RESEARCH / A0457
Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi-Doping and Dynamic Trace CO2 Co-feeding during Propane Dehydrogenation
Read the original paper · 10.1002/anie.202415295 ↗
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 2. (a b) High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and STEM-EDS mapping image of 10CoBi/Al2O3 catalyst. (c) Fourier-transformed Co K-edge XANES spectra (R space) for various CoBi ratios. (d) Normalized XANES spectra of Co K-edge for different CoBi ratio samples. (e) XPS spectra of Co 2p for various samples. (f) XPS spectra of Bi 4f for various samples.
Figure 6. (a) In situ TG spectra of spent CoBi/Al2O3 catalysts with varying CoBi ratios under a 1% CO2 atmosphere at 600°C. The reaction conditions included a temperature of 600°C, total flow rate of 100 mL·min 1, and a catalyst mass of 25 mg. (b) In situ Raman spectra recorded for spent 10CoBi/Al2O3 catalysts at 600°C under a 1% CO2 (1 ml/min) and 40% C3H8 (C3H8:Ar=2:3; total flow=10 ml/min) atmosphere for different durations. (c) In situ XANES spectra of the Co K-edge of the 10CoBi/Al2O3 catalyst under various gas atmospheres. (d) The carbon deposition rate of 10CoBi/Al2O3 as a function of propane partial pressure.