Pulsed field gradient NMR study of the diffusion of n-hexane confined in hydroxylated and dehydroxylated MCM-41 of various pore diameters

被引：28
作者：
Courivaud, F
Hansen, EW
Karlsson, A
Kolboe, S
Stöcker, M
机构：
[1] Univ Oslo, Dept Chem, N-0315 Oslo, Norway
[2] SINTEF, Appl Chem, N-0314 Oslo, Norway
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2000年 / 35-6卷
关键词：
diffusion; MCM-41; n-hexane; PFG NMR; pore dimension;
D O I：
10.1016/S1387-1811(99)00231-0
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The pore dimension of a reference MCM-41 material was reduced in a controlled manner by successive silylation with tetrachlorosilane. Also, the surface of these materials was modified by temperature treatment, resulting in a reduction of the concentration of surface silanol groups. Pulsed field gradient (PFG) NMR diffusion measurements of n-hexane confined in these modified MCM-41 samples have been performed and the results discussed within the Gaussian phase distribution and short gradient pulse approximations. The observed increase of the mean residence time with increasing diffusion time of the confined n-hexane suggests a distribution of channel lengths to exist. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：327 / 339
页数：13
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