Engineering Amine-Based Solid Adsorbents for Carbon Capture From Dilute CO2 Streams

A prominent methodology to tune the adsorption properties of solids for applications in CO2 capture is to functionalize them with amines sites, as the amine-CO2 interaction is strong under a variety of conditions [1].  Specifically, amine-modified solids such as porous silicates and MOFs are now well-studied under conditions that simulate post-combustion CO2 capture.  In addition, we have recently shown that supported amine materials are promising solids for removal of CO2 from ultra-dilute gas sources such as the ambient air [2-4].

This talk will focus on the engineering of inorganic-organic hybrids amine adsorbents to enhance their CO₂ adsorption performance, with a specific focus on CO₂ adsorption capacity, adsorption kinetics and stability to practical desorption conditions. The structures of various hybrid silica-based and MOF-based adsorbents were modified by tuning the both the host substrate and the surface amine functionalities.  Structure-property relationships for these materials are under development, and based on these studies, we will discuss the potential to design inorganic-organic hybrid adsorbents with desired CO₂ adsorption characteristics, such as the ability to extract CO₂ efficiently from ambient air.

[1] S. Choi, J. H. Drese, C. W. Jones, ChemSusChem 2009, 2, 796-854.

[2] S. Choi, J. H. Drese, P. M. Eisenberger, C. W. Jones, AIChE Annual Meeting, Nashville, Tennessee, 2009.

[3] S. Choi, J. H. Drese, P. M. Eisenberger, C. W. Jones, Env. Sci. Technol., 2011, 45, 2420-2427.

[4] S. Choi, M. L. Gray, C. W. Jones, ChemSusChem, 2011, 10.1002/cssc.201000355