Synthesis and solid-state NMR characterization of cubic mesoporous silica SBA-1 functionalized with sulfonic acid groups

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题名:	Synthesis and solid-state NMR characterization of cubic mesoporous silica SBA-1 functionalized with sulfonic acid groups
作者:	Tsai,HHG;Chiu,PJ;Jheng,GL;Ting,CC;Pan,YC;Kao,HM
贡献者:	化學學系
关键词:	CATALYTIC-ACTIVITY;HETEROGENEOUS CATALYSTS;SELECTIVE SYNTHESIS;BENZENE-SILICA;WALL STRUCTURE;THIOL-GROUPS;MAS NMR;ESTERIFICATION;DENSITY;MONOGLYCERIDES
日期:	2011
上传时间:	2012-03-27 18:13:18 (UTC+8)
出版者:	國立中央大學
摘要:	Well-ordered cubic mesoporous silicas SBA-1 functionalized with sulfonic acid groups have been synthesized through in situ oxidation of mercaptopropyl groups with H(2)O(2) via co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) templated by cetyltriethylammonium bromide (CTEABr) under strong acidic conditions. Various synthesis parameters such as the amounts of H(2)O(2) and MPTMS on the structural ordering of the resultant materials were systematically investigated. The materials thus obtained were characterized by a variety of techniques including powder X-ray diffraction (XRD), multinuclear solid-state Nuclear Magnetic Resonance (NMR) spectroscopy, (29)Si{(1)H} 2D HETCOR (heteronuclear correlation) NMR spectroscopy, thermogravimetric analysis (TGA), and nitrogen sorption measurements. By using (13)C CPMAS NMR technique, the status of the incorporated thiol groups and their transformation to sulfonic acid groups can be monitored and, as an extension, to define the optimum conditions to be used for the oxidation reaction to be quantitative. In particular, (29)Si{(1)H} 2D HETCOR NMR revealed that the protons in sulfonic acid groups are in close proximity to the silanol Q(3) species, but not close enough to form a hydrogen bond. (C) 2011 Elsevier Inc. All rights reserved.
關聯:	JOURNAL OF COLLOID AND INTERFACE SCIENCE
显示于类别:	[化學學系] 期刊論文

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