RESEARCH / A0286
Engineering Support Surface to Form Metal Alloy via Atom Migration for Efficient CO Hydrogenation
Read the original paper · 10.1021/acscatal.5c03548 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 3. The phase and structure of the reduced and used FeCo catalysts were further characterized by XRD, XAS, and Mössbauer spectroscopy. (a) XRD patterns of the FeCo/TiN, FeCo/TiN−O-2, and FeCo/TiN−O-6 catalysts after pretreatment in high-purity H2 (99.999%). (b) In situ X- ray diffraction patterns of the reduction process of the FeCo/TiN−O-2 catalysts under H2. The catalysts were continuously heated from room temperature to 300 °C under H2 and were kept at 300 °C for several hours. (c,d) The X-ray absorption spectroscopy of the FeCo/TiN, FeCo/ TiN−O-2, and FeCo/TiN−O-6 catalysts after pretreatment in H2. (c) Co K-edge XANES spectra. (d) Co K-edge EXAFS spectra, as well as the Co references. (e) X-ray diffraction patterns of the catalysts after reaction (color code: Co−blue, Fe−yellow). (f) Mössbauer spectra of the FeCo/ TiN−O-2 catalyst after reaction.