Bifunctional Na–Ru on gamma-alumina for CO 2 capture from air and conversion to CH 4 : impact of the regeneration method and support on monolithic contactors

Abstract

Dual functional material Ru–Na supported on a monolith enables efficient cyclic CO 2 capture from air and subsequent conversión to CH 4 , which contributes to reduce atmospheric CO 2 and to store renewable H 2 . Dual functional materials (DFMs) have the potential to improve the process of CO 2 capture and subsequent conversion to fuel. Materials consisting of Na and Ru supported on alumina have been investigated for cyclic direct CO 2 air capture and conversion to CH 4 . 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 CO 2 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.