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Rapid, simple and sustainable synthesis of ultra-microporous carbons with high performance for CO2 uptake, via microwave heating

Durán-Jiménez, G; Stevens, LA; Kostas, ET; Hernández-Montoya, V; Robinson, JP; Binner, ER; (2020) Rapid, simple and sustainable synthesis of ultra-microporous carbons with high performance for CO2 uptake, via microwave heating. Chemical Engineering Journal , 388 , Article 124309. 10.1016/j.cej.2020.124309. Green open access

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Abstract

A one step microwave pyrolysis-activation method has been developed for the preparation of activated carbons from biomass with high CO2 capture efficiency (5.3 mmol g−1) by employing a low impregnation ratio (1) of KOH and K2CO3. The high microwave susceptibility identified by the dielectric properties enabled the preparation of a series of activated carbons in short processing times (<6 min), and the pyrolysis-activation simultaneously enhanced the formation of ultra-micropores leading to high CO2 uptake at 15 and 100% CO2 in the temperature range of 0–100 °C. The high CO2/N2 selectivity of up to 36 the adsorptive capacities were directly correlated to a pore size of ~0.7 nm, which favoured CO2 uptake up to 5.3 and 4.5 mmol g−1 at 1.1 bar and 0 °C and an uptake of 3.7 and 3.3 at 25 °C for activated samples with KOH and K2CO3, respectively. The activated carbons presented in this study are the first examples of samples that have been prepared by this simple and rapid method, which represents a 96.66% reduction in the processing times in comparison to conventional heating routes, and the CO2 uptake is comparable to the largest reported in literature for activated carbons. The outstanding uptake and selectivity, the simple synthesis using microwave technology in addition to the utilisation of a waste biomass as a carbon precursor, satisfy the requirements for the development of new and more sustainable energy environmental processes.

Type: Article
Title: Rapid, simple and sustainable synthesis of ultra-microporous carbons with high performance for CO2 uptake, via microwave heating
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cej.2020.124309
Publisher version: https://doi.org/10.1016/j.cej.2020.124309
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: CO2 capture; Ultra-microporous adsorbents; Microwave; Selective uptake; Regeneration; Rapid sustainable preparation of activated carbons
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/10090858
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