THERMAL BEHAVIOUR OF AMMONIUM IN THE FRAMEWORK ALUMINOSILICATES AND ITS IMPLICATIONS FOR THE RECYCLING OF NITROGEN
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dc.contributor.author | Likhacheva A.Y. | |
dc.contributor.author | Veniaminov S.A. | |
dc.contributor.author | Paukshtis E.A. | |
dc.date.accessioned | 2022-10-22T08:56:27Z | |
dc.date.available | 2022-10-22T08:56:27Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=31238698 | |
dc.identifier.citation | Lithos, 2004, 73, 1-2 SPEC. ISS., S71 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39011 | |
dc.description.abstract | The thermal decomposition of ammonium-exchanged natural analcime is characterized by gas chromatography, IR spectroscopy and X-ray diffraction. The de-ammoniation and dehydroxylation proceed in parallel throughout the decomposition, which evidences the instability of the protonated analcime framework. The mechanism of degassing of NH 4 -analcime changes throughout its decomposition. At the initial step, the mechanism of de-ammoniation consists in thermal dissociation of NH 4 + molecule onto NH 3 and proton (framework OH group) and diffusion of NH 3 out of the structure. Subsequent decomposition and removal of the OH groups lead to a progressive loss of crystal-linity. At this step, an apparent activation energy for NH 3 desorption is estimated to be 145(±13) kJ mol)1 . This value is within the upper limit of the activation energy characteristic for the NH 3 desorption from proton centres in large-pore zeolites. At the final step, the adsorption of NH 3 and protons onto the defect centres in the amorphosed aluminosilicate framework results in a significant increase of an apparent activation energy for the de-ammoniation and dehydroxylation up to 270(±20) kJ mol)1 . | |
dc.subject | Ammonium analcime | |
dc.subject | De-ammoniation | |
dc.subject | Dehydroxylation | |
dc.subject | Gas chromatography | |
dc.subject | IR spectroscopy | |
dc.title | THERMAL BEHAVIOUR OF AMMONIUM IN THE FRAMEWORK ALUMINOSILICATES AND ITS IMPLICATIONS FOR THE RECYCLING OF NITROGEN | |
dc.type | Статья |
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