Direct synthesis of highly ordered Co-SBA-15 mesoporous materials by the pH-adjusting approach
作者： Zhensong Lou , Ruiheng Wang , Hui Sun , Yuan Chen , Yanhui Yang
DOI: 10.1016/J.MICROMESO.2007.06.020
关键词:
摘要: Abstract Cobalt-substituted SBA-15 (Co-SBA-15) mesoporous materials were directly synthesized under mild conditions (pH > 2.0) by a “pH-adjusting” method using sodium hydroxide. Characterization results, such as powder X-ray diffraction (XRD), N 2 physisorption and high-resolution transmission electron microscopy (HRTEM), showed that the resultant exhibit highly ordered hexagonal structures, which was strongly correlated to pH in synthesis solution. The Co-SBA-15 sample obtained at of 3.0 gave best structure. Solid state magic-angle-spinning nuclear magnetic resonance (MAS NMR) results indicated less condensation higher pH. In addition, also affected incorporation cobalt cations silica framework. Diffuse reflectance UV–vis absorption spectra calcined samples hydrogen temperature programmed reduction (H -TPR) demonstrated ions framework locate tetrahedrally coordinated sites. effect (NaOH) addition on improving ion mesostructure discussed.
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