Fig. 5.

Electron microscopy images of spent Co₁Mn₃–Na₂S. Reaction conditions: 240–280 °C, 10 bar, and H₂/CO = 2. a bright-field TEM image with a scale bar corresponding to 100 nm, and blue arrows to point out the presence of wax, b dark-field TEM images with a scale bar corresponding to 50 nm, c particle size distribution of Co nanoparticles supported on MnO, and d–f STEM-EDX maps of Co and Mn, and the scale bars correspond to 200 nm