Kinetic study of CO₂ adsorption under Direct Air Capture conditions using frequency response method

Direct Air Capture is a key technology for managing the atmospheric CO₂ concentration and achieving global climate goals. Over the past decade, there has been vast research interest in developing adsorption materials for low-temperature DAC. Most of these studies feature equilibrium data on the adsorption capacity. However, information on the mass transfer and adsorption kinetics is often critically missing, while this is of vital importance for device and process design. One material that has emerged as a benchmark for temperature-vacuum-swing DAC is the commercially available sorbent Lewatit VP OC 1065 by Lanxess. Recent advances include studies on CO₂/H₂O co-adsorption, adsorption mechanisms, and swelling. In this project, we are developing a set-up and analysis for measurement of CO₂ and H₂O uptake kinetics on this material using a frequency response method. This method can represent a valuable tool for material characterisation, equipment design and process evaluation in the field of DAC.

This work is supported by the TU Delft Climate Action Programme Seed Fund.