In this paper, nitrous oxide decomposition over a series of MCO₃-Co₃O₄ (M = Ca, Sr, Ba) catalysts having M/Co ratios of 0.1-0.4 has been studied. The various catalysts were characterized using thermal (TGA, DTA), XRD, IR and N₂ sorption techniques. N₂O decomposition activity was found to be dependent on the type of the alkaline earth cation, the M/Co ratio, cobalt oxide crystallites sizes, and the calcination temperature.

In this paper, nitrous oxide decomposition over a series of MCO₃-Co₃O₄ (M = Ca, Sr, Ba) catalysts having M/Co ratios of 0.1-0.4 has been studied. The various catalysts were characterized using thermal (TGA, DTA), XRD, IR and N₂ sorption techniques. N₂O decomposition activity was found to be dependent on the type of the alkaline earth cation, the M/Co ratio, cobalt oxide crystallites sizes, and the calcination temperature.

A series of NixCo1-xCo2O4 (0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by thermal analysis. The catalysts were calcined at 500 °C for 3 h and characterized by powder X-ray diffraction, Fourier transform infrared, and N2 adsorption-desorption. Nickel cobaltite spinel was formed in the solid state reaction between NiO and Co3O4. The N2O decomposition measurement revealed significant increase in the activity of Co3O4 spinel oxide catalyst with the partial replacement of Co2+ by Ni2+. The activity of this series of catalysts was controlled by the degree of Co2+ substitution by Ni2+, spinel crystallite size, catalyst surface area, presence of residual K+, and calcination temperature.

A series of NixCo1-xCo2O4 (0 ≤ x ≤ 1) spinel catalysts were prepared by the co-precipitation method and used for direct N2O decomposition. The decomposition pathway of the parent precipitates was characterized by thermal analysis. The catalysts were calcined at 500 °C for 3 h and characterized by powder X-ray diffraction, Fourier transform infrared, and N2 adsorption-desorption. Nickel cobaltite spinel was formed in the solid state reaction between NiO and Co3O4. The N2O decomposition measurement revealed significant increase in the activity of Co3O4 spinel oxide catalyst with the partial replacement of Co2+ by Ni2+. The activity of this series of catalysts was controlled by the degree of Co2+ substitution by Ni2+, spinel crystallite size, catalyst surface area, presence of residual K+, and calcination temperature.

In this investigation, the direct catalytic decomposition of N2O into N2 and O2 was performed over CuxCo1−xCo2O4 (x = 0.0 ≤ x ≤ 1.0) spinel-oxide catalysts. These catalysts were synthesized by the co-precipitation method followed by calcination at 500 °C. The activity results demonstrated that the partial replacement of Co2+ by Cu2+ in the spinel-oxide Co3O4 led to a significant improvement in the N2O decomposition. Additionally, the activity was found to be controlled by other parameters, including the size of the spinel crystallites, the surface area of the catalysts, and the presence of residual potassium ions.

In this investigation, the direct catalytic decomposition of N2O into N2 and O2 was performed over CuxCo1−xCo2O4 (x = 0.0 ≤ x ≤ 1.0) spinel-oxide catalysts. These catalysts were synthesized by the co-precipitation method followed by calcination at 500 °C. The activity results demonstrated that the partial replacement of Co2+ by Cu2+ in the spinel-oxide Co3O4 led to a significant improvement in the N2O decomposition. Additionally, the activity was found to be controlled by other parameters, including the size of the spinel crystallites, the surface area of the catalysts, and the presence of residual potassium ions.

In this paper, a series of zinc cobaltite catalysts with the general formula
ZnxCo1−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˚C. 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.

In this paper, a series of zinc cobaltite catalysts with the general formula
ZnxCo1−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˚C. 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.

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