Thermal transformations in systems based on zeolites Y,X, and A containing zinc and sodium nitrates |
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Authors: | Usachev,N. Ya.,Belanova,E. P.,Krukovsky,I. M.,Kanaev,S. A.,Atal" yan,O. K.,Kazakov,A. V. |
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Affiliation: | (1) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation |
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Abstract: | Thermal transformations in systems formed by interaction of Zn and Na nitrates with Y, X, and A zeolites were studied by TG—DTA technique. Temperature regions of existence of adsorbed water, water of crystallization, and decomposition of NO3– anion were determined. These intervals depend on the composition, structure, method of preparation, and pre-treatment conditions of zeolite systems. The extent of NO3– decomposition depends not only on the zinc and sodium content but also on the presence of ammonia involved in NO3– reduction. The zeolite matrix strongly stabilizes the occluded NO3– anions. A portion of zinc oxide formed by zinc nitrate decomposition is probably localized inside the zeolite cavities as the [Zn—O—(ZnO)n—Zn]2+ particles. The latter compensate charges of the isolated [AlO4]– tetrahedra. |
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Keywords: | zeolites sodium nitrate zinc nitrate ion exchange thermal transformations TG— DTA method |
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