Fig. 7.

Schematic drawing of the structure of the active catalysts based on TEM and XRD analysis. a Co₁Mn₃–Na₂S consists of metallic Co nanoparticles of ~10 nm dispersed on MnO support and b Co₃Mn₁–Na₂O consists of Co₂C nanoprisms of ~10–50 nm from Zhong et al⁸. Whereas the former catalyst restricts WGS and thus CO₂ formation, the latter leads to large amounts of CO₂