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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Usachev, N.Y., Belanova, E.P., Krukovsky, I.M. et al. Thermal transformations in systems based on zeolites Y, X, and A containing zinc and sodium nitrates. Russian Chemical Bulletin 52, 1940–1949 (2003). https://doi.org/10.1023/B:RUCB.0000009636.89718.56
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DOI: https://doi.org/10.1023/B:RUCB.0000009636.89718.56