How solid material captures CO2 from biogas

Worldwide efforts are being made to limit CO2 emissions, and one of the instruments to achieve this is CO2 capture. The techniques used to do this are mainly based on liquid processes. The most widely used method is to capture the CO2 from the flue gas and channelling it into a liquid. The flue gas or biogas is passed through long pipes to a large quantity of liquid – typically water – which contains various additives that help absorb the CO2 in the liquid. Once the CO2 has been absorbed in the liquid, it has been captured. This is an efficient method, but also highly energy-consuming. At Technical University of Denmark (DTU), recently developed a new and more energy-efficient method that can capture the CO2 in a solid material and upgrade it to a cleaner product, which can subsequently be used to produce, for example, fuels.

(Innovative Materials 2021 Volume 6)