Preparation of CeMnO Catalysts with Strong Mn-Ce Synergistic Effect for Catalytic Oxidation of Toluene.

A series of Ce-doped α-MnO catalysts (CeMnO, x = 0.04, 0.07, 0.10) were synthesized by a simple in situ hydrothermal method. It was confirmed by characterization methods such as XRD, Raman, N adsorption-desorption and SEM confirmed that the introduction of Ce significantly regulated the microstructure of α-MnO, specifically manifested as the reduction in grain size, the increase in defect sites, the increase in Mn-O bond length and altered morphological structure. H-TPR, O-TPD and XPS analyses further revealed the strong interaction between Mn and Ce, accompanied by significant electron transfer (Ce + Mn → Ce + Mn), thereby promoting the formation of Mn species. In the test of toluene catalytic oxidation performance, CMnO exhibited the most excellent catalytic activity (T = 280 °C), while also having good thermal stability and water resistance. Furthermore, the degradation pathways of toluene were analyzed by TD-GC-MS technology: Toluene → Benzene → Benzaldehyde → Maleic anhydride → CO and HO.