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

Martina Damizia, Maria Paola Bracciale, Seyedmohammad Mousavi, Lingyu Tai, Paolo De Filippis and Benedetta de Caprariis

Renewable Energy, 2024, vol. 232, issue C

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).

Keywords: HTL; Iron; Hydrogen producer; Lignocellulosic biomass; Sustainable bio-crude production (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:232:y:2024:i:c:s0960148124012072

DOI: 10.1016/j.renene.2024.121139

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