无机材料学报 ›› 2018, Vol. 33 ›› Issue (6): 629-634.DOI: 10.15541/jim20170340 CSTR: 32189.14.10.15541/jim20170340

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CTAB对多级孔分子筛合成及孔道层次结构影响

李红玑1,2, 周孝德1, 张建民2, 杨靖2, 王发良2, 王向阳2   

  1. 1. 西安理工大学水利水电学院, 西安 710048;
    2. 西安工程大学环境与化学工程学院, 西安 710048;
  • 收稿日期:2017-07-17 修回日期:2017-10-26 出版日期:2018-06-20 网络出版日期:2018-05-24
  • 基金资助:
    国家自然科学基金(21573171);陕西省重点研发计划(2017GY-121);陕西省教育厅专项科研计划(17JK0327);陕西省大学生创新创业计划(1715, 1731)

CTAB on Synthesis and Pore Structure of Hierarchical Zeolite

LI Hong-Ji1,2, ZHOU Xiao-De1, ZHANG Jian-Min2, YANG Jing2, WANG Fa-Liang2, WANG Xiang-Yang2   

  1. 1. Faculty of Water Resources and Hydraulic Power, Xi’an University of Technology, Xi’an 710048, China;
    2. School of Environment and Chemistry Engineering, Xi’an Polytechnic University, Xi’an 710048, China;
  • Received:2017-07-17 Revised:2017-10-26 Published:2018-06-20 Online:2018-05-24
  • Supported by:
    National Natural Science Foundation of China (21573171); Shaanxi Province Key Research and Development Plan (2017GY-121); Shaanxi Provincial Natural Science Foundation (17JK0327); Research and Innovation Training Project for Graduate in General Universities of Shaanxi Province (1715, 1731)

摘要:

以预处理后的凹凸棒石(Si-ATP)为前驱体, 采用双模板剂一步法合成了多级孔分子筛, 研究了结构导向剂十六烷基三甲基溴化铵(CTAB)用量对分子筛孔道层次结构和种类的影响。结果表明:当CTAB用量为0.01~0.03 g 或0.05~0.07 g时, 孔道层次结构因子(HF)与CTAB用量呈线性相关; XRD结果显示, 当CTAB用量为0.03~0.05 g时, 分子筛从ZSM-5型向(H)ZSM-11型转变, 这说明在利用此方法制备多级孔分子筛时, 可通过调变CTAB用量定向调控分子筛微介孔比例。CTAB用量为0.05 g, 合成的(H)ZSM-11分子筛比表面积(SBET)为432.02 m2/g, 总孔体积(Vtot)为0.40 cm3/g, 亚甲基蓝(MB)的吸附容量为366.45 mg/g, 说明CTAB导向构筑的介孔孔道有利于吸附大分子物质。

 

关键词: Si-ATP, CTAB, 多级孔分子筛, 孔道层次结构因子

Abstract:

Hierarchical zeolite was successfully synthesized with pretreated attapulgite (Si-ATP) by dual-template in one pot. Influence of the amount of structure-directing agent, hexadecyl trimethyl ammonium bromide (CTAB), on hierarchical pore structure and crystal morphology was systematically investigated. The results showed that the hierarchy factor (HF) had a good linear dependence on CTAB amount when it was between 0.01 and 0.03 g or 0.05 and 0.07 g. XRD revealed that the crystal morphology transferred from ZSM-5 to (H)ZSM-11 when CTAB amount ranged from 0.03 to 0.05 g. These results indicated that the ratio of micropore and mesopore could be controlled by CTAB amount when preparing hierarchical zeolites by this method. (H)ZSM-11 zeolites, prepared with 0.05 g of CTAB, exhibited a high specific surface area (SBET=432.02 m2/g), a large total volume (Vtot=0.40 cm3/g), and an adsorption capacity of methylene blue (MB) (366.45 mg/g). Therefore, the mesoporous pore built by CTAB is beneficial for adsorbing of macromolecules.

Key words: Si-ATP, CTAB, hierarchical zeolite, hierarchical factor

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