Synthesis and characterization of catalysts based on nickel, cerium, and lanthanum supported on biocarbon for ethanol steam reforming
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
Ethanol steam reforming (ESR) is considered asa promising alternative for hydrogen
production due to some differentadvantages that include the large availability, relatively
low cost, andsuperior reactivity of ethanol as compared to other compounds. Thus,
thistechnology is also considered more sustainable and greener as compared to
othermethods usually employed for hydrogen production. However, the
currentindustrial catalysts suffer from strong deactivation because the extensivecarbon
deposition, which limits their performances and utilization. In order toovercome this
limitation, we report herein the synthesis of a catalyst based onnickel, cerium and
lanthanum supported on activated biocarbon by a microwaveassisted hydrothermal
method. In this method, we first performed a hydrothermalactivation of the biocarbon
support at 120 °C using nitric acid (0.3 M) in areactor coupled to a microwave source
aiming the formation of acid groups atthe surface of our carbonaceous matrix. In a next
step, the adsorption of La3+,Ce3+, and Ni3+ onto the activated biocarbon was
performed by the addition ofLa(NO3)3.6H2O, Ce(NO3)3.6H2O, and Ni(NO3)3.6H2O
in the suspension containingthe activated biocarbon and potassium thiosulfate for
stabilization (pH 8.0) at75 °C. The obtained catalyst was then characterized by
scanning electronmicroscopy, X-ray dispersive spectroscopy, X-ray diffraction,
temperatureprogramed reduction, and surface area by the BET method. After this step,
the catalystwas then evaluated towards the ESR, in which 100 % of ethanol conversion
wasobserved with the formation of only H2 (~ 60%) and CO2 (ESR products) and
COand CH4 as byproducts (both in low concentrations), indicating a goodselectivity
for ESR. Good stability was also achieved with no significant lossof activity even after
24 hours of reaction at 550 °C. The reactants and thereaction products were analyzed
by gas chromatograph (Agilent 7890A), equippedwith a thermal conductivity detector
(TCD) and a flame ionization detector(FID) connected in series.
Como referenciar
FERREIRA, J.C.; CAVALLARI, R.V.; SILVA, F.A. e; RODRIGUES, T.S.; BERGAMASCHI, V.S. Synthesis and characterization of catalysts based on nickel, cerium, and lanthanum supported on biocarbon for ethanol steam reforming. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 6970-6970. Disponível em: http://repositorio.ipen.br/handle/123456789/29619. Acesso em: 14 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.