Imidazolium ionic liquids as bifunctional materials (morphology controller and pre-catalyst) for the preparation of xerogel silica's

被引：22

作者：

Migliorini, Marcelo V. ^{[1
]}

Donato, Ricardo K. ^{[1
]}

Benvegnu, Moises A. ^{[1
]}

Goncalves, Reinaldo S. ^{[2
]}

Schrekker, Henri S. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Lab Technol Proc & Catalysis, Inst Chem, BR-91501970 Porto Alegre, RS, Brazil

[2] Univ Fed Rio Grande do Sul, Lab Electrochem, Inst Chem, BR-91501970 Porto Alegre, RS, Brazil

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2008年 / 48卷 / 03期

关键词：

Imidazolium ionic liquid; Xerogel silica; Morphology; Sol-gel; Acid catalyst;

D O I：

10.1007/s10971-008-1820-2

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：

This article describes the preparation of xerogel silica's by the sol-gel technique in the presence of the ionic liquids (ILs) 1-triethylene glycol monomethyl ether-3-methylimidazolium methanesulfonate 1 and 1-monoethylene glycol monomethyl ether-3-methylimidazolium methanesulfonate 2, using tetraethoxysilane as precursor. The addition of water to these ILs resulted in the formation of protonic acid. As a consequence, the ILs functioned as morphology controller and acid pre-catalyst at the same time. Characterization of these materials was performed by photography, scanning electron microscopy, thermogravimetric analysis and powder X-ray diffraction. Compact lamellar monoliths with interlamellar distances of approximately 1.5 nm and flat surfaces were obtained with both ILs.

引用

页码：272 / 276

页数：5

共 31 条

[1] Formation and stability of N-heterocyclic carbenes in water:: The carbon acid pKa of imidazollum cations in aqueous solution [J].