The performance of manganese-based catalysts with Ce0.65Zr0.35O2 as support for catalytic oxidation of toluene

Abstract Mesoporous Ce 0.65 Zr 0.35 O 2 composites are synthesized by co-precipitation method and a series of novel MnO x /Ce 0.65 Zr 0.35 O 2 monolithic catalysts with different content of manganese oxides are prepared for toluene catalytic oxidation. The results show that the catalytic activity of Ce 0.65 Zr 0.35 O 2 is promoted by introduction of manganese and influenced remarkably by the amount of MnO x . In particular, the catalyst with 15 wt.% MnO x loading performs best activity in view of the lowest complete conversion temperature of 250 °C at a GHSV of 12000 h −1 . According to the characterizations of N 2 adsorption-desorption, XRD, SEM-EDX, H 2 -TPR, O 2 -TPD and XPS analyses, the superior catalytic activity could be attributed to the well-dispersed MnO x species, good low-temperature redox property, more Mn 4+ species and more available surface and lattice oxygen species. Additionally, the optimized catalyst shows high stability during the thermal aging experiment and long-term testing experiment, and it also shows a good activity under the condition of high gas hourly space velocity, which presents a well application prospect.