Red mud, a main waste of aluminum industry containing high amount of Fe2O3 (20–30 %), was used for the first time post-reduction as iron source in the hydrothermal liquefaction (HTL) of pinewood; aiming to maximize bio-crude yield and quality, exploiting the Fe oxidation with water to produce in-situ H2. The red mud capacity to produce H2 was investigated reducing it with the hydrochar produced through HTL at 900 °C for 3h. Red mud catalytic activity in biomass decomposition reactions, attributed to the presence of Al2O3, TiO2, SiO2 etc., was also assessed testing the as-received (FRM) and calcinated (CRM, 900 °C-3h) samples. HTL tests were performed at 330 °C for 10 min, adding an amount of red mud containing 6 wt% of Fe with respect to the biomass. The reduced red mud (RRM) demonstrated the highest activity in the conversion of biomass into high quality bio-crude (yield of 49 wt%, HHV = 30.81 MJ/kg), acting both as H2 producer and as a catalyst. Furthermore, to minimize the process wastes, the recycle of water phase (WP) and the RRM was performed for 5 consecutive runs demonstrating the feasibility of the proposed process with a considerable increase of bio-crude yield (60 wt%) and quality (HHV = 30.89 MJ/kg).

Red mud as hydrogen producer in hydrothermal liquefaction of pinewood: Minimization of process wastes by recycling the water and hydrochar phases / Damizia, M.; Bracciale, M. P.; Mousavi, S.; Tai, L.; De Filippis, P.; de Caprariis, B.. - In: RENEWABLE ENERGY. - ISSN 0960-1481. - 232:(2024), pp. 1-10. [10.1016/j.renene.2024.121139]

Red mud as hydrogen producer in hydrothermal liquefaction of pinewood: Minimization of process wastes by recycling the water and hydrochar phases

Damizia M.
Primo
Conceptualization
;
Bracciale M. P.
Secondo
Investigation
;
Mousavi S.
Investigation
;
Tai L.
Data Curation
;
De Filippis P.
Penultimo
Funding Acquisition
;
de Caprariis B.
Ultimo
Supervision
2024

Abstract

Red mud, a main waste of aluminum industry containing high amount of Fe2O3 (20–30 %), was used for the first time post-reduction as iron source in the hydrothermal liquefaction (HTL) of pinewood; aiming to maximize bio-crude yield and quality, exploiting the Fe oxidation with water to produce in-situ H2. The red mud capacity to produce H2 was investigated reducing it with the hydrochar produced through HTL at 900 °C for 3h. Red mud catalytic activity in biomass decomposition reactions, attributed to the presence of Al2O3, TiO2, SiO2 etc., was also assessed testing the as-received (FRM) and calcinated (CRM, 900 °C-3h) samples. HTL tests were performed at 330 °C for 10 min, adding an amount of red mud containing 6 wt% of Fe with respect to the biomass. The reduced red mud (RRM) demonstrated the highest activity in the conversion of biomass into high quality bio-crude (yield of 49 wt%, HHV = 30.81 MJ/kg), acting both as H2 producer and as a catalyst. Furthermore, to minimize the process wastes, the recycle of water phase (WP) and the RRM was performed for 5 consecutive runs demonstrating the feasibility of the proposed process with a considerable increase of bio-crude yield (60 wt%) and quality (HHV = 30.89 MJ/kg).
2024
HTL; Hydrogen producer; Iron; Lignocellulosic biomass; Sustainable bio-crude production
01 Pubblicazione su rivista::01a Articolo in rivista
Red mud as hydrogen producer in hydrothermal liquefaction of pinewood: Minimization of process wastes by recycling the water and hydrochar phases / Damizia, M.; Bracciale, M. P.; Mousavi, S.; Tai, L.; De Filippis, P.; de Caprariis, B.. - In: RENEWABLE ENERGY. - ISSN 0960-1481. - 232:(2024), pp. 1-10. [10.1016/j.renene.2024.121139]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1717438
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