Preparation and characterization of microporous SiO2–ZrO2 pillared montmorillonite
Preparation and characterization of microporous SiO2–ZrO2 pillared montmorillonite
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DOI：
10.1016/j.jssc.2006.01.013
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发表时间：
2006-04
影响因子：
3.3
通讯作者：
Yang-Su Han;S. Yamanaka
中科院分区：
文献类型：
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作者：
Yang-Su Han;S. Yamanaka
采用溶胶-凝胶法制备SiO2-ZrO 2柱撑蒙脱石（SZM）。胶体柱撑使蒙脱石层间距扩大到约100 nm。煅烧后的SZM样品在400°C时比表面积高达320 m2/g。尽管大的层间分离，吸附结果表明，在胶体颗粒之间产生的微孔的存在下。微孔结构保持至少高达600°C，并表现出特定的形状选择性的大有机分子的吸附，特别是在甲苯和均三甲苯之间。根据氨的程序升温脱附（TPD）谱，煅烧后的SZM显示出弱酸性中心。
SiO2–ZrO2pillared montmorillonite (SZM) was prepared by the reaction of Na-montmorillonite with colloidal silica–zirconia particles which were prepared by depositing zirconium hydroxy cations on silica particles. By pillaring with the colloidal particles, the basal spacing of montmorillonite was expanded to ca. 45Å and the calcined SZM samples showed large specific surface areas up to 320m2/g at 400°C. In spite of large interlayer separation, adsorption results indicated the presence of micropores generated between the colloidal particles. The microporous structure was maintained at least up to 600°C and exhibited specific shape selectivity for the adsorption of large organic molecules, especially between toluene and mesitylene. According to the temperature-programmed-desorption (TPD) spectra of ammonia, the calcined SZM showed weakly acidic sites.