ORALS

SESSION: MoltenFriPM2-R1	Angell International Symposium on Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability (7th Intl. Symp. on Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability).
Fri Oct, 25 2019 / Room: Ambrosia A (77/RF)
Session Chairs: Rasmus Fehrmann; Masahiro Yoshizawa-Fujita; Session Monitor: TBA

15:55: [MoltenFriPM209] Keynote
Poly(ionic liquids) as a platform for CO2 capture and transformation
Sandra Einloft¹ ; Franciele Bernard¹ ; ¹PUCRS, Porto Alegre, Brazil;
Paper Id: 116 [Abstract]

The largest anthropogenic contribution to climate change is the fossil fuel burning resulting in huge carbon dioxide (CO₂) emissions. Reduction of CO₂ emissions is imperative to mitigate environmental impacts. CO₂ separation can help global warming mitigation as well as provide CO₂ for other processes such as carbon capture and utilization (CCU) and enhanced oil recovery (EOR). Yet CO₂ is an abundant nontoxic resource that can be used in several applications. Chemical absorption processes for CO₂ capture using aqueous amine solutions have been extensively studied and used in industry for decades. They have, however, some operational drawbacks. Ionic liquids have been proposed as the next generation of solvents for a selective CO₂ separation. These compounds are versatile and less harmful to the environment than conventional organic solvents. They present unique properties such as negligible vapor pressure, non-flammability, high thermal stability, and tunability (myriad of possible combinations of cations and anions). Nevertheless, these solvents suffer from high viscosity and high production costs when compared to aqueous amines solutions. Poly(ionic liquid)s (PILs) appear as an alternative to RTIL for CO₂ capture and utilization. PILs represent an emerging subclass of the polyelectrolytes, were each repeating unit is ionic and connected through a polymeric backbone forming a macromolecular structure[1]. PILs combine the good features of RTILs with good mechanical stability, processing and tunable macromolecular design of polymeric material. PILs present higher CO₂ sorption capacity and sorption/desorption velocity than RTIL. PILs, materials with smart designs, can be used for CO₂ separation from the flue gas (CO₂/N₂), and natural gas purification (CO₂/CH₄), besides being active as catalyst for cyclic carbonate production from the reaction of CO₂ and epoxide. The aim of this presentation is to give a concise overview of PILs described in literature, as well as the research published by our group[1-5]. In addition, PLIs syntheses routes, as well as the influence of PILs backbone, anions type, and modification in CO₂ sorption capacity and catalyst activity will be discussed.

References:
1- Einloft, S.; Bernard, F. L.; Dalla Vecchia, F. In Polymerized Ionic Liquids; Eftekhari, A., Ed.; 2017; pp 489-514.
2- Bernard, F. L.; Polesso, B. B.; Cobalchini, F. W.; Donato, A. J.; Seferin, M.; Ligabue, R.; Chaban, V. V.; do Nascimento, J. F.; Dalla Vecchia, F.; Einloft, S. Polymer (Guildf). 2016, 102, 199-208.
3- Magalhaes, T. O.; Aquino, A. S.; Dalla Vecchia, F.; Bernard, F. L.; Seferin, M.; Menezes, S. C.; Ligabue, R.; Einloft, S. RSC Adv. 2014, 4, 18164-18170.
4- Bernard, F. L.; Duczinski, R. B.; Rojas, M. F.; Fialho, M. C. C.; Carreño, L. Á.; Chaban, V. V.; Vecchia, F. D.; Einloft, S. Fuel 2018, 211, 76-86.
5- Bernard, F. L.; Polesso, B. B.; Cobalchini, F. W.; Chaban, V. V.; do Nascimento, J. F.; Dalla Vecchia, F.; Einloft, S. Energy & Fuels 2017, 31, 9840-9849.

SESSION: AdvancedMaterialsFriPM2-R2	5th Intl. Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development
Fri Oct, 25 2019 / Room: Leda (99/Mezz. F)
Session Chairs: Tetiana Prikhna; Ruiyuan Liu; Session Monitor: TBA

17:10: [AdvancedMaterialsFriPM212]
Cycloaddition of Carbon Dioxide to Cyclic Carbonate Catalyzed by Silica Xerogel Functionalized with Imidazolium-Based Ionic Liquids
Daniela Rodrigues¹ ; Leonardo Dos Santos¹ ; Franciele Bernard¹ ; Ingrid Pinto¹ ; Sandra Einloft¹ ; ¹PUCRS, Porto Alegre, Brazil;
Paper Id: 66 [Abstract]

The increase in carbon dioxide (CO₂) emissions from burning fossil fuels is the largest contributor to global warming of anthropic origin. Nevertheless, CO₂ is a nontoxic, nonflammable, and renewable feedstock. CO₂ utilization for the production of cyclic carbonates has gained great notoriety in the last decades because it is an environmentally benign alternative to reduce CO₂ emissions. Cyclic carbonates can be used as intermediates in the synthesis of fine chemicals, as monomers in polymerization reactions and as aprotic polar solvents. Cyclic carbonate is produced by cycloaddition of CO₂ with epoxides in the presence of catalysts due to CO₂ thermodynamical stability. Currently, the exploration of efficient catalysts for CO₂ coupling reactions is still necessary to promote an efficient reaction [1]. Ionic liquids (ILs) are salts composed of organic cations and organic or inorganic anions with melting point lower than 100°C [2]. These compounds have been proposed as homogeneous catalysts. The high price of ILs, however, and the difficulty to separate ILs from reaction media represent a barrier to implement them in the industry [3]. One solution for overcoming this disadvantage is silica xerogel functionalization with ILs [4]. In this study, a series of silica xerogels functionalized with imidazolium-based ILs ([BMIM][Cl], [BMIM][NTf2], [MBMIM][NTf2], [EMIM][NTf2], [EMIM][MSO₃] and [EMIM] [CF₃SO₃]) were synthesized by sol gel method and characterized by BET, RAMAN, TGA, FESEM and TEM. The catalytic performance of these compounds for CO₂ chemical transformation into cyclic carbonates by cycloaddition of CO₂ with epoxides was investigated. All cycloaddition reactions were performed at 40 bars and 110°C during six hours in a 120 cm³ titanium reactor equipped with magnetic stirring and temperature controller. The highest yield was obtained with [BMIM][Cl] (82.6%) and [EMIM][MSO3] (91.6%), both showing 99% selectivity. These results highlight the potential of these compounds as new catalysts.

References:
[1] L. Liu, S. M. Wang, Z. B. Han, M. Ding, D. Q. Yuan and H. L. Jiang, Inorganic Chemistry, 2016, 55, 3558-3565.
[2] R. M. Cuéllar-Franca and A. Azapagic, Journal of CO2 Utilization, 2015, 9, 82-102.
[3] A. Cherian, K. Robin, B. Jose and T. Roshith, Catalysis Surveys from Asia, 2015, 19, 223-235.
[4] Vidinha P, Augusto V, Almeida M, et al. Sol-gel encapsulation: An efficient and versatile immobilization technique for cutinase in non-aqueous media. J Biotechnol 2006, 121:23-33.