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Catalyst evaluation for high-purity H2 production by sorption-enhanced steam-methane reforming coupled to a Ca/Cu process

AutorNavarro López, María Victoria ; López Sebastián, José Manuel ; García Martínez, Tomás ; Grasa Adiego, Gemma ; Murillo Villuendas, Ramón
Palabras claveH2 production
Sorption-enhanced reforming
Steam-methane reforming
Combined calcium-copper cycle
Fecha de publicación27-jul-2017
EditorElsevier
CitaciónJournal of Power Sources 363: 117-125 (2017)
ResumenThe operational limits of a commercial nickel-based catalyst under the conditions of a sorption-enhanced steam-methane reforming process coupled to a Ca/Cu chemical loop are investigated for high-purity H2 production in a cyclic operation. The performance of the reforming catalyst is tested by means of a high number of oxidation-reduction-reforming cycles. After 100 oxidation-reduction cycles, this catalyst retains its exceptional reforming activity. The methane conversion values are close to the thermodynamic equilibrium under very demanding conditions: temperature between 500 ºC - 700 ºC and mass hourly space velocity of 8.8 kgCH4 h-1 kgcat-1. After 200 cycles, the sample shows reduction in its reforming activity in line with a lower dispersion of the Ni species. Sintering of Ni nanocrystals is evidenced during the oxidation-reduction multi-cycles. The performance of the catalyst after 200 oxidation-reduction cycles mixed with a CaO-based CO2 sorbent is studied under optimal conditions calculated for the sorption-enhanced reforming process coupled to a Ca/Cu cycle (temperature of 650 ºC, steam/methane ratio of 4, sorbent/catalyst ratio of 4 and space velocity of 0.75 kgCH4 h-1 kgcat-1). Remarkably, an equilibrium value over 92 vol.% H2 concentration is achieved, highlighting this catalyst as a promising candidate for the next steps of the process development.
Versión del editorhttp://dx.doi.org/10.1016/j.jpowsour.2017.07.075
URIhttp://hdl.handle.net/10261/167525
DOI10.1016/j.jpowsour.2017.07.075
ISSN0378-7753
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