title: Adsorption Microcalorimetry of CO2in Confined Aminopolymers.
abstract: Aminopolymers confined within mesoporous supports have shown promise as materials for direct capture of CO2from ambient air. In spite of this, relatively little is known about the energetics of CO2binding in these materials, and the limited calorimetric studies published to date have focused on materials made using molecular aminosilanes rather than amine polymers. In this work, poly(ethylenimine) (PEI) is impregnated within mesoporous SBA-15, and the heats of CO2adsorption at 30 °C are investigated using a Tian-Calvet calorimeter with emphasis on the role of PEI loading and CO2pressure in the compositional region relevant to direct capture of CO2from ambient air. In parallel, CO2uptakes of these materials are measured using multiple complementary approaches, including both volumetric and gravimetric methods, and distinct changes in uptake as a function of CO2pressure and amine loading are observed. The CO2sorption behavior is directly linked to textural data describing the porosity and PEI distribution in the materials.
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Potter
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Simon H
authors.identifier: 0000-0003-2913-1648
authors.initials: SH
authors.lastname: Pang
authors.affiliation: School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive, Atlanta, Georgia 30332, United States.
authors.forename: Christopher W
authors.identifier: 0000-0003-3255-5791
authors.initials: CW
authors.lastname: Jones
mesh_terms: D000327:Adsorption; D002151:Calorimetry; D002245:Carbon Dioxide; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide
chemical_list: D011108:Polymers; C509969:SBA-15; D002245:Carbon Dioxide; D012822:Silicon Dioxide