Enhancement of Cs on Co<sub>3</sub>O<sub>4</sub> for N<sub>2</sub>O Catalytic Decomposition: N<sub>2</sub>O Activation and O<sub>2</sub> Desorption
Feilin Zhao, Dongdong Wang, Xing Li, Yimeng Yin, Chizhong Wang, Lei Qiu, Jie Yu, Huazhen Chang
Abstract
In this work, a series of cesium (Cs) modified metal oxide (Co3O4, CuO, Mn2O3, and NiO) catalysts were synthesized and investigated for N2O catalytic decomposition. More than 95% N2O conversion was obtained with the Cs-supported Co3O4 (Cs/Co) catalyst at 300 °C, but only a slight increase or even suppression was obtained with the other catalysts. The activation energy (Ea) varied significantly for Cs modified catalysts. It was found that both of N2O adsorption–dissociation (from N2O-TPD) and O2 desorption capacities (from O2-TPD) were highly correlated with the N2O decomposition activity. Highly optimized N2O activation and O2 desorption capacities contributed to the boosting performance of the Cs/Co catalyst. Moreover, the improved electron transfer property inferred from H2-temperature-programmed reduction and X-ray photoelectron spectroscopy was likely to facilitate the reaction processes and promote N2O catalytic decomposition performance.