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Nano Research 2020, 13(2): 533-542 https://doi.org/10.1007/s12274-020-2647-6
Research Article | Issue | Published: 23 January 2020

Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

Show Author's Information Wasim U. Khan1,  Season S. Chen2,  Daniel C. W. Tsang2,  Wey Yang Teoh3,  Xijun Hu4,  Frank L. Y. Lam4( ),  Alex C. K. Yip1( )
Department of Chemical and Process Engineering, The University of Canterbury, Christchurch 8041, New Zealand
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
Keywords:
CO oxidation, nanorod, supported catalysts, oxygen species, interfacial active sites
Topics:
Activation energyAluminum OxideCatalyst activityCatalytic oxidation CopperCopper oxidesMorphologyNanocatalystsNanoparticlesNanorodsOxidationOxidesPhosphorus compoundsSilicaSiO2 nanoparticlesTiO2 nanoparticlesTitanium DioxideX-ray photoelectron spectroscopy
Cite this article:
Khan WU, Chen SS, Tsang DCW, et al. Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation. Nano Research, 2020, 13(2): 533-542. https://doi.org/10.1007/s12274-020-2647-6
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Abstract Full text Electronic supplementary material About this article

One-dimensional titanium dioxide nanorod (TNR)-supported Cu catalysts (2.5 wt.%-12.5 wt.%) were synthesized using deposition-precipitation. X-ray photoelectron spectroscopy, temperature programmed reduction and CO chemisorption measurements showed that Cu doping over TNR offered metal-support interactions and interfacial active sites that had a profound impact on the catalytic performance. The role of the Cu-TNR interface was investigated by comparing the catalytic activity of Cu-TNR catalysts with that of pure CuO nanoparticles in CO oxidation. The presence of highly dispersed copper species, a high number of interfacial active sites, CO adsorption capacity and surface/lattice oxygen were found to be responsible for the excellent activity of 7.5Cu-TNR (i.e., Cu loading of 7.5 wt.% on TNR). Moreover, the Cu-TNR catalysts followed the Langmuir-Hinshelwood reaction mechanism with 7.5Cu-TNR, exhibiting an apparent activation energy of 44.7 kJ/mol. The TNR-supported Cu catalyst gave the highest interfacial catalytic activity in medium-temperature CO oxidation (120-240 °C) compared to other commonly used supports, including titanium dioxide nanoparticles (TiO2-P25), silica (SiO2) and alumina (Al2O3) in which copper species were nonhomogeneously dispersed. This study confirms that medium-temperature CO oxidation is highly sensitive to the morphology and structure of the supporting material.


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About this article

Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

Show Author's information Wasim U. Khan1, Season S. Chen2, Daniel C. W. Tsang2, Wey Yang Teoh3, Xijun Hu4, Frank L. Y. Lam4( ), Alex C. K. Yip1( )
Department of Chemical and Process Engineering, The University of Canterbury, Christchurch 8041, New Zealand
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

Abstract

One-dimensional titanium dioxide nanorod (TNR)-supported Cu catalysts (2.5 wt.%-12.5 wt.%) were synthesized using deposition-precipitation. X-ray photoelectron spectroscopy, temperature programmed reduction and CO chemisorption measurements showed that Cu doping over TNR offered metal-support interactions and interfacial active sites that had a profound impact on the catalytic performance. The role of the Cu-TNR interface was investigated by comparing the catalytic activity of Cu-TNR catalysts with that of pure CuO nanoparticles in CO oxidation. The presence of highly dispersed copper species, a high number of interfacial active sites, CO adsorption capacity and surface/lattice oxygen were found to be responsible for the excellent activity of 7.5Cu-TNR (i.e., Cu loading of 7.5 wt.% on TNR). Moreover, the Cu-TNR catalysts followed the Langmuir-Hinshelwood reaction mechanism with 7.5Cu-TNR, exhibiting an apparent activation energy of 44.7 kJ/mol. The TNR-supported Cu catalyst gave the highest interfacial catalytic activity in medium-temperature CO oxidation (120-240 °C) compared to other commonly used supports, including titanium dioxide nanoparticles (TiO2-P25), silica (SiO2) and alumina (Al2O3) in which copper species were nonhomogeneously dispersed. This study confirms that medium-temperature CO oxidation is highly sensitive to the morphology and structure of the supporting material.

Keywords: CO oxidation, nanorod, supported catalysts, oxygen species, interfacial active sites

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Acknowledgements

Publication history

Received: 08 October 2019
Revised: 05 January 2020
Accepted: 08 January 2020
Published: 23 January 2020
Issue date: February 2020

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

The authors would like to thank the financial support from the Ministry of Business, Innovation & Employment in New Zealand under the MBIE Endeavour "Smart Ideas" grant (UOCX1905).

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