Ordered and hydrothermally stable cubic periodic mesoporous organosilicas with SBA-1 mesostructures: Synthesis, characterization, solid-state NMR spectroscopy, and DFT calculations

Yu Chi Pan, Hao Yiang Wu, Guang Liang Jheng, Hui Hsu Gavin Tsai, Hsien Ming Kao

研究成果: 雜誌貢獻期刊論文同行評審

15 引文 斯高帕斯(Scopus)

摘要

Periodic mesoporous organosilicas (PMOs) based on the cubic SBA-1 mesostructure (Pm3n mesophase) were synthesized by co-condensation of tetraethoxysilane (TEOS) and 1,2-bis(triethoxysilyl)ethane (BTEE) under acidic conditions using cetyltriethylammonium bromide (CTEABr) as a structure-directing agent. The ethanebridged PMO materials thus obtained were characterized by powder X-ray diffraction (XRD), solid-state 13C and 29Si NMR spectroscopy, thermogravimetric analysis (TGA), and nitrogen sorption measurements. The maximum BTEE contents that can be incorporated into the pore wall without degrading the Pm3n mesostructure were up to 60% (based on silica). The resulting materials were hydrothermally stable up to 120 h in boiling water with only a slight decrease in their structural properties, whereas the structure of the pure silica counterpart SBA-1 material was completely collapsed after such treatment. The presence of the ethane groups in the mesoporous wall led to a more hydrophobic environment and thus enhancement of hydrothermal stability, as revealed by water adsorption. The combined results of 2D 29Si{1H} heteronuclear correlation (HETCOR) NMR and density functional theory calculations suggested that the T3-T 2-Q4-Q3 motif could be the favorable framework building unit in PMOs.

原文???core.languages.en_GB???
頁(從 - 到)2690-2698
頁數9
期刊Journal of Physical Chemistry C
113
發行號7
DOIs
出版狀態已出版 - 19 2月 2009

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