Synthesis of copper-promoted CeO2 catalysts
Synthesis of copper-promoted CeO2 catalysts
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DOI：
10.1021/cm052437h
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发表时间：
2006-03
影响因子：
8.6
通讯作者：
M. Jobbágy;F. Mariño;Betina Schoenbrod;G. Baronetti;M. Laborde
中科院分区：
文献类型：
--
作者：
M. Jobbágy;F. Mariño;Betina Schoenbrod;G. Baronetti;M. Laborde
探索尿素法用于高产率制备CuO− CeO 2催化剂前体。将含有尿素、Ce（NO3）3和Cu（NO3）2的溶液在363 K下老化5 h，以无定形Cu（II）−Ce（III）碱性碳酸盐的形式实现定量共沉淀，其中Cu（II）含量高达40%。采用PXRD、SEM、EDS、FTIR和TG等手段对混合前驱体进行了表征。在空气气氛下进行温和的热处理，即，T = 723 K，粉末很容易转化为CuO促进的纳米氧化铈。在873 K退火后没有观察到Tensorite（CuO）的偏析。二元氧化物的特征在于通过程序升温还原（TPR）和一氧化碳的优先氧化（CO-PROX）的测试反应，实现了最佳性能与样品含有约20%的铜原子。
The urea method is explored for a high-yield preparation of CuO−CeO2 catalysts precursors. Solutions containing urea, Ce(NO3)3, and Cu(NO3)2 were aged at 363 K for 5 h, achieving a quantitative coprecipitation in the form of amorphous Cu(II)−Ce(III) basic carbonates, with Cu(II) contents up to 40%. The mixed precursors were characterized by PXRD, SEM, EDS, FTIR, and TG. Upon mild thermal treatment under air atmosphere, i.e., T = 723 K, powders were readily converted into CuO-promoted nanometric ceria. No Tenorite (CuO) segregation is observed after annealing at 873 K. The binary oxides were characterized by means of temperature-programmed reduction (TPR) and a test reaction for the preferential oxidation of carbon monoxide (CO-PROX), achieving the best performance with samples containing around 20% in copper atoms.