物理化学学报 >> 2006, Vol. 22 >> Issue (10): 1201-1205.doi: 10.3866/PKU.WHXB20061006

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HCl对有序介孔氧化硅结构与形貌的影响

赵春霞;陈文;刘琦;田高   

  1. 武汉理工大学材料科学与工程学院, 武汉 430070
  • 收稿日期:2006-03-15 修回日期:2006-05-08 发布日期:2006-10-11
  • 通讯作者: 陈文 E-mail:chenw@mail.whut.edu.cn

Influence of HCl on the Mesostructure and Morphology of the Ordered Mesoporous Silica

ZHAO Chun-Xia;CHEN Wen;LIU Qi;TIAN Gao   

  1. Institute of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China
  • Received:2006-03-15 Revised:2006-05-08 Published:2006-10-11
  • Contact: CHEN Wen E-mail:chenw@mail.whut.edu.cn

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摘要： 以三嵌段共聚物P123为有机模板导向剂、正硅酸乙酯TEOS为无机硅源, 在HCl存在的强酸性环境下, 采用水热法合成了有序介孔分子筛SBA-15. 采用XRD、SEM、TEM、N2吸附-脱附等手段对产物的结构与形貌进行了分析, 考察了HCl用量对有序介孔材料结构及形貌的影响. 结果表明, 在合成有序介孔氧化硅时, HCl发挥了催化和中间离子的双重作用, 促使棒状胶束形成六方有序排列, 降低SBA-15中微孔的数量, 而且对合成有序介孔氧化硅SBA-15的形貌有显著影响. 适宜的HCl用量对形成“珍珠链状”形貌的、热稳定性优良的SBA-15介孔材料具有重要作用.

关键词: 介孔氧化硅, 盐酸, 介孔结构, 形貌

Abstract: Ordered mesoporous molecular sieves SBA-15 were synthesized by hydrothermal reaction with TEOS as the source of inorganic silica and tri-block copolymer P123 as the template in strong acid media with HCl. Characteristics of the structure and micro-morphology of the synthesized samples were investigated by means of XRD, SEM, TEM, and N2 adsorption-desorption analysis. The results indicated that HCl played a role of catalyst in the synthesizing process. It could enhance the formation of hexagonal ordered arrangement of the surfactant micelles. HCl could reduce the number of micropores. Apporpriate amount of HCl was favourable to form the thermally stable SBA-15 with the morphology of pearl-like chains.

Key words: Mesoporous silica, HCl, Mesostructure, Morphology