To explore the surface doping effects of metal oxides possessing redox (Cr, Co, Mn) or acidic (In, Bi) properties on SnO₂, SnO₂ doped by different metal oxides has been designed. All the doping metal oxides disperse finely on the SnO₂ support surface, which can improves the reaction activity, obeying the order of 1%Mn/SnO₂ > 1%Co/SnO₂ > 1%Cr/SnO₂ > 1%Bi/SnO₂ > 1%In/SnO₂ > SnO₂. By modifying SnO₂ surface with Cr, Co and Mn oxides, both the active surface oxygen (O₂⁻ and O₂²⁻) and acid sites quantities have been significantly improved, thus resulting in remarkable activity increment. Whereas, by modifying SnO₂ surface with In and Bi oxides, only the surface acid sites amount has been improved, hence having limited activity improvement effect. 1%Mn/SnO₂ catalyst possesses considerable amount of both types of active sites, thus showing the optimal toluene deep oxidation activity in all the catalysts.

为了探索具有氧化还原（Cr，Co，Mn）或酸性（In，Bi）性质的金属氧化物对SnO ₂的表面掺杂效果，设计了不同金属氧化物掺杂的SnO ₂。所有的掺杂金属氧化物都可以很好地分散在SnO ₂载体表面上，从而可以提高反应活性，遵循1％Mn / SnO ₂ > 1％Co / SnO ₂ > 1％Cr / SnO ₂ > 1％Bi / SnO ₂＞ 1％In / SnO ₂＞ SnO ₂。通过修改的SnO ₂以Cr，Co和Mn的氧化物，两种活性表面氧（O表面₂ ^-和O ₂ ^2-）和酸性部位的数量已得到显着改善，从而导致显着的活性增加。然而，通过用In和Bi氧化物修饰SnO ₂表面，仅表面酸性部位的量得到了改善，因此活性改善效果有限。1％Mn / SnO ₂催化剂具有大量的两种类型的活性位，因此在所有催化剂中均显示出最佳的甲苯深度氧化活性。