Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 21, Pages 8412-8420Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta01199c
Keywords
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Funding
- National Natural Science Foundation of China [21271163, U1232211]
- CAS/SAFEA
- China Postdoctoral Science Foundation [2015M571955]
- china scholarship council (CSC) [201500730008]
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Heterogeneous catalysts facilitate various chemical reactions through the changing of its surface charge density. However, the easy agglomeration of nano-sized heterogeneous catalysts and either expensive techniques or a multistep method involved in the fabrication of such hybrid structures makes developing low-cost, agglomeration-free heterogeneous catalysts highly desirable. Copper and its oxides have long been studied as catalysts towards CO oxidation. Few reports have appeared concerning the catalytic activity of Cu/Cu2O and Cu/CuO interface because the interfaces tend to form core-shell structures in oxygen atmospheres, making the interface buried inside the oxide layers. Herein, we designed Cu/Cu2O nanojunctions wrapped and supported by porous carbon through the direct annealing of a Cu-based metal-organic framework (Cu-BTC) in N-2, followed by testing its catalytic activity towards CO oxidation. In addition, CO oxidation reactions over Cu, Cu2O, CuO and the interface of Cu/Cu2O and Cu/CuO are studied via density functional theory (DFT) simulations. The catalyst shows a complete CO conversion temperature (T-100) of 155 degrees C under both 1 vol% and 5 vol% CO. In addition, it maintains long-term durability even after 40 h under 1 vol% CO. Our DFT calculations demonstrate that the significant increase in electron density on the Cu/Cu2O and Cu/CuO interface plays a pivotal rote in the enhancement of CO oxidation. Moreover, this study provides a new strategy for synthesizing carbon supported metal/metal oxide hybrid catalysts.
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