Hydrothermal synthesis of MCM-41 using different ratios of colloidal and soluble silica

被引：29
作者：
Amama, PB [1 ]
Lim, S [1 ]
Ciuparu, D [1 ]
Pfefferle, L [1 ]
Haller, GL [1 ]
机构：
[1] Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2005年 / 81卷 / 1-3期
关键词：
MCM-41; hydrothermal synthesis; silica source; physicochemical properties; structural integrity;
D O I：
10.1016/j.micromeso.2005.02.001
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The influence of different ratios of colloidal (Cab-O-Sil, HiSil-915 and sodium silicate) and soluble (tetramethylammonium silicate) silica on the physicochemical properties (surface area, porosity, degree of structural order, thermal stability, density of free silanol group) of MCM-41 has been investigated. MCM-41 materials synthesized hydrothermally have been characterized by XRD, N-2 physisorption, and IR spectroscopy. The results show that colloidal silica (HiSil-915 or Cab-O-Sil) to soluble silica ratio corresponding to 80:20 favors the formation of MCM-41 material with higher degree of structural order and uniformity of mesopores than those synthesized from the conventional ratios (similar to 70:30). Also, a new approach for tailoring the pore diameter within a modest range (similar to 20-30 angstrom) and controlling the other properties (surface area, porosity, and pore wall thickness) of MCM-41 has been demonstrated in this study. MCM-41 materials synthesized from Cab-O-Sil have thicker pore walls (15-20 angstrom) and show better thermal stability than when HiSil-915 is used. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码：191 / 200
页数：10
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