Relationship between structural properties and activity in complete benzene oxidation over Au/CeO2-CoOx catalysts
Relationship between structural properties and activity in complete benzene oxidation over Au/CeO2-CoOx catalysts
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DOI：
10.1016/j.cattod.2012.03.006
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发表时间：
2012-06
期刊：
影响因子：
5.3
通讯作者：
L. Ilieva;P. Petrova;T. Tabakova;R. Zanella;M. Abrashev;J. Sobczak;W. Lisowski;Z. Kaszkur;D. Andreeva
中科院分区：
文献类型：
--
作者：
L. Ilieva;P. Petrova;T. Tabakova;R. Zanella;M. Abrashev;J. Sobczak;W. Lisowski;Z. Kaszkur;D. Andreeva
采用共沉淀法（CP）和机械化学活化法（MA）制备了Au/CeO 2-CoOx催化剂。通过XRD、HRTEM、XPS、拉曼光谱和TPR测试对催化剂进行了表征。结果表明，MA法制备的催化剂在苯完全氧化反应中的活性明显高于CP法制备的催化剂。这种不同的催化行为的原因是在不同的制备方法的载体的结构和性能的差异。在MA模式的情况下，具有增强的氧化还原性能的影响的金和改性的氧化铈在附近的共相的存在可能是负责观察到的高催化活性在相对较低的温度下在CBO的反应。
Au/CeO2–CoOxcatalysts were synthesized using two methods for the mixed support preparation: co-precipitation (CP) or mechanochemical activation (MA). The catalysts were characterized by means of XRD, HRTEM, XPS, Raman spectroscopy and TPR measurements. It was established that the catalyst prepared by MA exhibited much higher activity in the reaction of complete benzene oxidation (CBO) than that prepared using CP. The reason of this different catalytic behavior was search in the differences in the structure and properties of the support depending on the preparation method. In the case of MA mode, the existence of Co-phase with enhanced redox properties influenced both of gold and modified ceria in close vicinity could be responsible for the observed high catalytic activity at relatively low temperatures in the reaction of CBO.