The different catalytic behaviour in the propane total oxidation of cobalt and manganese oxides prepared by a wet combustion procedure
The different catalytic behaviour in the propane total oxidation of cobalt and manganese oxides prepared by a wet combustion procedure
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DOI：
10.1016/j.cej.2013.06.041
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发表时间：
2013-08-01
影响因子：
15.1
通讯作者：
Solsona, Benjamin
中科院分区：
文献类型：
--
作者：
Puertolas, Begona;Smith, Abigail;Solsona, Benjamin
采用湿法燃烧法制备了氧化钴和氧化锰催化剂。这些材料已被测试为丙烷完全氧化的催化剂。已观察到钴和锰氧化物之间的催化行为不同，尽管这两种氧化物都获得了非常高的催化活性。与不添加有机酸的简单氧化钴相比，湿法燃烧法制备的氧化钴的活性较低。然而，在氧化锰的情况下，使用有机酸可以极大地提高催化活性。不同的催化行为与表面特性的变化以及所形成的晶相有关。钴催化剂的活性主要由比表面积决定，因为所有的氧化钴催化剂的比活性是相当的。这一事实与相似的体相和表面氧化还原催化剂特性有关。在氧化锰的情况下，湿法制备的催化剂的比反应速率明显较高，这与还原的相和表面的存在有关。最活跃的氧化锰催化剂是那些表现出最好的氧化还原性能和最高的氧迁移率的催化剂。(C)2013爱思唯尔B.V.保留所有权利。
Cobalt oxide and manganese oxide catalysts have been prepared through aqueous synthesis using a wet combustion procedure. These materials have been tested as catalysts for the total oxidation of propane. It has been observed a different catalytic behaviour between cobalt and manganese oxides although for both oxides a very high catalytic activity has been obtained. Cobalt oxides prepared by the wet combustion procedure are less reactive than a simple cobalt oxide prepared without the addition of organic acids. However, in the case of manganese oxide the use of organic acids highly increases the catalytic activity. The different catalytic behaviour has been related to the variation of the surface characteristics and also to the crystalline phases formed. The activity of Co catalysts has been observed to be mainly determined by the surface area as the specific activity of all cobalt oxide catalysts is comparable. This fact has been related to the similar bulk and surface redox catalyst characteristics. In the case of manganese oxide the specific reaction rate is remarkably higher in those catalysts prepared by wet combustion and this has been linked to the presence of a reduced phase and surface. The most active manganese oxide catalysts are those that present the best redox properties and the highest oxygen mobility. (C) 2013 Elsevier B.V. All rights reserved.