Zn, Al, Rh-mixed oxides derived from hydrotalcite-like compound and their catalytic properties for N 2O decomposition

Abstract

The catalytic decomposition of nitrous oxide was studied over Zn, Al, Rh-mixed oxides derived from hydrotalcite-like compounds (HTlc) as a precursor. The study showed that, when the Zn/Al atomic ratio was 3, the rate of ZnAlRh-HTlc for N 2O decomposition increased with Rh loading up to 1.4 wt% (4.55 × 10 4 μmol g −1 h −1 at 400°C), and levels off with further increase in Rh loading. Analogous behavior was found in the presence of NO 2 and water. In the presence of 0.5% water, the activity decreased with decreasing Zn/Al ratio, whereas the activity for N 2O decomposition in the presence of 0.1% NO 2 reached a maximum when the Zn/Al ratio was 3. The observed catalytic activities were comparable to those of the reported catalysts in the presence of NO 2 and water.