CO₂ sorbents are considered key components of the direct air capture (DAC) process. Various types of amines are widely applied for CO₂ capture from the atmosphere. Their activities and efficiencies depend on various factors including their support material, operating conditions, and environment. Statistical data analysis is done to provide more insights into the performance of these amines for DAC.

Abstract

Available data on amine-based sorbents used for the direct air capture (DAC) process were gathered and analyzed to identify the correlations between various aspects of these sorbents and the operating conditions they are used in. It is demonstrated that a moderately high temperature (∼ 50 °C) can help with higher CO₂ capture capacity. The effect of sorbent preparation method on its activity and stability was studied. Also, the influence of amine groups and support choice on amine efficiency and CO₂ capture capacity was discussed. The DAC process conditions proved to play a major role in determining the optimal sorbent. An outlook for characteristics to be sought for in future DAC sorbents for CO₂ removal is proposed.