Abstract
Occluded salts in the form of salt complexes exhibit the interesting properties unattainable in bulk state. In this study, occlusion of non-nitrate salts and co-occlusion of mixed nitrate salts were attempted to further expand occlusion potential of zeolites. The non-nitrate salts such as KClO3 and KH2PO4 were occluded by mordenite, although they do not establish stable molten state. Their occlusions were confirmed by 27Al NMR spectra, N2 adsorption/desorption isotherms and thermal analyses. The occluded amounts were relatively less compared to those of nitrate salts. On the other hand, thermal treatment of Na-P1 with a mixture of NH4NO3 and KNO3 resulted in co-occlusion of both NH4NO3 and KNO3 by Na-P1 below the melting temperature of KNO3. The salts in solid state could be introduced into and occluded by zeolites through the interaction with the molten salt present in the salt mixture. The use of salt mixture could lead to co-occlusion of the salts that could be hardly applicable to salt occlusion. Therefore, this study clearly shows that a variety of salts could be applied to salt occlusion by zeolites.
Original language | English |
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Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Microporous and Mesoporous Materials |
Volume | 62 |
Issue number | 1-2 |
DOIs | |
State | Published - 1 Aug 2003 |
Keywords
- Mixed salts
- Non-nitrate salts
- Salt occlusion
- Slow-release agents