Nitrate occlusion studies in Y zeolite and in a clay pillared with aluminium oxide

The occlusion of nitrates is a subject that is important, for instance, in soil amendment, as far as the control of the release of nitrates to the environment is concerned. In this work, the occlusion of molten nitrates was studied in the sodium form of zeolite Y and, to our knowledge, for the first...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2003-03, Vol.58 (2), p.163-173
Main Authors: Carvalho, Ana, Pires, João, Veloso, Patrı́cia, Machado, Manuel, Brotas de Carvalho, M, Rocha, João
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Ion-exchange
Nitrates occlusion
Pillared-clays
Surface physical chemistry
Zeolite Y
Zeolites: preparations and properties
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Summary:The occlusion of nitrates is a subject that is important, for instance, in soil amendment, as far as the control of the release of nitrates to the environment is concerned. In this work, the occlusion of molten nitrates was studied in the sodium form of zeolite Y and, to our knowledge, for the first time, in a pillared clay. The samples were characterized by different techniques, such as low-temperature nitrogen adsorption, X-ray diffraction, differential scanning calorimetry, FTIR, 23Na MAS NMR and 15N MAS NMR. From the different techniques evidence was obtained that supports the existence of occluded nitrates in the studied samples. Both materials, i.e., zeolite Y and the clay from Wyoming pillared with aluminum oxide, seem to have a potential in the release of nitrates for use in soil amendment.
ISSN:1387-1811
1873-3093
DOI:10.1016/S1387-1811(02)00625-X