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Projeto de investigação
Efficient CO2 capture and valorisation with 3D printed catalytic reactors
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Ionic liquids and biomass as carbon precursors
Publication . Ribeiro, Mónica Stanton; Zanatta, Marcileia; Corvo, Marta C.; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); DCM - Departamento de Ciência dos Materiais; Elsevier Science B.V., Amsterdam.
The alarming rise in carbon dioxide (CO2) emissions has been met with urgent calls to the scientific community and global enterprises. As a solution, CO2 capture and conversion could remove, store, and properly convert some of the gas into useful substances. The present review highlights the use of ionic liquids (ILs) and biomass for the preparation of nitrogen-doped (N-doped) porous carbons that can serve as CO2 adsorbents and catalysts for conversion reactions of the same gas. The physical and chemical properties of ILs (tunability, stability, controllability) as well as the economic viability of biomass (inexpensiveness, availability, renewability, and environmental friendliness) have piqued the interest of researchers in this field of study. This review also provides the different carbonization methodologies in detail, and the effects of biomass origin, carbonization methodology and processing parameters on the final properties of the porous carbons are summarized. Strong efforts have been applied to the use of biomass and/or IL-based carbons in CO2 capture showing promising results for this application, while the development of carbon catalysts with biomass and /or ILs is still in its infancy, although promising results can already be seen in the literature.
From biopolymer dissolution to CO2 capture under atmospheric pressure
Publication . Lopes, Mónica; Cecílio, André; Zanatta, Marcileia; Corvo, Marta C.; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); DCM - Departamento de Ciência dos Materiais; Elsevier
Finding a cheap and easily recycling material that can capture CO2 under atmospheric pressure (1 atm) is of paramount importance. In this context, combining ionic liquids (ILs) with abundant and natural materials, such as chitin-based biopolymers, appears as an interesting alternative. In this work, four acetate-based ILs were selected to explore the solubility of chitin, chitosan, and carboxymethyl-chitosan. Using carboxymethyl-chitosan and biopolymer monomer units as models, different Nuclear Magnetic Resonance (NMR) techniques, namely, 1H, 13C, nuclear Overhauser effect spectroscopy, and spin-lattice relaxation, were performed to evaluate the dissolution. Shrimp shells were used as a chitin source. Through a simple acid/base treatment, it was possible to remove minerals and proteins, and use it to prepare biopolymer@IL materials for CO2 capture tests. Efficient CO2 sorption capacity was observed upon bubbling CO2 with a maximum of 2.32 mmolCO2/gsorbent. Under N2 bubbling, the system demonstrated excellent recycling capacity using a room temperature procedure that outperformed aqueous amine solutions recycling. The absence of heating and vacuum recycling procedures, combined with the use of N2 or compressed air is much more appealing for industrial applications.
Poly(ionic liquid)-based aerogels for continuous-flow CO2 upcycling
Publication . Barrulas, Raquel V.; Tinajero, Cristopher; Ferreira, Diogo P. N.; Illanes-Bordomás, Carlos; Sans, Victor; Carrott, Manuela Ribeiro; García-González, Carlos A.; Zanatta, Marcileia; Corvo, Marta C.; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); DCM - Departamento de Ciência dos Materiais; Elsevier BV
The atmospheric concentration of CO2 is rising at an alarming pace, creating a pressing need for new and sustainable materials capable of capture and conversion. Poly(ionic liquid)s (PILs) are particularly effective catalysts for processes at or near atmospheric pressure. PILs industrial application poses challenges due to the low porosity of PIL, the limited batch conversion capacity, and the difficulties in reuse. To overcome these limitations, we herein propose the use of AEROPILs catalysts obtained from the integration of PILs in chitosan-based aerogels. These cost-effective highly porous materials have unique and tuneable porous properties making them not only ideal sustainable CO2 sorbents but also promising heterogeneous catalysts. While AEROPILs show moderate yields for CO2 conversion in batch mode, high catalytic activity was achieved when AEROPILs were used to catalyse the CO2 cycloaddition reaction to epoxides in packed-bed reactors operated under continuous flow. The catalytic activity and stability were maintained over 60 h without activity loss, and high productivity (space-time yield of 21.18 gprod h−1 L−1). This research reveals the pioneering use of AEROPILs to efficiently upcycle CO2 into cyclic carbonate under a continuous flow setup.
The AEROPILs generation: Novel poly(ionic liquid)‐based aerogels for CO2 capture
Publication . Barrulas, Raquel V.; López‐iglesias, Clara; Zanatta, Marcileia; Casimiro, Teresa; Mármol, Gonzalo; Carrott, Manuela Ribeiro; García‐gonzález, Carlos A.; Corvo, Marta C.; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); DCM - Departamento de Ciência dos Materiais; LAQV@REQUIMTE; DQ - Departamento de Química; MDPI - Multidisciplinary Digital Publishing Institute
CO2 levels in the atmosphere are increasing exponentially. The current climate change effects motivate an urgent need for new and sustainable materials to capture CO2. Porous materials are particularly interesting for processes that take place near atmospheric pressure. However, materials design should not only consider the morphology, but also the chemical identity of the CO2 sorbent to enhance the affinity towards CO2. Poly(ionic liquid)s (PILs) can enhance CO2 sorption capacity, but tailoring the porosity is still a challenge. Aerogel’s properties grant production strategies that ensure a porosity control. In this work, we joined both worlds, PILs and aerogels, to produce a sustainable CO2 sorbent. PIL‐chitosan aerogels (AEROPILs) in the form of beads were successfully obtained with high porosity (94.6–97.0 %) and surface areas (270–744 m2/g). AEROPILs were applied for the first time as CO2 sorbents. The combination of PILs with chitosan aerogels generally increased the CO2 sorption capability of these materials, being the maximum CO2 capture capacity obtained (0.70 mmol g−1, at 25 °C and 1 bar) for the CHT:P[DADMA]Cl30% AEROPIL.
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Entidade financiadora
European Commission
Programa de financiamento
H2020
Número da atribuição
101026335