Studies on Thermal and Hydrothermal Stability for High-siliceous Molecular Sieve MCM-41

Abstract

Abstract: High-siliceous MCM-41 was calcined at 800℃in dry air and at 600℃ in watersaturated air for different time respectively.Their XRDpatterns and adsorption isotherms of cyclohexane were determined.The results show that the structure of MCM-41 is more stable after calcining at high temperature in dry air. The structures of the samples were damaged by the hydrothermal treatment precalcined at high temperature in dry air for different time with different degrees.The parent MCM-41 was damaged more,but the precalcined samples less.The influence of thermal and hydrothermal treatment on the pore size is not too remarkable.

Key words: High-Siliceous molecular sieve MCM-41, Thermal stability, Hydrothermal stability, Adsorption isotherm of cyclohexane

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DONG Wei-Yang, LONG Ying-Cai, GAO Xiao-Qin, XU Tai-Ming, XIE Guan-Gen, GAO Zi. Studies on Thermal and Hydrothermal Stability for High-siliceous Molecular Sieve MCM-41[J]. Chem. J. Chinese Universities, 1996, 17(12): 1840.

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Studies on Thermal and Hydrothermal Stability for High-siliceous Molecular Sieve MCM-41

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