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Dealloying assisted high-yield growth of surfactant-free < 110 > highly active Cu-doped CeO2 nanowires for low-temperature CO oxidation

By Tianyi Kou, Conghui Si, John Pinto, Chunyan Ma and Zhonghua Zhang

Abstract

CeO2 is widely used as a commercial CO oxidation catalyst, but it suffers from high-temperature (&gt;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

Year: 2017
DOI identifier: 10.1039/c7nr02405c
OAI identifier: oai:ir.rcees.ac.cn:311016/39465
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