期刊
NANOSCALE
卷 9, 期 23, 页码 8007-8014出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr02405c
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资金
- National Natural Science Foundation of China [51371106, 51671115]
- Young Tip-top Talent Support Project (the Organization Department of the Central Committee of the CPC)
CeO2 is widely used as a commercial CO oxidation catalyst, but it suffers from high-temperature (>200 degrees C) complete conversion. Despite enormous efforts made to promote its low-temperature activity by interfacing CuO and CeO2, it is still a long-standing challenge to balance the desired catalytic activity with high-yield preparation. Creating intimate synergistic interfaces between Cu and Ce species and e-ploring surfactant-free large-scale methods are both critical and challenging. To address these concerns, we synthesized highly active Cu doped CeO2 nanowires for low-temperature CO oxidation, relying on intentionally maneuvering precursor alloy compositions and a high-yield dealloying method. The favorable one-dimensional doping structure inherited from the nanowire bundles of the as-dealloyed precursors, clean surfaces and intimate synergistic effects between Cu and Ce contribute to excellent CO oxidation performances, with 5% room-temperature conversion triggered at 35 degrees C and 100% conversion at 100 degrees C. 96% of O-2 selectivity at 88 degrees C in CO preferential oxidation was also obtained. The long-term durability for 24 hours at 100% CO conversion without any decay confirms the robust characteristics of the catalysts. Moreover, this work offers some insights into the reasonable design of alloy precursors to realize property-oriented alloys to nanowires batch transformation for the study of industrial catalysts.
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