Abstract
In this paper, a series of zinc cobaltite catalysts with the general formula Znx-Co1-xCo2O4 (x = 0.25, 0.50, 0.75 and 1.0) has been prepared using the co-precipitation method. Thermal analyzes (TGA and DTA) were used to follow up the thermal events accompanying the heat treatment of the parent mixture. Based on these results, the various parent mixtures were calcined at 500℃. The obtained solid catalysts were characterized by using XRD, FT-IR and N2-adsorption. The catalytic decomposition of N2O to N2 and O2 was carried out on the zinc-cobaltite catalysts. It was found that partial replacement of Co2+ by Zn2+ in Co3O4 spinel oxide led to a significant improvement in their N2O decomposition activity. Moreover, the catalytic activity was found to be depended on the calcination temperature utilized.
Highlights
In the last two decades, there has been considerable increased concern about the harmful effects of N2O on our atmosphere
It was found that partial replacement of Co2+ by Zn2+ in Co3O4 spinel oxide led to a significant improvement in their N2O decomposition activity
In agreement with the reported work on Cu0.75Co0.25Co2O4 [32], Ni0.75Co0.25Co2O4 [31] and bare Co3O4 [37] [38] [39] [40] [41], the final WL could be assigned to the decomposition of the spinel oxide
Summary
In the last two decades, there has been considerable increased concern about the harmful effects of N2O on our atmosphere. Russo et al [24] studied N2O decomposition over a series of spinel oxide catalysts (chromites, ferrites and cobalities) being prepared by the solution combustion route Their results indicated that the catalytic activity of the prepared spinel oxides essentially depended mostly on the B site metal (Cr, Fe and Co). Shen et al [28] presented a detailed study on N2O decomposition over different oxide supported Co3O4 spinel catalysts prepared via the co-precipitation method and found that Co3O4/MgO with cobalt loading of 15% showed the best activity, where a 100% conversion was obtained at temperatures higher than 425 ̊C. We have reported the effect of transition metal exchange as well as the calcination temperature on the N2O decomposition activity of NixCo1−xCo2O4 [31] and CuxCo1−xCo2O4 [32] catalysts. The experiments will be extended to check the influence of increasing the calcination temperature (up to 1000 ̊C) on the activity of the best catalyst in this series
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