Título: | SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE MORDENITE, FERRIERITE AND ZSM-5 ZEOLITES | ||||||||||||||||||||||||||||||||||||||||
Autor: |
SONIA LETICHEVSKY |
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Colaborador(es): |
MARIA ISABEL PAIS DA SILVA - Orientador JOAQUIN PEREZ PARIENTE - Coorientador |
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Catalogação: | 09/SET/2008 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=12172&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=12172&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.12172 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
In this work, the mordenite, ferrierite and ZSM-5 zeolites
were prepared by
hydrothermal synthesis, modifying the parameters aluminium
and silicium
sources, water content, seeding, crystallization time and
temperature. The
objective was to obtain nanocrystalline zeolites. The
prepared samples were
characterized by atomic absorption spectrophotometry, X-ray
diffraction with
Rietveld refinement, N2 physical adsorption, atomic force
microscopy, scanning
electronic microscopy, transmission electronic microscopy
and 27Al and 29Si solid
state nuclear magnetic resonance. To achieve crystal size
control it was important
to find the equilibrium between synthesis time and
temperature. Sodium
aluminate was found to be the most suitable aluminium
source. As for the silicium
source, each zeolite type had a more suitable source.
Mordenite samples with
crystallite size between 56 and 292 nm and different
crystallinity percentages
were obtained. Ferrierite samples with crystallite size
between 61 and 82 nm were
obtained. Two ZSM-5 samples with crystallite size of 46 nm
and 58 nm were
prepared. This study showed that to obtain an efficient
crystal size control, it is
necessary to have a deep knowledge of the influence of all
individual parameters
in each zeolite`s crystallization process. Finally, it was
possible to propose a
crystallization mechanism to each zeolite studied.
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