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Inicio  /  Applied Sciences  /  Vol: 10 Par: 5 (2020)  /  Artículo
ARTÍCULO
TITULO

Non-Energy Valorization of Residual Biomasses via HTC: CO2 Capture onto Activated Hydrochars

Katia Gallucci    
Luca Taglieri    
Alessandro Antonio Papa    
Francesco Di Lauro    
Zaheer Ahmad and Alberto Gallifuoco    

Resumen

This study aims to investigate the CO2 sorption capacity of hydrochar, obtained via hydrothermal carbonization (HTC). Silver fir sawdust was used as a model material. The batch runs went at 200 °C and up to 120 min. The hydrochar was activated with potassium hydroxide impregnation and subsequent thermal treatment (600 °C, 1 h). CO2 capture was assayed using a pressure swing adsorption (PSA) process. The morphology and porosity of hydrochar, characterized through Brunauer-Emmett-Teller, Barrett-Joyner-Halenda (BET-BJH) and scanning electron microscopy (SEM) analyses, were reported and the sorbent capacity was compared with traditional sorbents. The hydrochar recovered immediately after the warm-up of the HTC reactor had better performances. The Langmuir equilibrium isotherm fits the experimental data satisfactorily. Selectivity tests performed with a model biogas mixture indicated a possible use of hydrochar for sustainable upgrading of biogas to bio-methane. It is conceivably a new, feasible, and promising option for CO2 capture with low cost, environmentally friendly materials.

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