In the present work, we report a facile oxalate-derived hydrothermal method to fabricate α-, β- and δ-MnO₂ catalysts with hierarchically porous structure and study the phase-dependent behavior for selective oxidation of H₂S over MnO₂ catalysts. It was disclosed that the oxygen vacancy, reducibility and acid property of MnO₂ are essentially determined by the crystalline phase. Systematic experiments demonstrate that δ-MnO₂ is superior in active oxygen species, activation energy and H₂S adsorption content among the prepared catalysts. As a consequence, δ-MnO₂ nanosphere with a hierarchically porous structure shows high activity and stability with almost 100% sulfur selectivity and H₂S conversion at 210 °C, better than majority of reported Mn-based materials. Meanwhile, hierarchically porous structure of δ-MnO₂ nanosphere alleviates the generation of by-product SO₂ and sulphate, promoting the adoptability of Mn-based catalysts in industrial applications.

在目前的工作中，我们报告一个浅显草酸衍生的水热法来制造α-，β-和δ-MnO的_2层与分级多孔结构的催化剂和研究用于H的选择性氧化的相依赖行为₂以上的MnO小号₂催化剂。公开了MnO ₂的氧空位，还原性和酸性质基本上由结晶相决定。系统的实验结果表明，δ-的MnO ₂是在活性氧种，活化能和H优越₂所制备的催化剂中吸附小号内容。因此，δ-的MnO ₂具有分层多孔结构的纳米球表现出高活性和稳定性，在210°C时具有几乎100％的硫选择性和H ₂ S转化率，优于大多数报道的Mn基材料。同时，δ-的MnO分级多孔结构₂纳米球减轻的副产品SO产生₂和硫酸盐，促进在工业应用中Mn基催化剂的adoptability。