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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| Institution: | (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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