Hydrolysis and Structural Disintegration of MCM-41 Molecular Sieves

Abstract

Abstract: Hydrolysis and structural disintegration of SiMCM-41,AlMCM-41 and HAlMCM-41 under different conditions have been investigated. Pure SiMCM-41 exhibits a high thermal stability and hydrothermal stability when calcined in air and steam for a short period. Structural disintegration of SiMCM-41 has been observed after being exposed to moist air for 3 months, because the surface Si-O-Si bonds are split by hydrolysis forming hydrated silicic acid molecules. AlMCM-41 is more resistant to hydrolysis than SiMCM-41, but its high temperature stability in air and steam is limited by the presence of Na⁺ in its structure. HAlMCM-41 is more stable than AlMCM-41 during heat treatment. Salt effect during hydrothermal crystallization process has been proved to be the cause for the improvement of the stability of AlMCM-41 and HAlMCM-41 in moist air and hotwater. Hence, adding salt to the reaction mixture during hydrothermal crystallization can lead to a significant improvement of the water resistan.

Key words: MCM-41, Hydrolysis, Stability, Salt effectce and stability of MCM-41 molecular sieves.

CLC Number:

O641.3

TrendMD:

LI Hui-Yun, SUN Yu, YUE Ying-Hong, GAO Zi . Hydrolysis and Structural Disintegration of MCM-41 Molecular Sieves[J]. Chem. J. Chinese Universities, 1999, 20(2): 272.

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Hydrolysis and Structural Disintegration of MCM-41 Molecular Sieves

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