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Fundamental research on direct NO decomposition is still needed for the design of a sufficiently active, stable and selective catalyst. Co-based mixed oxides promoted by alkali metals are promising catalysts for direct NO decomposition, but which parameters play the key role in NO decomposition over mixed oxide catalysts? How do applied preparation conditions affect the obtained catalyst’s properties?

Cordierite monolith-supported and powder Fe-K/Al 2 O 3 catalysts were prepared and thoroughly characterized by bulk (XRD, Raman spectroscopy, XRF, ICP-OES, TPR) and surface (XPS, IR, N 2-BET, NO x-TPD, K-TPD) sensitive methods. The catalytic activity was tested in TPO (temperature programmed oxidation) of model soot.

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The beneficial effect (decrease of the half conversion temperature by 100°C) of potassium doping, in the range of 0-5 atoms/nm 2 , on N 2 O decomposition over Co 3 O 4 was analyzed by work function measurements and DFT calculations. The optimal potassium surface loading was found to be 1.8 atoms/nm 2 . The effect was explained in terms of electronic promotion gauged by lowering of the catalyst work function by 0.48 eV (for K 2 CO 3 precursor) and 0.44 eV (for KOH). The promotional effect is discussed in relation to the theoretical and experimental surface dipoles determined from Hirshfeld atomic charges and geometry of the postulated potassium adspecies and from the Topping model, respectively.

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