Revealing the GHG reduction potential of emerging biomass-based CO2 utilization with an iron cycle system
2023
Jing Xu, Jiong Cheng, Runtian He, Jiaqi Lu, Chunling Wang, Heng Zhong, Fangming Jin
● Greenhouse gas mitigation by biomass-based CO2 utilization with a Fe cycle system. ● The system including hydrothermal CO2 reduction with Fe and Fe recovery by biomass. ● The reduction potential quantified by experiments, simulations, and an ex-ante LCA. ● The greatest GHG reduction potential is −34.03 kg CO2-eq/kg absorbed CO2. ● Ex-ante LCA supports process optimization to maximize GHG reduction potential. CO2 utilization becomes a promising solution for reducing anthropogenic greenhouse gas (GHG) emissions. Biomass-based CO2 utilization (BCU) even has the potential to generate negative emissions, but the corresponding quantitative evaluation is limited. Herein, the biomass-based CO2 utilization with an iron cycle (BCU-Fe) system, which converts CO2 into formate by Fe under hydrothermal conditions and recovers Fe with biomass-derived glycerin, was investigated. The GHG reduction potential under various process designs was quantified by a multidisciplinary method, including experiments, simulations, and an ex-ante life-cycle assessment. The results reveal that the BCU-Fe system could bring considerable GHG emission reduction. Significantly, the lowest value is −34.03 kg CO2-eq/kg absorbed CO2 (−2.44 kg CO2-eq/kg circulated Fe) with the optimal yield of formate (66%) and Fe (80%). The proposed ex-ante evaluation approach not only reveals the benefits of mitigating climate change by applying the BCU-Fe system, but also serves as a generic tool to guide the industrialization of emerging carbon-neutral technologies.
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