Título: | THE STUDY OF METAL-SUPPORT INTERACTION ON BARIUM AND CESIUM PROMOTED RUTHENIUM CATALYSTS FOR THE AMMONIA SYNTHESIS | |||||||
Autor: |
MONICA PIRES NERY |
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Colaborador(es): |
MARIA ISABEL PAIS DA SILVA - Orientador |
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Catalogação: | 24/JUN/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=6629&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=6629&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.6629 | |||||||
Resumo: | ||||||||
The industrial ammonia synthesis process uses a triple
promoted iron catalyst,
operating at drastic temperature conditions between 673K
and 973K, and high
pressure (300atm). New catalysts have been studied,
replacing iron, to increase
NH3 production. The main advantage of Ru-based catalysts
is that they are less
sensitive to poisoning by ammonia than Fe-based catalysts.
The aim of this work
was to evaluate ruthenium catalysts supported on zeolites
and hydrotalcite
promoted by basic cations for ammonia synthesis reaction.
The influence of the
support type on the ruthenium catalysts and of
introduction way of the ruthenium
precursors was verified. Also the hole of the cationic
promoters (Ba and Cs) on
the metal-support interaction and on the ruthenium
catalysts activity in the
ammonia synthesis reaction was examined. The ruthenium
catalysts supported on
hydrotalcite had the highest conversion in the ammonia
synthesis reaction. They
presented the highest degrees of dispersion and reduction
of metallic particles.
The barium, despite having decreased the interaction
between the ruthenium and
the support, showed to be a more effective promoter on the
synthesis of ammonia
than the cesium. The barium introduction order resulted in
different effects over
the ruthenium catalysts performance depending on the
support. The impregnation
method with ruthenium carbonil was the most effective,
leading to more basic
ruthenium catalysts and more actives in the ammonia
synthesis reaction.
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