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采用XRD,TPR,DSC和TG等方法对共沉淀法制备的Pr物种掺杂Co0.1Ce0.9-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,Co0.1Ce0.70Pr0.2Ox样品在反应50 h后活性和H2的选择性仅下降4.6%和7.9%。
The crystal structure, reduction performance and thermal properties of Co0.1Ce0.9-yPryOx catalyst doped with Pr by coprecipitation method were characterized by XRD, TPR, DSC and TG. Steam reforming of ethanol for the probe reaction examined the catalyst activity, selectivity and stability. The results show that with the increase of praseodymium species, the amount of substituted cerium ions increases with the increase of praseodymium ions, which leads to lattice distortion and oxygen vacancies increase. It is also conducive to the dispersion and reduction of cobalt species and the spill and transfer of bulk oxygen. In the steam reforming of ethanol, the catalytic activity, the selectivity of H2 increases with the increase of praseodymium species, while the selectivity of CO and CH4 decreases. The activity of Co0.1Ce0.70Pr0.2Ox after 50 h of reaction and H2 Selectivity decreased only by 4.6% and 7.9%.