A Step in Carbon Capture from Wet Gases: Understanding the Effect of Water on CO2 Adsorption and Diffusion in UiO-66Click to copy article linkArticle link copied!
- Yann Magnin*Yann Magnin*E-mail: [email protected]TotalEnergies@Saclay NanoInnov, 2 boulevard Thomas Gobert, 91120 Palaiseau Cedex, FranceMore by Yann Magnin
- Estelle DirandEstelle DirandTotalEnergies@Saclay NanoInnov, 2 boulevard Thomas Gobert, 91120 Palaiseau Cedex, FranceMore by Estelle Dirand
- Alejandro OrsikowskyAlejandro OrsikowskyTotalEnergies, OneTech, Sustainability R&D, PERL, 64170 Lacq, FranceMore by Alejandro Orsikowsky
- Mélanie PlainchaultMélanie PlainchaultTotalEnergies, OneTech, Upstream R&D, CSTJF, Avenue Larribau, 64018 Pau Cedex, FranceMore by Mélanie Plainchault
- Véronique PugnetVéronique PugnetTotalEnergies, OneTech, Sustainability R&D, CSTJF, Avenue Larribau, 64018 Pau Cedex, FranceMore by Véronique Pugnet
- Philippe CordierPhilippe CordierTotalEnergies@Saclay NanoInnov, 2 boulevard Thomas Gobert, 91120 Palaiseau Cedex, FranceMore by Philippe Cordier
- Philip L. LlewellynPhilip L. LlewellynTotalEnergies, OneTech, Sustainability R&D, CSTJF, Avenue Larribau, 64018 Pau Cedex, FranceMore by Philip L. Llewellyn
Abstract

Understanding the role played by moisture in CO2 sorption is key for designing the next generation of solid sorbents such as metal–organic frameworks, which can be used for carbon capture and conversion as well as for molecular sieving, energy storage, etc. The abundance of water in nature and industrial processes, including in anthropogenic sources of CO2 has been shown to significantly affect commercial adsorbent performances, including their uptake capacity and selectivity. However, less is known about the role of humidity on CO2 diffusion, even though it is crucial for economically viable rapid capture processes. In this work, we have used atomistic simulations and experiments to gain insight into the effect of humidity on CO2 adsorption, diffusion and transport properties in UiO-66(Zr), here described as a flexible structure. We show that depending on the water concentration adsorbed in the host nanoporosity, the CO2 adsorption can be enhanced or reduced depending on thermodynamic conditions. At low water loading, isolated molecules interact with low-energy sites of the sorbent. At higher loading, nucleation drives water cluster formation, followed by cluster percolation resulting in a sub-nanoporous adsorbing media decreasing the overall CO2 diffusion compared to the dry structures. We finally show that equilibrium parameters such as self-diffusion coefficients and isotherms can be used to describe the CO2 transport in dry and humid structures through the nano-Darcy equation.
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