Iron Oxide as a Catalyst for Nitroarene Hydrogenation: Important Role of Oxygen Vacancies

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• 作者：Hongling Niu ; Jinhui Lu ; JiaJia Song ; Lun Pan ; Xiangwen Zhang ; Li Wang ; Ji-Jun Zou
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：55
• 期：31
• 页码：8527-8533
• 全文大小：575K
• 年卷期：0
• ISSN：1520-5045

文摘

Heterogeneous catalytic hydrogenation of nitroarenes is one of the most important chemical transformations, and exploring earth-abundant catalysts is very attractive for application. Herein, we studied the catalytic activity of several iron oxide catalysts with similar structure and surface area. It is found that γ-Fe₂O₃, α-Fe₂O₃, and FeO show obvious but a little limited activity, but the activity of the used catalyst is increased in the second run, especially for γ-Fe₂O₃. Characterization shows that Fe₂O₃ is partly reduced with many oxygen vacancies produced on the surface, which accounts for the high hydrogenation activity. Finally, Fe₃O₄ exhibits activity significantly higher than Fe₂O₃ and FeO, and 100% selectivity in the hydrogenation of nitroarenes to anilines. Also, Fe₃O₄ is easy to separate by a magnetic field and shows excellent recycling stability.