Enhancing CO2 absorption for post-combustion carbon capture via zinc-based biomimetic catalysts in industrially relevant amine solutions
| Autor: | Rachael A. Kelsey, Kunlei Liu, Sean Parkin, Leland R. Widger, Cameron A. Lippert, Chad Risko, Moushumi Sarma |
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| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Ligand chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences Management Monitoring Policy and Law Carbon sequestration 01 natural sciences Pollution Industrial and Manufacturing Engineering Catalysis General Energy 020401 chemical engineering Chemical engineering chemistry Mass transfer Greenhouse gas Amine gas treating 0204 chemical engineering 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Greenhouse Gas Control. 85:156-165 |
| ISSN: | 1750-5836 |
| Popis: | Anthropogenic greenhouse gas emissions, such as CO2 from fossil fuel combustion, are a global environmental, health, and economic concern. Aqueous amine-based CO2 capture processes offer a technologically mature and relevant approach to CO2 sequestration, although cost reduction strategies are still necessary for widespread deployment. Inspired by the metalloenzyme carbonic anhydrase (CA), we report the design, synthesis, and activity testing of zinc(II) complexes [ZnII(PSAAMP)Cl2] (1) and [ZnII(PSAMEA)Cl2] (2) as CO2 hydration catalysts in aqueous amine solutions. The novel multifunctional ligand environment includes features in the primary and secondary coordination spheres that result in enhanced CO2 mass transfer in industrially relevant carbon capture solvents and stability towards harsh industrial process conditions. Complexes that lack these key features do not show enhanced CO2 absorption. Density functional theory (DFT) calculations that assess the catalytic pathway demonstrate how 1 and 2 catalyze CO2 hydration analogous to CA. These catalysts increase mass transfer by 20–55% in lab scale experiments, offering the potential to reduce the cost of amine-based CO2 capture processes without significantly altering industrial-scale system design, making rapid deployment of this critical bridge technology a viable strategy to reduce global greenhouse gas emissions. |
| Databáze: | OpenAIRE |
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