Fig. 2: Chemical structure of Ir–Wx/CeO2 catalysts.
From: Cascade catalysis on dual-atom iridium-tungsten catalysts for enhanced ammonia selective oxidation
XPS spectra for the Ir 4 f orbitals (a), W 4 f orbitals (b), Ce 3 d orbitals (c), and O 1 s orbitals (d) of Ir–Wx/CeO2 catalysts. H2-TPR profiles (e) and NH3-TPD profiles (f) of Ir–Wx/CeO2 catalysts.
