Mesostructured SBA-16 with excellent hydrothermal, thermal and mechanical stabilities: modified synthesis and its catalytic application.
Mesostructured SBA-16 with excellent hydrothermal, thermal and mechanical stabilities: modified synthesis and its catalytic application.
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DOI：
10.1016/j.jcis.2009.01.071
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发表时间：
2009-05
影响因子：
9.9
通讯作者：
Hui Sun;Qinghu Tang;Yu Du;Xianbin Liu;Yuan Chen;Yanhui Yang
中科院分区：
文献类型：
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作者：
Hui Sun;Qinghu Tang;Yu Du;Xianbin Liu;Yuan Chen;Yanhui Yang
以嵌段共聚物聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（F127）为模板剂，十六烷基三甲基溴化铵（CTAB）为共模板剂，正硅酸乙酯（TEOS）为硅源，在水热条件下合成了SBA-16介孔SiO2。采用X射线衍射（XRD）、氮气物理吸附、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和29 Si固体核磁共振（NMR）等手段对SBA-16白炭黑的物化性能进行了表征。合成的SBA-16具有高度有序的介孔结构、单分散的球形形貌、优异的水热稳定性、热稳定性和机械稳定性。值得一提的是，合成时间从48 h大幅缩短至8 h，为大规模制备SBA-16白炭黑开辟了一条可行的途径。此外，SBA-16的“超笼”孔结构以“瓶中船”的方式包裹了金纳米粒子。在无溶剂条件下，金纳米粒子（平均粒径为5 nm）在分子氧选择氧化苯甲醇反应中表现出很高的催化活性。
We report a modified method to synthesize SBA-16 mesostructured silica under refluxing condition using block co-polymer poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (F127) as template, cetyltrimethylammonium bromide (CTAB) as co-template, and tetraethyl orthosilicate (TEOS) as silica source. The physiochemical properties of SBA-16 silica were characterized by X-ray diffraction (XRD), nitrogen physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and29Si solid-state nuclear magnetic resonance (NMR). The resulting SBA-16 silica exhibited highly ordered mesoporous structure, mono-dispersed spherical morphology, excellent hydrothermal, thermal and mechanical stabilities. It was worth mentioning that the synthesis time can be significantly reduced from 48 h to 8 h, which opened a feasible way to produce SBA-16 silica in a large scale. Moreover, the “super-cage” pore structure of SBA-16 encapsulated gold nanoparticles in a “ship in a bottle” way. The well-confined gold nanoparticles (mean size of 5 nm) with a narrow particle size distribution were highly active in solvent-free benzyl alcohol selective oxidation with molecular oxygen.