Analysis of direct capture of CO2 from ambient air via steam-assisted temperature–vacuum swing adsorption

Valentina Stampi-Bombelli, Mijndert van der Spek, Marco Mazzotti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)
239 Downloads (Pure)


In this work, direct air capture (DAC) via adsorption is studied through the design and analysis of two temperature–vacuum swing adsorption (TVSA) cycles. In the first part, a novel way of describing the adsorption of CO2 in presence of water vapor is proposed for co-adsorption kinetic and thermodynamic data gathered from the literature. Secondly, two TVSA cycle designs are proposed: one with a desorption step via external heating, and one with a steam purge. A schematic method for the determination of the cycle step times is proposed and a parametric study on the operating conditions is performed via cycle simulations using a detailed, first principles model. Finally, the two cycles are compared in terms of CO2 production and energy consumption. The parametric study on the desorption time shows that there is a desorption time yielding the highest CO2 production at low energy consumptions. Low evacuation pressures are necessary to reach high CO2 production, but higher evacuation pressures show to be always favorable in terms of specific electrical energy requirements. A steam purge requires an additional thermal energy cost, but it not only allows decreasing the specific electrical energy consumptions, it also enhances CO2 desorption kinetics and allows reaching higher CO2 productions at milder evacuation pressures. The results of this work present the possibility to directly relate the availability of power and heat to the design of the cycle.

Original languageEnglish
Pages (from-to)1183-1197
Number of pages15
Issue number7
Early online date11 Aug 2020
Publication statusPublished - Oct 2020


  • Adsorption
  • Carbon capture
  • Direct air capture
  • Negative emissions technology
  • S-TVSA
  • Simulations

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces


Dive into the research topics of 'Analysis of direct capture of CO2 from ambient air via steam-assisted temperature–vacuum swing adsorption'. Together they form a unique fingerprint.

Cite this