Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
An alternative method for the introduction of aluminum into the STW zeolitic framework is presented. HPM-1, a chiral STW zeolite with helical pores, was synthesized in the pure silica form, and an aluminum source was added by in situ generated seeds. Displacements of the peak positions in the Al...
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| Principais autores: | , , , , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
MDPI
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/29583 |
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| Resumo: | An alternative method for the introduction of aluminum into the STW zeolitic framework
is presented. HPM-1, a chiral STW zeolite with helical pores, was synthesized in the pure silica form,
and an aluminum source was added by in situ generated seeds. Displacements of the peak positions
in the Al samples were found in the X-ray diffractograms, indicating the possible incorporation of
the heteroatom into the framework. Using an analysis of the 29Si and 27Al magic-angle spinning
nuclear magnetic resonance (MAS NMR) spectra, we concluded that the aluminum was effectively
introduced into the framework. The (AlTETRAHEDRAL/AlOCTAHEDRAL) ratio and its textural properties
were studied to explain the catalytic ethanol conversion results at medium temperatures. The sample
with the lowest Si/Al ratio showed the best results due to its higher surface area and pore volume,
in comparison to those observed for the sample with the highest Si/Al ratio, and due to its higher bulk
tetrahedral aluminum content, in comparison to the intermediate Si/Al ratio sample. All catalysts
were selective to ethylene and diethyl ether, confirming the presence of acidic sites |
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