title: Stability of amine-functionalized cellulose during temperature-vacuum-swing cycling for CO2 capture from air.
abstract: The stability of amine-functionalized nanofibrilated cellulose sorbent for direct air capture of CO2 is investigated during temperature-vacuum-swing (TVS) cycling. The presence of O2 at 90 °C degrades the sorbent, reducing its CO2 adsorption capacity by 30% after 15 h of treatment in moist air with a dew point of 22 °C. In contrast, exposure to moist CO2 at 90 °C with a dew point of 22 °C does not deteriorate its CO2 adsorption capacity after 15 h. Performing 100 TVS consecutive cycles, with CO2 adsorption from ambient air containing 400-530 ppm CO2 at 30 °C and 60% relative humidity and with CO2 desorption at 90 °C and 30 mbar, resulted in a reduction of the equilibrium CO2 adsorption capacity by maximum 5%. The average CO2 adsorption capacity during TVS cyclic operation is 0.90 mmol CO2/g.
authors.affiliation: Department of Mechanical and Process Engineering, ETH Zürich , 8092 Zurich, Switzerland.
authors.forename: Christoph
authors.initials: C
authors.lastname: Gebald
authors.forename: Jan A
authors.initials: JA
authors.lastname: Wurzbacher
authors.forename: Philippe
authors.initials: P
authors.lastname: Tingaut
authors.forename: Aldo
authors.initials: A
authors.lastname: Steinfeld
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D000588:Amines / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D057139:Nanofibers / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D000588:Amines; D014867:Water; D002245:Carbon Dioxide; D002482:Cellulose; D010100:Oxygen