We report here a facile approach for the construction of 3D Fe-doped γ-Al₂O₃. In this method, by the addition of urea and citric acid during synthesis, hollow spheres with a multi-modal porous structure can be successfully produced. The obtained Fe-doped γ-Al₂O₃ microspheres are about 0.8–1.5 μm in diameter with a shell thickness of 200 nm. Compared with γ-Al₂O₃, the Fe-doped γ-Al₂O₃ catalysts exhibit enhanced activity in the selective oxidation of H₂S. According to the results of systematic studies, it is inferred that both Lewis acid sites and chemically adsorbed oxygen at oxygen vacancies have a great influence on catalytic activity. In addition, the nature of active sites and the reaction mechanism for H₂S selective oxidation over these catalysts are disclosed.

中文翻译：

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掺杂Fe的γ-Al系₂ ö _3个为增强的氧化脱硫多孔中空微球体：容易制造和反应机理

我们在这里报告的3D Fe掺杂的γ-Al建设一个浅显的方法₂ Ø ₃。用这种方法，通过在合成过程中加入尿素和柠檬酸，可以成功地生产出具有多峰多孔结构的空心球。将所得到的Fe掺杂的γ-Al ₂ ö ₃微球是约0.8-1.5微米的直径为200nm的壳厚度。与γ-Al系相比₂ Ó ₃，Fe掺杂的γ-Al _2种ö ₃催化剂显示在H选择性氧化活性提高₂S.根据系统研究的结果，可以推断出路易斯酸位和氧空位处的化学吸附氧都对催化活性有很大的影响。此外，公开了活性位点的性质和在这些催化剂上进行H ₂ S选择性氧化的反应机理。