The unit cell of the gallosilicate mesoporous molecular sieve [Si,Ga]-MCM-41 is significantly smaller than in the purely siliceous [Si]-MCM-41

被引：18

作者：

Cheng, CF

Alba, MD

Klinowski, J

机构：

[1] Department of Chemistry, University of Cambridge, Cambridge CB2 IEW, Lensfield Road

来源：

CHEMICAL PHYSICS LETTERS | 1996年 / 250卷 / 3-4期

关键词：

D O I：

10.1016/0009-2614(96)00025-5

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 unit cell parameter of [Si, Ga]-MCM-41 is much smaller than that of [Si]-MCM-41, its purely siliceous counterpart, and decreases with the increased content of structural gallium. The thickness of the channel wall falls linearly with the decreased fraction of S-4 at the Q(4) sites. The channel diameter is also affected. The effect, which can be used for 'fine tuning' of the porosity, is caused by the more difficult condensation of gallosilicate polyanions in comparison with silicate polyanions. Samples with higher gallium contents have a broader distribution of pore sizes.

引用

页码：328 / 334

页数：7

共 26 条

[1] HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPY OF MESOPOROUS MCM-41 TYPE MATERIALS [J].