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Liquid-like Hybrid Sorbents for Carbon Capture: Investigation of CO2/Sorbent Interactions, Sorbent Viscosity and CO2 Diffusivity

Liquid-like Hybrid Sorbents for Carbon Capture: Investigation of CO2/Sorbent Interactions, Sorbent Viscosity and CO2 Diffusivity

Authors: 
Petit, C. - Presenter, Imperial College London
Park, A. H. A. - Presenter, Columbia University
Lin, K. Y. A. - Presenter, National Chung Hsing University

Several novel solvents have been proposed as potential alternatives to amine-based aqueous solutions for CO2 capture. Among them, one can cite Nanoparticle Organic Hybrid Materials (NOHMs). These liquid-like nanomaterials are synthesized by grafting polymer chains onto an inorganic nanocore, which ensures both thermal stability and negligible vapor pressure, two of the key features of ideal CO2 capture solvents. Understanding how CO2 molecules interact with the given solvent can lead to the design of recyclable sorbents with enhanced capture capacity. Asides from the capture capacity, the kinetics of CO2 absorption and therefore the viscosity of the solvent as well as the CO2 diffusivity are other important parameters to consider when designing a CO2 capture solvent. This study was therefore conducted to highlight the key mechanisms of CO2 absorption in NOHMs and to determine the NOHMs viscosity and the CO2 diffusivity in NOHMs under different conditions. Towards this goal, NOHMs exhibiting varying chemistries and structures were synthesized, characterized and tested for CO2 capture. The results will be discussed taking into account the structural and chemical factors of the NOHMs, i.e.: the organic/inorganic ratio, the size and type of the inorganic nanocore as well as the functional groups of the polymeric chains.

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