Steam iron process represents a technology for H2 production based on iron redox cycles. FexOy are reduced by syngas/carbon to iron, which is subsequently oxidized by steam to produce pure H2. However, the system shows low stability. In this work, the effect of promoters (Al2O3, MgO and CeO2) on FexOy stability is investigated (10 consecutive redox cycles). Bioethanol is used as a reducing agent. The particles are synthesized by coprecipitation method, analysed by BET, XRD, SEM and tested in a fixed bed reactor (675 °C, 1 bar). Pure H2 is obtained controlling the FexOy reduction degree feeding different amounts of ethanol (4.56–1.14 mmol) until no CO is detected in oxidation. The results show that the promoters not only improve the thermal stability of FexOy but also affect its redox activity and react with iron forming spinel structures. MgO led to the highest activity and cyclability (H2 = 0.15 NL; E = 35%).

The role of Al2O3, MgO and CeO2 addition on steam iron process stability to produce pure and renewable hydrogen / de Caprariis, B.; Damizia, M.; De Filippis, P.; Bracciale, M. P.. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - 46:79(2021), pp. 39067-39078. [10.1016/j.ijhydene.2021.09.135]

The role of Al2O3, MgO and CeO2 addition on steam iron process stability to produce pure and renewable hydrogen

de Caprariis B.
Primo
Validation
;
Damizia M.
Secondo
Methodology
;
De Filippis P.
Penultimo
Conceptualization
;
Bracciale M. P.
Ultimo
Investigation
2021

Abstract

Steam iron process represents a technology for H2 production based on iron redox cycles. FexOy are reduced by syngas/carbon to iron, which is subsequently oxidized by steam to produce pure H2. However, the system shows low stability. In this work, the effect of promoters (Al2O3, MgO and CeO2) on FexOy stability is investigated (10 consecutive redox cycles). Bioethanol is used as a reducing agent. The particles are synthesized by coprecipitation method, analysed by BET, XRD, SEM and tested in a fixed bed reactor (675 °C, 1 bar). Pure H2 is obtained controlling the FexOy reduction degree feeding different amounts of ethanol (4.56–1.14 mmol) until no CO is detected in oxidation. The results show that the promoters not only improve the thermal stability of FexOy but also affect its redox activity and react with iron forming spinel structures. MgO led to the highest activity and cyclability (H2 = 0.15 NL; E = 35%).
2021
bioethanol; chemical looping hydrogen; iron oxide; stability promoter; steam iron
01 Pubblicazione su rivista::01a Articolo in rivista
The role of Al2O3, MgO and CeO2 addition on steam iron process stability to produce pure and renewable hydrogen / de Caprariis, B.; Damizia, M.; De Filippis, P.; Bracciale, M. P.. - In: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - ISSN 0360-3199. - 46:79(2021), pp. 39067-39078. [10.1016/j.ijhydene.2021.09.135]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1606342
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