Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 253, Issue -, Pages 160-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.03.081
Keywords
CO oxidation; Oxygen-rich stream; Hydrogen-rich stream; Au catalysts; Copper and cuprous oxides
Funding
- Key Research and Development Plan of Shandong Province [2018CXGC1108]
- Natural Science Foundation of China [21603181, 21773202]
- Shandong Taishan Scholarship from Yantai University
- Yantai double-hundreds talents plan from Yantai University
- 152 talents program from Yantai University
- Collaborative Innovation Center of Light Hydrocarbon Transformation and Utilization
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In order to clarify the nature of cooperation effect of gold-copper in CO oxidation without disturb of substrate materials, in this work we prepared nano-sized copper and cuprous oxide with different morphologies followed by the deposition of gold nanoparticles. The reaction of CO oxidation under both hydrogen-rich and oxygen-rich streams was investigated over as-prepared CuO/Cu2O materials and the corresponding supported gold catalysts. The characterizations reveal that in the unreduced Au/Cu2O samples, Au+-Cu2+ assembles are dominant on the surface of Cu2O substrate due to the spontaneous oxidation-reduction reaction of Au3+ and Cu+, while both of Au3+-Cu2+ and Au+-Cu2+ entireties are existed in the unreduced Au/CuO sample and the former is dominant. A comprehensive analysis of the catalytic results over these samples for CO oxidation in both oxygen-rich and hydrogen-rich streams demonstrates that the CuO species (not Cu2O) play a more critical role for the oxidation of CO and the improved catalytic activity of the Au/CuO catalyst can be attributed to the strong interactions of CuO support with nanogold particles.
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