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The capture and concentration of CO2 by cyclic adsorption–desorption processes in indoor air environments are studied. A synthesized Y-type zeolite was impregnated with amines used to capture CO2 to maintain good indoor air quality (IAQ). Three kinds of amines, including monoethanol amine (MEA), isopropanol amine (IPA), and tetraethylenepent amine (TEPA), were selected to study the performance of CO2 adsorption capacity at a fixed-bed in an 80-L air chamber. These Y8 loaded with amines were examined with a Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Infrared Spectroscope (IR) and Thermogravimetric Analyzer (TGA) to determine their textural properties before and after amines-impregnation. The CO2 adsorption capacities of modified Y8 was substantially higher than that of the original Y8 adsorbent, and the highest capacity was up to 158 mg/g-adsorbent-hr. This study shows that the order of adsorption capacity for the three types of amines was TEPA > MEA > IPA. The first-order kinetic model was best fitted to adsorb CO2. The rate constant (k) of the first-order adsorption model can be further used for the design and application of a CO2 control system in IAQ. The results of this study show that amines functionalized Y8 have excellent adsorption potential for removing indoor CO2.

CO2 Adsorption by Y-Type Zeolite Impregnated with Amines in Indoor Air