanorods,can be synthesized by hydrothermal crystallization for 48 hours without the need of Silicalite-1 seed sol when using NaOH as the alkali source.The findings can offer suggestions for further optimizing the production of MOR and ZSM-5 nanosheets.

关 键 词：分子筛 纳米片 碱金属离子 晶种 十六烷基三甲基溴化铵 

分 类 号：O641.4[理学—物理化学]