Irreversible change of pore structure of MCM-41 upon hydration at room temperature

被引：83

作者：

Zhao, XS

Audsley, F

Lu, GQ ^{[1
]}

机构：

[1] Univ Queensland, Dept Chem Engn, St Lucia, Qld 4072, Australia

[2] Univ Queensland, Dept Earth Sci, St Lucia, Qld 4072, Australia

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 21期

关键词：

D O I：

10.1021/jp9806664

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 pore structure stability of MCM-41 materials upon hydration/dehydration was studied by XRD, Si-29 MAS NMR, and gravimetric adsorption techniques. Results demonstrated that collapses of the pore structure of MCM-41 occurred upon rehydration at room temperature due to the hydrolysis of the bare Si-O-Si(Al) bonds in the presence of water vapor. Full structure collapses of MCM-41 were found to occur when a MCM-41 sample was left in air for three months. It is also suggested that care must be taken when XRD is used to evaluate the structure property of MCM-41 materials to avoid the possible adverse effects of water vapor.

引用

页码：4143 / 4146

页数：4

共 13 条

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