Stability of MCM-48 in aqueous solution as a function of pH

被引：34

作者：

Doyle, A

Hodnett, BK ^{[1
]}

机构：

[1] Univ Limerick, Mat & Surface Sci Inst, Limerick, Ireland

[2] Univ Limerick, Dept Chem & Environm Sci, Limerick, Ireland

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2003年 / 63卷 / 1-3期

关键词：

mesoporous; MCM-48; aqueous stability; pH;

D O I：

10.1016/S1387-1811(03)00431-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The stability of MCM-48 was investigated as a function of pH. The material was treated with aqueous solutions of varying pH and the stability was determined by comparison with the untreated MCM-48. In acidic conditions of pH < 5.4, the MCM-48 structure was stable and the BET surface area remained high (>1000 m(2) g(-1)), while the mean pore diameter decreased by approximately 20%. In neutral conditions, this phase was completely removed, characterised by the absence of an X-ray diffraction pattern and a dramatic reduction in surface area to 450 m(2) g(-1) at pH 6.9. Treatment at pH 9.1 caused a transformation to a poorly ordered material, while further increased basic conditions caused significant structural collapse. (C) 2003 Elsevier Inc. All rights reserved.

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页码：53 / 57

页数：5

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