Chemical Looping Hydrogen (CLH) allows the direct production of pure hydrogen exploiting the redox properties of Fe, with high flexibility on the type of reductant used. In this work, a highly pure hydrogen stream suitable for the direct use into Proton Exchange membrane Fuel Cells was produced, using bioethanol as renewable fuel. The influence of both redox temperature (675°C–750 °C) and chemical composition of the Fe-based particles (2 wt% and 40 wt% of alumina added) on the carbon formation rate during reduction step was also deeply analyzed. Al2O3 changed both FexOy redox kinetics and equilibrium phases, leading to a complete iron deactivation at high Al2O3 concentration. The addition of an air oxidation step (3 steps CLH) is fundamental to restore the redox activity, with a constant efficiency of about 30% at 750 °C for 10 cycles. Furthermore, Al2O3 promotes the ethanol conversion into carbon, undermining the hydrogen purity.

Efficient utilization of Al2O3 as structural promoter of Fe into 2 and 3 steps chemical looping hydrogen process. Pure H2 production from ethanol / Damizia, Martina; Bracciale, Maria P.; Anania, Francesco; Tai, Lingyu; DE FILIPPIS, Paolo; DE CAPRARIIS, Benedetta. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - (2023). [10.1016/j.ijhydene.2023.04.067]

Efficient utilization of Al2O3 as structural promoter of Fe into 2 and 3 steps chemical looping hydrogen process. Pure H2 production from ethanol

Martina Damizia
Primo
Methodology
;
Maria P. Bracciale
Secondo
Methodology
;
Francesco Anania
Membro del Collaboration Group
;
Paolo De Filippis
Penultimo
Resources
;
Benedetta de Caprariis
Ultimo
Supervision
2023

Abstract

Chemical Looping Hydrogen (CLH) allows the direct production of pure hydrogen exploiting the redox properties of Fe, with high flexibility on the type of reductant used. In this work, a highly pure hydrogen stream suitable for the direct use into Proton Exchange membrane Fuel Cells was produced, using bioethanol as renewable fuel. The influence of both redox temperature (675°C–750 °C) and chemical composition of the Fe-based particles (2 wt% and 40 wt% of alumina added) on the carbon formation rate during reduction step was also deeply analyzed. Al2O3 changed both FexOy redox kinetics and equilibrium phases, leading to a complete iron deactivation at high Al2O3 concentration. The addition of an air oxidation step (3 steps CLH) is fundamental to restore the redox activity, with a constant efficiency of about 30% at 750 °C for 10 cycles. Furthermore, Al2O3 promotes the ethanol conversion into carbon, undermining the hydrogen purity.
2023
hydrogen; chemical looping; Al2O3; water splitting; iron oxide
01 Pubblicazione su rivista::01a Articolo in rivista
Efficient utilization of Al2O3 as structural promoter of Fe into 2 and 3 steps chemical looping hydrogen process. Pure H2 production from ethanol / Damizia, Martina; Bracciale, Maria P.; Anania, Francesco; Tai, Lingyu; DE FILIPPIS, Paolo; DE CAPRARIIS, Benedetta. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - (2023). [10.1016/j.ijhydene.2023.04.067]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1679691
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