Application, performance and mechanism of high-entropy catalysts for degradation of heterocyclic compounds

Abstract

High-entropy catalysts have attracted great interest due to their unique microstructures, excellent thermal stability and catalytic activity for various reactions. In this study, three high-entropy catalysts were prepared by doping CeO2 with transition metal oxides that have full redox cycle capability. Their performance for the ultra-fast catalytic oxidation degradation of heterocyclic compounds was investigated. Compared with the reaction without catalysts, the high-entropy catalysts could significantly shorten the residence time and improve the reaction efficiency, indicating that they could promote the oxidation reaction. Under the conditions of reaction temperature (T) = 390 °C and oxidation coefficient (OC) = 2.90, the chemical oxygen demand (COD) removal rate of the high-entropy oxide catalyst (AlTiCeFeCu)Ox@TA reached 94.52 % after 8 min of reaction. Moreover, characterization analysis revealed that the high-entropy catalysts prepared by doping appropriate transition metal oxides exhibited excellent catalytic activity and stability, providing new insights for the research of efficient catalysts in the ultra-fast oxidation system.