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 character...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.展开更多
采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从...采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从而抑制了烯烃双键异构化反应,提高歧化反应的活性和选择性。在400℃、0.5MPa,1-丁烯的质量空速为10h-1的反应条件下,1-丁烯自动歧化反应的转化率可达50%,目标产物(乙烯+丙烯+己烯)选择性达80%以上。展开更多
文摘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.
文摘采用自制的高比表面MSU介孔分子筛为载体,制备了系列歧化催化剂,对其进行XRD、N2吸附-脱附、H2-TPR和29Si MAS NMR表征,并评价了其1-丁烯歧化反应性能。结果显示高比表面载体和合适的WO3负载量有利于提高活性组分在载体表面的分散度,从而抑制了烯烃双键异构化反应,提高歧化反应的活性和选择性。在400℃、0.5MPa,1-丁烯的质量空速为10h-1的反应条件下,1-丁烯自动歧化反应的转化率可达50%,目标产物(乙烯+丙烯+己烯)选择性达80%以上。
