Abstract
The effect of potassium promotion on deN 2O activity of various 3d electron spinels (Mn 3O 4, Fe 3O 4, Co 3O 4) was investigated by TPSR in conjunction with parallel work function measurements. The results were interpreted in terms of a surface dipole model (K δ+ –O surf δ− ) supported by DFT molecular modelling. The substantial enhancement of deN 2O reactivity of Co 3O 4 and Mn 3O 4 upon K addition (decrease of Δ T 50% by 150 °C) was observed, whereas for Fe 3O 4 the promotional effect was unexpectedly small. The maximum deN 2O activity was found for potassium surface coverage of 2, 6, 8 K atoms/nm 2 for cobalt, iron and manganese spinels, respectively. In each case the optimal level of doping was found for the minimum of the measured work function indicating that this parameter can be use for optimization of the catalyst deN 2O reactivity.
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