SURFACE CHARACTERIZATION BY FT-IR SPECTROSCOPY OF AN AEROGEL PRECURSOR TO CORDIERITE

被引:14
作者
BARATON, MI
MERLEMEJEAN, T
QUINTARD, P
LORENZELLI, V
机构
[1] FAC SCI LIMOGES,SPECTROMETRIE VIBRAT LAB,CNRS,URA 320,123 AVE A THOMAS,F-87060 LIMOGES,FRANCE
[2] FAC INGN GENOVA,IST CHIM,I-16129 GENOA,ITALY
关键词
D O I
10.1021/j100378a059
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The surface of an aerogel precursor to cordierite synthesized through a sol-gel process has been investigated by transmission/absorption Fourier-transform infrared spectroscopy. The surface sites have been probed by adsorption of several molecules (CO2, CH3OH, CH3CN, and pyridine). Our results have pointed out on the surface the existence of both hydroxyl groups bonded to silicon atoms and Al3+ Lewis acid sites as on pure alumina. No presence of Mg atoms or O2- basic sites has been detected. This aerogel appears therefore to have an essentially acidic surface. Both surface structure and acidic behavior of our aerogel precursor agree with those corresponding to the crystalline cordierite into which this aerogel is transformed by heating. © 1990 American Chemical Society.
引用
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页码:5930 / 5934
页数:5
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