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Catalytic Performance of MnOx Nanorods in Aerobic Oxidation of Benzyl Alcohol
Jing Yang1, Qing Hua1,2,3, Su-jie Chang1,2,3, Xian-qin Yu1, Yun-sheng Ma*1, Wei-xin Huang*1,2,3
1.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, China;3.Hefei National Laboratory for Phys
Abstract:
Various manganese oxide nanorods with similar one-dimensional morphology were prepared by calcination of MnOOH nanorods under different gas atmosphere and at different temper-atures, which were synthesized by a hydrothermal route. The morphology and structure of MnOx catalysts were characterized by a series of techniques including X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and tempera-ture programmed reduction (TPR). The catalytic activities of the prepared MnOx nanorods were tested in the liquid phase aerobic oxidation of benzyl alcohol, which follow a sequence as MnO2>Mn2O3≈Mn3O4>MnOOH with benzaldehyde being the main product. On the basis of H2-TPR results, the superior activity of MnO2 is ascribed to its lower reduction temperature and therefore high oxygen mobility and excellent redox ability. Moreover, a good recycling ability was observed over MnO2 catalysts by simply thermal treatment in air.
Key words:  Manganese oxides, Nanorod, Oxidation of benzyl alcohol, X-ray photoelectron spectroscopy, H2-TPR
FundProject:
一维锰氧化物纳米棒在以O2为氧源的苯甲醇氧化反应中的催化性能
杨晶1, 华青1,2,3, 常苏捷1,2,3, 于先琴1, 马运生*1, 黄伟新*1,2,3
1.中国科学技术大学化学物理系,合肥230026;2.中国科学技术大学中国科学院能量转换材料重点实验室,合肥230026;3.中国科学技术大学合肥微尺度物质科学国家实验室(筹),合肥230026
摘要:
采用水热法合成MnOOH一维纳米线,通过MnOOH在不同气氛和温度中煅烧得到尺寸和形貌相似的不同锰氧化物,并用于以O2为氧源的苯甲醇液相氧化反应. 结果表明,MnO2对苯甲醇氧化反应具有较高的催化活性. 通过XPS、SEM、TEM和H2-TPR等手段对催化剂的形貌和结构进行了表征,并讨论了可能影响反应活性的一些因素. MnO2的良好催化性能可能与其晶格氧具有较高的迁移率以及氧化还原能力有关. 通过简单的焙烧处理,可以使MnO2催化剂在苯甲醇氧化反应中具有良好的重复使用性.
关键词:  锰氧化物,纳米棒,苯甲醇氧化,XPS,H2-TPR
DOI:10.1063/1674-0068/26/04/424-430
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