Low-Temperature Decomposition of Nitrous Oxide on Cs/MexCo3-xO4 (Me: Ni or Mg, x=0-0.9) Oxides

Mixed oxides MexCo3-xO4 (Me: Ni or Mg, x = 0-0.9) with a spinel structure were synthesized by precipitation from Me, Co nitrate solutions using (NH4)(2)CO3 as the precipitating agent with subsequent modification of the dry precipitate with cesium by the Pechini method and calcination. The samples were studied by XRD, TPR, and TPD methods. Their catalytic activity was studied in the low-temperature (150-350 degrees C) nitrous oxide decomposition process. It was shown that an increase in the degree of substitution of cobalt (x) leads to a significant decrease in the degree of crystallization of the oxides, an increase in the specific surface area, and the formation of surface weakly bound oxygen species. The highest activity was shown by the catalysts with a degree of substitution x = 0.1, especially by the nickel-substituted sample, which contained the maximum amount of weakly bound surface oxygen species. The difference in the influence of Mg and Ni on the MexCo3-xO4 properties is discussed.

Automated summary

Mixed oxides MexCo3-xO4 (Me: Ni or Mg, x = 0-0.9) with a spinel structure were synthesized by precipitation and subsequent modification methods. The catalytic activity of the samples in the nitrous oxide decomposition process was studied. It was found that the degree of cobalt substitution greatly influenced the crystallization, surface area, and surface oxygen species of the oxides. The highest activity was observed in the catalyst with a degree of substitution of 0.1, particularly the nickel-substituted sample.