Fig. 3: Structural and electronic elucidation of nickel-promoted In2O3 catalysts.
From: Nanostructure of nickel-promoted indium oxide catalysts drives selectivity in CO2 hydrogenation
a STEM-EDX maps of Ni-In2O3 catalysts containing 1–20 wt.% Ni in fresh and used forms. b HRTEM images, with phases identified by fringe analysis and features of interest indicated, and c k-weighted Ni K-edge XANES, with spectra of NiO and metallic nickel serving as references, for the same used catalysts. d XRD patterns collected in monochromatic light and e EXAFS with model fit and an indication of neighbors’ number along a specific scattering path for selected fresh and used samples. f Percentage of In2O3 surface not covered by nickel as a function of the nominal nickel content, determined by volumetric CO2 chemisorption. The qualitative trend respective to nanoparticle formation and the coverage predicted by DFT is indicated. a.u. = arbitrary units.
