Catalytic activity of perovskite oxides as LaMnO_3+δ is greatly limited by their low surface area and deficient active site density though they are thought to be one category of desired candidates for noble metal-based catalysts. Here, a robust three dimensional ordered macroporous (3DOM) γ-MnO₂/LaMnO_3.15 (Mn/3DLM) was in situ fabricated by the strategy of selectively dealloyed surface La cations. Mn/3DLM displayed excellent activity with 90% of chlorobenzene destructed at 207 °C (apparent activation energy of 45.4 kJ/mol), obviously lower than those of γ-MnO₂ (244 °C; 51.9 kJ/mol) and bulk LaMnO_3.15 (311 °C; 70.2 kJ/mol) owing to large surface area, excellent reducibility, and improved surface active oxygen concentration. Nucleophilic substitution was the main process for active oxygen attacking, while electrophilic substitution mainly contributed to chlorinated byproducts formation. Remarkably, reaction byproducts as phenol, o-dichlorobenzene, trichloroethylene, and bichloroethylene over Mn/3DLM can be efficiently inhibited during the long-term operations via weakened the electrophilic substitution effect.

钙钛矿氧化物作为LaMnO _{3 +δ的}催化活性受到其低表面积和不足的活性位点密度的极大限制，尽管它们被认为是贵金属基催化剂的理想候选之一。在这里，一个强大的三维有序大孔（3DOM）γ-MnO的₂ /的LaMnO _3.15（MN / 3DLM）是原位制作通过选择性脱合金表面的La阳离子的策略。的Mn / 3DLM显示极好的活性用氯苯的90％在207℃破坏（45.4千焦/摩尔表观活化能），明显高于低γ-MnO的₂（244℃; 51.9千焦/摩尔）和主体的LaMnO _3.15（311°C; 70.2 kJ / mol）的原因是表面积大，还原性极好并且表面活性氧浓度提高。亲核取代是攻击活性氧的主要过程，而亲电子取代则主要促进了氯化副产物的形成。值得注意的是，在长期操作期间，通过削弱亲电取代作用，可以有效地抑制Mn / 3DLM上的苯酚，邻二氯苯，三氯乙烯和二氯乙烯等反应副产物。