Synthesis of Co-Ni and Cu-Ni based-catalysts for dry reforming of methane as potential components for SOFC anodes
authors Cesario, MR; Souza, GS; Loureiro, FJA; Araujo, AJM; Grilo, JPF; Aouad, S; Tidahy, HL; Macedo, DA; Fagg, DP; Gennequin, C; Abi-Aad, E
nationality International
journal CERAMICS INTERNATIONAL
author keywords One-step synthesis; Cermet anode; Solid oxide fuel cell (SOFC); Gadolinia-doped ceria (CGO); Nickel alloy
keywords OXIDE FUEL-CELLS; MG-AL CATALYSTS; SYNGAS PRODUCTION; CARBON-DIOXIDE; BIMETALLIC CATALYSTS; NICKEL; BIOGAS; TEMPERATURE; CH4; PERFORMANCE
abstract In this work, we report a comparative study of Ni-based anode compositions, made of Cu and Co (40 and 80 mol %) and gadolinia-doped ceria (CGO) matrices, for application the dry reforming of methane (DRM) reaction using Solid Oxide Fuel Cells (SOFCs). The new compositions are synthesized by a one-step synthesis route, using citric acid as chelating agent, and characterized at three different stages: i) after synthesis, ii) after reduction, and iii) after DRM. X-ray diffraction (XRD) analysis combined with thermodynamic calculations is used to understand phase evolution along the different stages, revealing that complete solid solutions of NiCo- and NiCu-based alloys are formed after DRM reaction. Transmission Electron Microscopy (TEM) shows the formation of nanocrystalline powders, while surface area (SBET) measurements show higher values in the case of the NiCo-based samples. Moreover, the Co-containing compositions exhibit higher reducibility and stronger metal-ceramic interactions than the Cu-containing samples, according to the Temperature Programmed Reduction (TPR) results. Finally, DRM results demonstrate higher CO2 and CH4 conversions in the case of the Co-containing samples, as well as increased resistance towards carbon deposition, as confirmed by Thermogravimetric and Differential Scanning Calorimetry analyses (TG-DSC). Overall, the Co-based compositions are highly beneficial for their use as anodes for the CO2 reforming of methane in SOFCs.
publisher ELSEVIER SCI LTD
issn 0272-8842
isbn 1873-3956
year published 2021
volume 47
issue 23
beginning page 33191
ending page 33201
digital object identifier (doi) 10.1016/j.ceramint.2021.08.220
web of science category 11
subject category Materials Science, Ceramics
unique article identifier WOS:000708545600004
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