Desenvolvimento de material BaCexPr1-xO3 (0 ≤ X ≤ 1) com estrutura perovskita para oxidação catalítica do CO a CO2 em reator de leito fixo
Barium Cerate (BaCeO3) is perovskite type structure of ABO3, wherein A and B are metal cations. These materials, or doped, have been studied by having characteristics that make them promising for the application in fuel cells solid oxide, hydrogen and oxygen permeation, as catalysts, etc .. Howev...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20229 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | Barium Cerate (BaCeO3) is perovskite type structure of ABO3, wherein A and B are metal
cations. These materials, or doped, have been studied by having characteristics that make them
promising for the application in fuel cells solid oxide, hydrogen and oxygen permeation, as
catalysts, etc .. However, as the ceramic materials mixed conductivity have been produced by
different synthesis methods, some conditions directly influence the final properties, one of the
most important doping Site B, which may have direct influence on the crystallite size, which in
turn directly influences their catalytic activity. In this study, perovskite-type (BaCexO3) had
cerium gradually replaced by praseodymium to obtain ternary type materials BaCexPr1-xO3 and
BaPrO3 binaries. These materials were synthesized by EDTA/Citrate complexing method and
the material characterized via XRD, SEM and BET for the identification of their structure,
morphology and surface area. Moreover were performed on all materials, catalytic test in a
fixed bed reactor for the identification of that person responsible for complete conversion of
CO to CO2 at low operating temperature, which step can be used as the subsequent production
of synthesis gas (CO + H2) from methane oxidation. In the present work the crystalline phase
having the orthorhombic structure was obtained for all compositions, with a morphology
consisting of agglomerated particles being more pronounced with increasing praseodymium in
the crystal structure. The average crystal size was between 100 nm and 142,2 nm. The surface
areas were 2,62 m²g-1
for the BaCeO3 composition, 3,03 m²g-1
to BaCe0,5Pr0,5O3 composition
and 2,37 m²g-1
to BaPrO3 composition. Regarding the catalytic tests, we can conclude that the
optimal flow reactor operation was 50 ml / min and the composition regarding the maximum
rate of conversion to the lowest temperature was BaCeO3 to 400° C. Meanwhile, there was
found that the partially replaced by praseodymium, cerium, there was a decrease in the catalytic
activity of the material. |
|---|