Tuneable naphthalene-based porous polyimide networks for CO 2 capture and conversion Basiram Brahma Narzary 2 , Jerry Mintah 1 , Dr. Benjamin C. Baker 1 , Dr. Jie Chen 3 and Prof. Charl FJ Faul 1 1 School of Chemistry, University of Bristol, UK, 2 University of Bristol, UK, 3 Fuzhou University, China Climate change is a significant global challenge and a serious threat to the planet. Several strategies have been proposed to reduce the emission of anthropogenic CO 2 (carbon dioxide) and to explore the use of CO 2 as an abundant feedstock to produce sustainable fuels. Capturing CO 2 using porous polymers and converting it into valuable chemical feedstocks is a promising solution to this problem. Crosslinked porous polyimides (pPIs), a type of porous organic polymer (POP), offer great potential for CO 2 capture and conversion, owing to their porous nature and excellent chemical and thermal stabilities. 1, 2 However, incompatibility of solvents during the condensation of the material can yield into lower surface areas and by that limits the total gas uptake. The Bristol-Xian-Jiaotong (BXJ) approach to tune solvent-polymer compatibility can be employed to optimise the synthesised pPIs and their resulting functionality. 3, 4 In this approach inorganic salts are used to tune the porosity and enhance the surface area by tuning the compatibility of the reaction solvent and the growing porous polymer. By implementing the BXJ approach, pPIs were optimised to enable CO 2 capture of up to 14 wt%. Additionally, the pPIs were successfully utilised to electrocatalytically reduce CO 2 to methanol and formate with Faradaic efficiencies of up to 85% and 95%, respectively. Further investigation shows that pPIs can incorporate CO 2 into epoxides (epichlorohydrin) to form cyclic carbonates ((chloromethyl)ethylene carbonate) with 98% conversion. References 1. Y. Liao, J. Weber and C. F. J. Faul, Macromolecules , 2015 , 48, 2064-2073. 2. B. B. Narzary, B. C. Baker, N. Yadav, V. D'Elia and C. F. J. Faul, Polymer Chemistry , 2021 , 12, 6494-6514. 3. J. Chen, W. Yan, E. J. Townsend, J. Feng, L. Pan, V. Del Angel Hernandez and C. F. J. Faul, A ngew Chem Int Ed Engl , 2019 , 58, 11715-11719. 4. J. Chen, T. Qiu, W. Yan and C. F. J. Faul, Journal of Materials Chemistry A , 2020, 8, 22657-22665.
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