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

D. Andirova, Y. Lei, C. Cogswell, S. Choi
Northeastern University, US

Keywords: carbon capture, nanomaterials

Summary:

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, supported amine adsorbents such as amine-modified porous silicates 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 simulated ambient air [2-4]. This talk will focus on the engineering of inorganic-organic hybrids amine adsorbents made by functionalization of metal organic frameworks to enhance their CO2 adsorption performance, with a specific focus on materials stability under the adsorption conditions close to those of practical application, which often contains significant amount of humidity in the stream. The structures of MOF-based hybrid adsorbents were modified by tuning the both the host substrate and the surface amine functionalities. Structure-property relationships for these materials are investigated, and based on these studies, we will discuss the potential to design functional hybrid adsorbents with desired CO2 adsorption characteristics and stability.