Optimization of PRIDEs –PolymeRIc Deep Eutectic solvents - for CO2 capture

• Autor(a) principal: Inocêncio, Marta
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/162182
• topic: CO2 capture; physical absorption; Nuclear Magnetic Resonance Spectroscopy (NMR); Polymeric Deep Eutectic Solvents (PRIDES); Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias

Climate change is recognized as a direct consequence of the escalating Greenhouse Effect driven by greenhouse gases. Carbon Dioxide (CO2) contributed to over 55% of this effect and has experienced exponential emissions since the Industrial Revolution. To mitigate the concentration of CO2 in the atmosphere, various methods and technologies have been developed, with chemical absorption using monoethanolamide (MEA) being the most commonly employed. However, this method demands specific conditions for absorption and significant energy consumption, underscoring the necessity for more sustainable capture solutions. One promising avenue for achieving sustainable carbon capture was through the utilization of Deep Eutectic Solvents (DES). This master's thesis aimed to explore the application of Polymeric Deep Eutectic Solvents (PRIDES), a subclass of DES for the capture of CO2 under ambient temperature and atmospheric pressure conditions. This subclass merges the favorable properties of liquid polymers (high surface area, lower energy requirements regeneration) with the environmental advantages and versatility in tailoring for specific applications presented in DES. The work developed involved an array of analytical techniques, including Differential Scanning Calorimetry (DSC) and Fourier-Transform Infrared Spectroscopy (FTIR), to elucidate hydrogen bonding effects, while Nuclear Magnetic Resonance spectroscopy (NMR) was employed to analyze intermolecular interactions and quantify CO2 capture. By using NMR, we could observe in situ both the physical and chemical (when present) sorption effects, evaluating the impact of the anion, the length of the polymeric chain, and the presence of functional groups capable of chemical sorption. Among the PRIDES studied, the PRIDES derived from PEG-600 exhibited the most promising performance, with TBAB+PEG-600 and DBU+PEG-600 achieving CO2 capture rates of 87.89 and 89.41 mmol CO2 per kilogram of PRIDES, respectively. These findings highlight the potential of PRIDES as an environmentally friendly strategy to capture CO2 emissions at mild pressure and temperature conditions.