Abstract
A series of potassium or cesium doped Zn0.4Co2.6O4|Al2O3 catalysts with different alkali loadings were prepared, characterized with respect to chemical composition (XRF), structure (XRD, RS) morphology (TEM), and the alkali promoter thermal stability. A strong beneficial effect on the deN2O activity of the Zn0.4Co2.6O4|Al2O3 catalyst (decrease in the T50% by about 80 °C) was observed for both promoters at different surface coverages. It was found that in comparison to a rather narrow range of optimal cesium loading (0.5–2 atoms/nm2) a comparable promotional effect of potassium doping was observed for a slightly wider surface concentrations (0.5–3 atoms/nm2). Such difference was attributed to surface dispersion of potassium over the alumina support and the spinel active phase, while cesium was found to be located mainly on the spinel phase. For practical applications, the superiority of potassium over cesium consist in fact that a similar beneficial effect is associated with much higher thermal stability in the temperature range of the catalyst deN2O operation and lower price of the promoter precursor.
Highlights
Nitrous oxide is commonly recognized as an important greenhouse gas, emitted from natural and anthropogenic sources
The catalytic performance of Co3O4 can be modified by bulk doping with transition metal cations [5,6,7,8,9,10] and surface doping with alkali dopants (Na, K, Cs) [3, 8, 11,12,13]
In the particular case of potassium, it has been found that the promotional effect strongly depends on the precursor nature (K2CO3, KNO3, CH3COOK, KOH), and the highest activity was observed for K2CO3
Summary
Nitrous oxide is commonly recognized as an important greenhouse gas, emitted from natural (nitrogen cycles) and anthropogenic (mainly nitric and adipic acid production) sources. Abstract A series of potassium or cesium doped Zn0.4Co2.6O4|Al2O3 catalysts with different alkali loadings were prepared, characterized with respect to chemical composition (XRF), structure (XRD, RS) morphology (TEM), and the alkali promoter thermal stability.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
