open access publication

Article, 2024

Flue-to-fuel: Bio-integrated carbon capture and utilization of dilute carbon dioxide gas streams to renewable methane

Energy Conversion and Management, ISSN 1879-2227, 0196-8904, Volume 302, Page 118090, 10.1016/j.enconman.2024.118090

Contributors

Sieborg, Mads Ujarak 0000-0001-7938-2029 [1] Oliveira, Jean Maikon Santos [1] Ottosen, Lars Ditlev Mørck 0000-0002-6943-745X [1] Kofoed, Michael Vedel Wegener 0000-0002-0235-3569 (Corresponding author) [1]

Affiliations

  1. [1] Aarhus University
    2. [NORA names: AU Aarhus University; University; Denmark; Europe, EU; Nordic; OECD]

Abstract

Capturing carbon dioxide (CO2) from flue gases and utilizing it as a feedstock for the production of renewable chemicals and fuels has been identified as an essential step toward mitigating climate change. Conventional CO2 capture technologies, such as amine scrubbing, are impeded by their high energy demand due to the thermodynamically low driving force for desorbing CO2. A new concept is presented here that combines carbon capture with power-to-methane: Bio-integrated carbon capture and utilization (BICCU). It exploits the robustness of microbial catalysts to simultaneously desorb the CO2 from an amine-based absorbent and convert the captured CO2 to synthetic natural gas (CH4) in a single step using renewable hydrogen. Experimental results in batch reactors with synthetic flue gas and raw flue gas from a biogas engine demonstrate high microbial biocompatibility with amine methyl diethanolamine (MDEA), high microbial robustness towards impurities and oxygen in raw flue gas, and almost full bioavailability of the absorbed CO2 until 120 mM of MDEA.

Keywords

CH4, CO2, Power-to-Methane, absorber, absorbing CO2, amine scrubbing, amine-based absorbents, amines, batch, batch reactor, bioavailability, biocompatibility, biogas, biogas engine, capture, captured carbon dioxide, carbon, carbon capture, carbon dioxide, catalyst, changes, chemical, climate change, concept, conventional CO2, demand, desorb CO2, diethanolamine, dioxide, driving force, energy, energy demand, engineering, experimental results, feedstock, flue, flue gas, force, fuel, gas, gas stream, hydrogen, impurities, low driving force, methane, methyl diethanolamine, microbial catalysts, microbial robustness, mitigate climate change, natural gas, oxygen, production, production of renewable chemicals, raw flue gas, reactor, renewable chemicals, renewable hydrogen, results, robustness, scrub, stream, synthetic flue gas, synthetic natural gas, technology, thermodynamics, utilization

Data Provider: Digital Science

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