Crystallization and Spontaneous Phase Transformation of MTN-Type Zeolite with Tetragonal Symmetry |
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| Authors: | Maoying SongXiqing Wang Weizheng ZhouHeyong He Yaojun SunTailiu Wu Yingcai Long |
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| Institution: | a Department of Chemistry, Fudan University, Shanghai, 200433, Chinab Center of Analysis and Measurement, Fudan University, Shanghai, 200433, China |
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| Abstract: | MTN-type zeolite with tetragonal symmetry was hydrothermally synthesized in a reactant system of Na2O-SiO2-NaF-H2O using N-ethyl-hexamethylenetetraammonium bromide as the template. A spontaneous phase transformation of the as-synthesized zeolite at ambient temperature from tetragonal to cubic symmetry was investigated with polarized light microscopy, X-ray powder diffraction, 29Si magic angle spinning nuclear magnetic resonance, and differential scanning calorimetry. The results of the investigations indicate that the as-synthesized tetragonal MTN zeolite is a metastable phase. |
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| Keywords: | MTN zeolite spontaneous phase transformation N-ethyl-hexamethylenetetraammonium bromide |
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