Bifunctional Na–Ru on gamma-alumina for CO2 capture from air and conversion to CH4: impact of the regeneration method and support on monolithic contactors†
Abstract
Dual functional materials (DFMs) have the potential to improve the process of CO2 capture and subsequent conversion to fuel. Materials consisting of Na and Ru supported on alumina have been investigated for cyclic direct CO2 air capture and conversion to CH4. We have studied the regeneration conditions, specifically the target temperature and gas composition (inert or hydrogen-containing gas) during heating. The effect of air humidity and Na loading on the effectiveness of CO2 capture has also been assessed. Finally, the DFMs have been successfully implemented as structured contactors with a low pressure drop, which is an unavoidable requirement for practical application.
Keywords: Dual functional materials; Direct air CO2 capture; Methanation; Monoliths.