有机官能化MSU-x介孔分子筛的界面特征

• 作 者: 巩雁军 李志宏 吴东 孙予罕
• 机 构: 中国科学院山西煤炭化学研究所!煤转化国家重点实验室 太原 030001,中国科学院山西煤炭化学研究所!煤转化国家重点实验室 太原 030001,中国科学院山西煤炭化学研究所!煤转化国家重点实验室 太原
• 出 处: 物理化学学报
• 发表日期: 2001年01期
• 关键词: 介孔分子筛 MSU-x 官能化 界面特征 模板剂 分子筛骨架 介孔材料 表面性质 催化活性 有机官能团

Organically modified MSU- x mesophases containing phenyl, ureidopropyl and methyl along with phenyl two moieties were directly prepared by one- pot synthesis method. Their texture and surface properties were characterized by means of XRD, HRTEM, FT- IR, N2 adsorption/desorption, 29Si CPMAS NMR、 13C CPMAS NMR and the microscopic structure was also characterized by small angle X- ray scattering (SAXS) using synchrotron radiation as X- ray source. The results showed that SAXS profiles were hardly constant with Porod′ s law showing a negative slope, i.e. negative deviations (see fig.3). This suggested that the organic groups covalently linked with the matrix of mesoporous silica formed an interfacial layers, which led to the scattering of the pore distortion and gave a negative diviation from Porod′ s law. The average thickness of the interfacial layer in each sample was further obtained by analyzing this deviation. SAXS analysis also showed that the organically functionalized MSU- X displayed mass fractal and the uniform distribution of the organic groups within the mesoporous channels, implying that it′ s formation was a non- equilibrium and non- linear process.

Organically modified MSU-x mesophases containing phenyl, ureidopropyl and methyl along with phenyl two moieties were directly prepared by one-pot synthesis method. Their texture and surface properties were characterized by means of XRD, HRTEM, FT-IR, N2 adsorption / desorption, 29Si CPMAS NMR, 13C CPMAS NMR and the microscopic structure was also characterized by small angle X-ray scattering (SAXS) using synchrotron radiation as X-ray source. The results showed that SAXS profiles were hardly constant with Porod’s law showing a negative This suggested that the organic groups covalently linked with the matrix of mesoporous silica formed an interfacial layers, which led to the scattering of the pore distortion and gave a negative diviation from Porod’s law . The average thickness of the interfacial layer in each sample was further obtained by analyzing this deviation. SAXS analysis also showed that the organically functionalized MSU-X displayed mass fractal and the uniform distribution of the organic groups within the mesoporous channels, implying that it ’s formation was a non-equilibrium and non- linear process.