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Green and simple approach for low-cost bioproducts preparation and CO2 capture

Durán-Jiménez, G; Kostas, ET; Stevens, LA; Meredith, W; Erans, M; Hernández-Montoya, V; Buttress, A; ... Binner, E; + view all (2021) Green and simple approach for low-cost bioproducts preparation and CO2 capture. Chemosphere , 279 , Article 130512. 10.1016/j.chemosphere.2021.130512. Green open access

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Abstract

This study has demonstrated, for the first time, a simple, fast and flexible microwave processing method for the simultaneous preparation of bio-products (bio-oil, bio-gas and biochar) using a methodology that avoids any form of catalyst or chemical activation. The dielectric properties of biomass and physicochemical characterisation such as TGA, elemental and proximate analysis, XRD, SEM/EDX and textural properties, showed that 8 kJ g-1 of microwave energy can produce superior biochars for applications in CO2 capture. The maximum CO2 uptake capacity for biochar produced was 2.5 mmol g-1 and 2.0 mmol g-1 at 0 and 25 °C and 1 bar, which and also exhibited high gas selectivity compared with N2, fast kinetics of adsorption (<10 min) and desirable reusability (>95%) after 20 cycles. GC-MS analysis of generated bio-oil products revealed that higher microwave energies (>8 kJ g-1) significantly enhanced the amount of bio-oil produced (39%) and specifically the formation of levoglucosan, furfural and phenolics compounds, and bio-gas analysis identified trace levels of H2 and CH4. The results from this study confirm a green, inexpensive and efficient approach for biomass valorisation which can easily be embedded within bio-refinery process, and also demonstrates the potential of biochars for post-combustion CO2 uptake.

Type: Article
Title: Green and simple approach for low-cost bioproducts preparation and CO2 capture
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.chemosphere.2021.130512
Publisher version: http://dx.doi.org/10.1016/j.chemosphere.2021.13051...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Bio-oil, Biochar, CO(2) capture, Lignocellulosic biomass, Microwave pyrolysis
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10128690
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