A series of novel Fe-Mn mixed oxide hollow microspheres are synthesized by a hard template approach and used for catalytic oxidation of 1,2-dichlorobenzene (DCB). The obtained materials are characterized by FAAS, XRD, N₂ sorption, SEM, TEM, in situ FT-IR and XPS techniques. The results show that the proportions of Fe/Mn can make great influence on the physicochemical properties of Fe-Mn mixed oxides, and thus, affecting their catalytic performances in DCB oxidation. In particular, the FeMn20 catalyst (molar ratio Mn/(Fe+Mn) ≈ 20%) exhibits the highest catalytic performance (i.e., high catalytic activity and CO₂ selectivity, long-term stability and good water-resistant ability). In situ FT-IR measurements and XPS results reveal that the FeMn20 catalyst shows almost no obvious carbon deposition after long-term testing. The excellent catalytic performance of FeMn20 catalyst is attributed to the combined effects of several factors such as small crystallite size, hierarchical porous structure and high surface active oxygen concentration. It is reasonable for us to believe that such Fe-Mn mixed oxide hollow microspheres represent a very promising catalyst system for total catalytic oxidation of chlorinated volatile organic pollutants.

通过硬模板法合成了一系列新颖的Fe-Mn混合氧化物空心微球，并用于催化氧化1,2-二氯苯（DCB）。通过FAAS，XRD，N ₂吸附，SEM，TEM，原位FT-IR和XPS技术对所得材料进行表征。结果表明，Fe / Mn的比例对Fe-Mn混合氧化物的理化性质有较大影响，从而影响其在DCB氧化中的催化性能。特别地，FeMn20催化剂（摩尔比Mn /（Fe + Mn）≈20％）表现出最高的催化性能（即，高催化活性和CO ₂选择性，长期稳定性和良好的耐水性）。原位FT-IR测量和XPS结果表明，经过长期测试，FeMn20催化剂几乎没有显示出明显的碳沉积。FeMn20催化剂的优异催化性能归因于多种因素的综合作用，例如小晶粒尺寸，分层多孔结构和高表面活性氧浓度。我们有理由相信，这种Fe-Mn混合氧化物空心微球代表了对氯化挥发性有机污染物进行全催化氧化的非常有前途的催化剂体系。