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Enhanced CO oxidation on CeO 2 /Co 3 O 4 nanojunctions derived from annealing of metal organic frameworks

Enhanced CO oxidation on CeO 2 /Co 3 O 4 nanojunctions derived from annealing of metal organic... The interface of nanojunctions plays an important role in the performance of heterogeneous catalysts. However, it is highly challenging to construct nanojunctions which are usually prepared by complex multistep processes. Metal–organic frameworks (MOFs), with designable metal centers and tunable organic ligands, are promising precursors for the one-step synthesis of nanojunctions. Herein, we prepared porous CeO 2 /Co 3 O 4 nanojunctions by direct annealing of MOFs in air. These unique nanojunctions exhibit remarkable catalytic activity for CO oxidation, which can achieve complete oxidization of CO to CO 2 at 110 °C. In contrast, the temperature required for 100% CO oxidation is 190 °C for pure Co 3 O 4 . Moreover, the nanojunctions can maintain complete CO conversion after 16 h at 110 °C. Density functional theory calculations revealed that the enhancement in the catalytic activity of CeO 2 /Co 3 O 4 nanojunctions can be attributed to the charge transfer through the interfaces of the nanojunctions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nanoscale Royal Society of Chemistry

Enhanced CO oxidation on CeO 2 /Co 3 O 4 nanojunctions derived from annealing of metal organic frameworks

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References (43)

Publisher
Royal Society of Chemistry
Copyright
This journal is © The Royal Society of Chemistry
ISSN
2040-3364
eISSN
2040-3372
DOI
10.1039/c6nr07725k
pmid
27874127
Publisher site
See Article on Publisher Site

Abstract

The interface of nanojunctions plays an important role in the performance of heterogeneous catalysts. However, it is highly challenging to construct nanojunctions which are usually prepared by complex multistep processes. Metal–organic frameworks (MOFs), with designable metal centers and tunable organic ligands, are promising precursors for the one-step synthesis of nanojunctions. Herein, we prepared porous CeO 2 /Co 3 O 4 nanojunctions by direct annealing of MOFs in air. These unique nanojunctions exhibit remarkable catalytic activity for CO oxidation, which can achieve complete oxidization of CO to CO 2 at 110 °C. In contrast, the temperature required for 100% CO oxidation is 190 °C for pure Co 3 O 4 . Moreover, the nanojunctions can maintain complete CO conversion after 16 h at 110 °C. Density functional theory calculations revealed that the enhancement in the catalytic activity of CeO 2 /Co 3 O 4 nanojunctions can be attributed to the charge transfer through the interfaces of the nanojunctions.

Journal

NanoscaleRoyal Society of Chemistry

Published: Nov 4, 2016

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