Activity and Stability of Cu‐Based Spinel‐Type Complex Oxides for Diesel Soot Combustion

Abstract

Abstract A series of Cu‐based spinel‐type complex oxides (CuB 2 O 4 , B=Fe, Mn, Co and Cr) was synthesized via sol‐gel method for soot combustion. The soot combustion was accelerated in the presence of all prepared CuB 2 O 4 catalysts compared to that without catalyst. The CuCo 2 O 4 catalyst exhibited the best catalytic activity, with the soot combustion temperatures T 10 , T 50 and T 90 of 480 °C, 539 °C and 569 °C, respectively. XRD patterns showed that the catalysts were mainly in spinel phase. The H 2 ‐TPR, XPS and O 2 ‐TPD characterizations revealed that the interactions between cobalt and copper led to higher content of the Cu + species, better redox properties and abundant adsorbed oxygen species than the other three catalysts, which contributed to soot combustion. In addition, the catalytic activity of the CuCo 2 O 4 catalysts on soot combustion were facilitated in the presence of NO, while water vapor inhibited the catalytic activity. Besides, the cycle tests clarified that CuCo 2 O 4 catalyst exhibited good stability.