Synthesis of [Si]-MCM-41 from TEOS and water glass: the water glass-enhanced condensation of TEOS under alkaline conditions

被引:15
作者
Mokhonoana, M. P. [1 ,2 ]
Coville, N. J. [1 ]
机构
[1] Univ Witwatersrand, Sch Chem, Inst Mol Sci, ZA-2050 Wits, Johannesburg, South Africa
[2] Univ Limpopo, Dept Chem, ZA-0727 Sovenga, Polokwane, South Africa
基金
新加坡国家研究基金会;
关键词
Si]-MCM-41; Hydrothermal synthesis; Sol-gel synthesis; Water glass; TEOS; MESOPOROUS MOLECULAR-SIEVES; ROOM-TEMPERATURE SYNTHESIS; LARGE CRYSTAL MCM-41; HYDROTHERMAL STABILITY; SILICA MATERIALS; DRUG-DELIVERY; PORE-SIZE; MORPHOLOGY; FUNCTIONALIZATION; IMPROVEMENT;
D O I
10.1007/s10971-010-2161-5
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Mesoporous [Si]-MCM-41 molecular sieve systems have been fabricated by aging silica gels in CTAB both at RT and under hydrothermal conditions with or without stirring. For the synthesis involving water glass as a SiO(2) source, optimal conditions (100 A degrees C, pH 10, crystallization time 2-3 days) gave reproducible, highly ordered [Si]-MCM-41 materials in multi gram scale with high lattice parameter values and BET surface areas. The synthesis with TEOS as silica source produced an inferior quality material. A novel synthesis route involving the use of mixtures of the two precursors gave [Si]-MCM-41 with improved structural (XRD) and microstructural (HRTEM) long-range order. Addition of small amounts of water glass to a TEOS-based synthesis gel under stirred conditions produced [Si]-MCM-41 with excellent mesoporosity, long-range microstructural order, XRD and S (BET) properties. These properties are reminiscent of those for materials obtained from water glass as a sole SiO(2) source. The advantage of this route is that it gave high-quality materials at relatively lower temperatures (80 A degrees C) and shorter crystallization times (6 h) after 21 h aging at RT. The variation of the XRD d (100) peak position, BET and HRTEM properties with [TEOS]/[water glass] ratio revealed that a ratio = 3.95 gave optimal production of the highly ordered materials. The data suggests that water glass acts as a structure-directing agent for the TEOS and is incorporated into the final structure.
引用
收藏
页码:83 / 92
页数:10
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