摘要
本文以六亚甲基亚胺(HMI)为模板剂,利用油浴加热和磁力搅拌实现的动态水热晶化合成法,通过改变硅铝物质的量之比(下文简称硅铝比,使用x表示)、晶化温度、晶化时间,研究MCM-56分子筛的合成规律。实验结果表明:硅铝比x=13.33时,因为不满足MCM-56分子筛晶体成核和生长所需的无机结构单元的条件,无法合成MCM-56分子筛;硅铝比x=16.67时,虽然138℃晶化5 d、7 d所得样品在晶面100、300、310出现了衍射峰,但结晶度不高,晶化并不完全,反应产物的结构主要为不定型态;当硅铝比x=20.20、晶化温度为138~145℃时,均可得到结晶态的MCM-56分子筛,138℃晶化7 d所合成样品的比表面积最大,为307.6 m^(2)/g。
The synthesis law of MCM-56 molecular sieve was studied by changing the SiO_(2)/Al_(2)O_(3),crystallization temperature and crystallization time under the conditions of oil bath heating and magnetic stirring reaction materials with HMI as template.The experimental results show that MCM-56 molecular sieves can not be obtained when the SiO_(2)/Al_(2)O_(3) is 13.33,the crystallization temperature is 138-145℃,and the crystallization time is 5-8 days.When the ratio of SiO_(2)/Al_(2)O_(3) is 16.67,although diffraction peaks appeare in the crystal faces of 100,300 and 310 after 5 days and 7 days of crystallization at 138℃,the crystallinity is not high and the crystallization is not complete,the main structure of the products is amorphous.When the ratio of SiO_(2)/Al_(2)O_(3) is 20.20 and the crystallization temperature is 138-145℃,the crystallized of MCM-56 molecular sieve can be obtained,and the specific surface area of the synthesized sample is 307.6 m^(2)/g under the condition of crystallization under 138℃for 7 days.
作者
郭泽平
董盼
刘金兰
康杰
曾敏玉
苏凯敏
林卿
何云
GUO Zeping;DONG Pan;LIU Jinlan;KANG Jie;ZENG Minyu;SU kaimin;LIN Qin;HE Yun(College of Physical Science and Technology,Guangxi Normal University,Guilin Guangxi 541004,China;College of Medical Information,Hainan Medical University,Haikou Hainan 571101,China)
出处
《广西师范大学学报（自然科学版）》
CAS
北大核心
2021年第3期83-91,共9页
Journal of Guangxi Normal University:Natural Science Edition
基金
国家自然科学基金(51901052)
广西高校研究生教育创新项目(XJGY2020017)
广西研究生教育创新计划项目(JGY2019034)
大学生创新创业训练计划项目(201910602081)
广西高校中青年教师科研基础能力提升项目(2020KY02022)。
关键词
分子筛
MCM-56分子筛
低硅铝比
比表面积
molecular sieve
MCM-56 molecular sieve
low SiO 2/Al_(2)O_(3)
specific surface area
