Título: | CATALYSTS SUPPORTED IN MICRO AND MESOPOROUS MOLECULAR SIEVES FOR THE FISCHER- TROPSCH SYNTHESIS | ||||||||||||||||||||||||||||||||||||||||
Autor: |
JAQUELINE FARIAS DA SILVA |
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Colaborador(es): |
MARIA ISABEL PAIS DA SILVA - Orientador |
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Catalogação: | 06/ABR/2005 | 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=6221&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=6221&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.6221 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
The Fischer- Tropsch synthesis converts the synthesis gas
(H2 + CO), in a
complex variety of hydrocarbons, using a catalyst (Co/Al2O3
normally) were
introduced to the used supports by the wetness incipient
impregnation.
The samples were analyzed by several techniques such as:
plasma- emission
spectrometry (ICP- EAS), N2 physical adsorption by BET
method, X-ray
diffraction (XRD), temperature programmed reduction (TPR),
transmission
electronic microscopy (TEM), hydrogen chemisorption and
Infrared Spectroscopy
of adsorbed pyridine. The catalysts were evaluated using a
fixed bed reactor in the
Fischer-Tropsch synthesis. For the iron samples, with the
same metal content and
different supports, it was observed that the MCM-41 sample
presented the lowest
reduction level. Among the iron samples supported in KL
zeolite, the 5% Fe/KL
sample presented the largest reduction level. It was
observed by transmission
electronic microscopy that the iron particles diameter
measured around 6 nm.
For the cobalt samples, it was observed that the reduction
temperature of the
MCM-41 supported was the highest one. The 5% Co/KL sample
presented the
largest reduction level. It was observed by TEM that the
cobalt particles presented
diameters in the range from 8 to 20 nm. It was verified
that the catalyst with the
largest iron percentage promoved the highest CO conversion.
The products
distribuition was shifted to light fractions. It was
observed similar conversions to
iron catalysts supported in the KL zeolite and in the MCM-
41 mesoporous
molecular sieve. The iron catalysts were more active than
the cobalt ones in the
CO conversion, but tha cobalt catalysts promoted a higher
content of diesel
fraction and lesser light fractions.
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