镨物种的掺杂量对Co0.1Ce0.9-yPryOx水蒸气重整乙醇反应催化性能的影响
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society（2012）
Abstract
采用XRD,TPR,DSC和TG等方法对共沉淀法制备的Pr物种掺杂Co0.1 Ce0.9-yPryOx催化剂的晶相结构、还原性能及反应后催化剂的热性能等进行了表征,并以水蒸气重整乙醇为探针反应考察了催化剂的活性、选择性和稳定性.结果表明:随着镨物种含量的增加,镨离子取代铈离子数量增多,引起晶格畸变,氧空位增多,并有利于钴物种的分散和还原,引导体相氧的溢出和传递.在水蒸气重整乙醇反应中,催化活性、H2的选择性随镨物种含量的增加而提高,而CO和CH4的选择性降低,Co0.1 Ce0.70 Pr0.2Ox样品在反应50 h后活性和H2的选择性仅下降4.6％和7.9％.
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Key words
Cobalt-cerium oxide,Composite oxide,Ethanol steam reforming,Praseodymia
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