CuO-CeO₂ catalysts synthesized in one-step: Characterization and PROX performance

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• 作者：V.D. Araú ; jo^a ; ^{dantas@ursa.ifsc.usp.br} ; ^{vicodantas@yahoo.com.br} ; J.D.A. Bellido^b ; M.I.B. Bernardi^a ; J.M. Assaf^c ; E.M. Assaf^d
• 关键词：PROX ; CuO&ndash ; CeO2 ; Hydrogen ; Polymeric precursor method
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5498-5507
• 文件大小：788 K

摘要

PEM fuel cells seem to be the most affordable and commercially viable hydrogen-based cells, the biggest challenge being to obtain CO-free H₂ (<100聽ppm) as the fuel. In this study, the use of CuO-CeO₂ catalysts in preferential oxidation of CO to obtain CO-free H₂ (PROX reaction) was investigated. Ce_1鈭?em>xem>Cu_<em>xem>O₂ catalysts, with <em>xem> (mol%)聽=聽0, 0.01, 0.03, 0.05 and 0.10, were synthesized in one-step by the polymeric precursor method, to obtain a very fine dispersion and strong metal-support interaction, to favor active copper species and a preference for the PROX reaction. The results obtained from catalyzed reactions and characterization of the catalysts by XRD, Rietveld refinement, BET surface area, UV-Vis and TPR, suggest that this one-step synthesis method gives rise to catalysts with copper species selective for the PROX reaction, which reaches a maximum rate on Ce_0.97Cu_0.03O₂ catalyst.