Abstract
A series of Ce-doped α-MnO(2) catalysts (Ce(X)Mn(1-X)O(2), 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(2) adsorption-desorption and SEM confirmed that the introduction of Ce significantly regulated the microstructure of α-MnO(2), 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(2)-TPR, O(2)-TPD and XPS analyses further revealed the strong interaction between Mn and Ce, accompanied by significant electron transfer (Ce(3+) + Mn(4+) → Ce(4+) + Mn(3+)), thereby promoting the formation of Mn(3+) species. In the test of toluene catalytic oxidation performance, C(e0.07)Mn(0.93)O(2) exhibited the most excellent catalytic activity (T(100) = 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(2) and H(2)O.