3D architectures porous epsilon-type manganese dioxide (ɛ-MnO₂) microcubes (PEMD) are successfully prepared by a glucose-urea-assisted hydrothermal synthesis of MnCO₃-carbon composites followed by annealing. It turns out that urea essentially assists in building the cubic shape while glucose plays a crucial role to form carbon inside the microcrystals, which are latterly removed by annealing to generate the porous structure. As a result, ɛ-MnO₂ materials possessing extraordinary features including the high porosity, reducibility, lattice oxygen reactivity and Mn⁴⁺ fraction, are feasible tailored. These unique properties, all together, significantly improve the catalytic performances of complete oxidation of toluene. Thus, it is found that the optimal catalyst (manganese-glucose-urea ratio of 6-2-6) synthesized at 180 °C exhibits an excellent activity for the complete oxidation of toluene (T₉₀ = 243 °C, lower 10 °C than that of pristine ɛ-MnO₂) and stability up to 10 hours.

通过葡萄糖-尿素辅助水热合成MnCO _3-碳复合材料，然后进行退火，成功地制备了3D结构的多孔ε型二氧化锰（man -MnO ₂）微立方体。事实证明，尿素基本上有助于建立立方体形状，而葡萄糖起着至关重要的作用，在微晶内部形成碳，然后通过退火将其除去以生成多孔结构。其结果是，ɛ-的MnO _2种材料具有非凡特性，包括高孔隙率，还原性，晶格氧的反应性和Mn ⁴⁺分数，都可以量身定制。这些独特的性质共同显着提高了甲苯完全氧化的催化性能。因此，发现在180°C合成的最佳催化剂（锰-葡萄糖-尿素比为6-2-6）在甲苯的完全氧化中表现出优异的活性（T ₉₀  = 243°C，低于10°C比原始的Mn-MnO ₂）和稳定性长达10小时。