Direct Alkaline Anion Exchange Membrane Fuel Cell to converting methane into methanol
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2019
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Resumo
Methane is the main constituent of natural gas and can be
converted in higher value-added products for electricity
cogeneration. It could be used as a solid membrane reactor
(SMR) for application in Alkaline Anion-Exchange Membrane
Fuel Cell (AAEMFC). The investigation for the conversion of
methane was based on sodium borohydride (NaBH4) method
using Pt/C Basf, Pd/C, Ni/C as catalysts. The electrocatalysts
were prepared with 20 wt% of metals loading on carbon. The
X-ray diffraction (XRD) analysis revealed a face-centered cubic
structure (FCC) for Pt/C and Pd/C catalysts, was observed Ni/
NiO phases for Ni/C electrocatalyst. The Transmission Electron
Microscopy (TEM) exhibited a good dispersion of nanoparticles
and some agglomerations on the support, with a mean size of
6.4 nm for Pd/C, 5.7 nm for Ni/C and near to 2 nm size for Pt/C.
The experiments with AAEMFC showed that all materials can
carry out the reaction spontaneously. Pt/C catalyst presents
energy density higher than the other materials. FTIR data
suggest that methane was converted into small products
organic molecules such as methanol and formate in different
potentials for Pt/C, Pd/C, and Ni/C. The products were
quantified by Raman spectroscopy. The high conversion
efficiency obtained was about 20% at 0.3 V using Pt/C catalyst,
the maximum conversion over Pd/C was 17.5% at 0.15 V,
associated with the formation of a thin layer of PdO on the
catalytic surface. The highest conversion rate (13%) was
observed in closed circuit potentials to the short circuit in the
cell with Ni/C catalyst. The results suggest that for the selective
conversion of methane to methanol are most promising using
materials containing Pt or Pd.
Como referenciar
SANTOS, MONIQUE C.L.; NUNES, LIVIA C.; SILVA, LUIS M.G.; RAMOS, ANDREZZA S.; FONSECA, FABIO C.; SOUZA, RODRIGO F.B. de; NETO, ALMIR O. Direct Alkaline Anion Exchange Membrane Fuel Cell to converting methane into methanol. ChemistrySelect, v. 4, n. 39, p. 11430-11434, 2019. DOI: 10.1002/slct.201902421. Disponível em: http://repositorio.ipen.br/handle/123456789/30407. Acesso em: 06 Jun 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.