Title Coupling catalysis and electrocatalysis for hydrogen production in a solid electrolyte membrane reactor
Authors de Lucas-Consuegra, A. , Gutierrez-Guerra, N. , Caravaca, A. , SERRANO RUIZ, JUAN CARLOS, Valverde, J. L.
External publication Si
Means Appl. Catal. A-Gen.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.94200
SJR Impact 1.33500
Publication date 05/08/2014
ISI 000341482800004
DOI 10.1016/j.apcata.2014.06.025
Abstract This study reports the production of H-2 via catalytic methane decomposition on Pt supported on yttria-stabilized zirconia together with its electrochemical regeneration in a solid electrolyte membrane reactor. Hence, a Pt-YSZ(porous)/YSZ/Pt double-chamber solid electrolyte cell was prepared and tested under two reaction regimes. In the first regime, under open-circuit conditions, hydrogen and carbon are produced on the catalytically active Pt-YSZ porous catalyst via methane decomposition reaction (CH4 (g) -> C (s) + 2H(2) (g)). In the second regime, under polarization conditions, steam is electrolyzed at the Pt cathode of the cell (H2O +2e(-) -> H-2 + O2-) and the produced O2- ions were simultaneously electrochemically pumped to the Pt/YSZ porous catalyst (anode), thereby allowing removal of the previously deposited carbon (C (s) + O2- -> CO2 (g)) and finally regenerating the Pt/YSZ porous catalyst film. We demonstrated that the carbon generated in the methane decomposition step serves as a depolarizating agent in the steam electrolysis process, thus decreasing the electrical energy input required for electrochemically producing pure H-2. In addition, during the regeneration step, C-2 hydrocarbons (e.g., ethane and ethylene) were obtained as a result of the electrocatalytic methane oxidative coupling on the Pt/YSZ porous catalyst film. The performance and durability of the system was also verified for long operation times in view of the possible practical application of this novel reactor configuration, which combines gas-phase catalysis and electrocatalysis for hydrogen production. (C) 2014 Elsevier B.V. All rights reserved.
Keywords H-2 production; Methane decomposition; Steam electrolysis; Solid electrolyte membrane reactor; Electrochemical regeneration
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