Abstract A series of three-dimensionally ordered macro-mesoporous (3DOMM) La1−xCaxFeO3 (x = 0–0.3) perovskite-type oxides were designed and successfully fabricated for the first time via a dual-template method. In which, PMMA and Brij-56 were employed as the hard template and soft template, respectively. It is found that 3DOMM La1−xCaxFeO3 exhibits abundant wormlike mesoporous channels about 3 nm in diameter on macroporous skeleton walls. The excellent catalytic activity of soot combustion benefits from not only the well-designed hierarchical porous structure of catalyst, but also the redox electron pair of Fe3+/Fe4+ induced by the doping of low-valent alkaline earth metal Ca to A-site of LaFeO3. 3DOMM La0.8Ca0.2FeO3 exhibits superior catalytic performance for soot combustion, which shows T50 of 396 °C. It is 189 °C lower than that without catalyst. A combination of structure and composition in the design of catalyst can be widely extended to other catalytic systems.

中文翻译：

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通过双模板法制备具有大介孔结构的 La1−Ca FeO3 钙钛矿型氧化物以实现高效烟尘燃烧

摘要 通过双模板法首次设计并成功制备了一系列三维有序的大介孔（3DOMM）La1-xCaxFeO3（x = 0-0.3）钙钛矿型氧化物。其中，分别采用 PMMA 和 Brij-56 作为硬模板和软模板。发现 3DOMM La1−xCaxFeO3 在大孔骨架壁上表现出丰富的直径约 3 nm 的蠕虫状介孔通道。烟尘燃烧的优异催化活性不仅得益于精心设计的催化剂分级多孔结构，还得益于低价碱土金属 Ca 掺杂到 LaFeO3 的 A 位所诱导的 Fe3+/Fe4+ 氧化还原电子对。3DOMM La0.8Ca0.2FeO3 对烟尘燃烧表现出优异的催化性能，T50 为 396 °C。它比没有催化剂的温度低189°C。催化剂设计中结构和组成的组合可以广泛扩展到其他催化体系。