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

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 intera...

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Published in:Nano research 2020-02, Vol.13 (2), p.533-542
Main Authors: Khan, Wasim U., Chen, Season S., Tsang, Daniel C. W., Teoh, Wey Yang, Hu, Xijun, Lam, Frank L. Y., Yip, Alex C. K.
Format: Article
Language:English
Subjects:
Aluminum oxide
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Carbon monoxide
Catalysts
Catalytic activity
Chemisorption
Chemistry and Materials Science
Condensed Matter Physics
Copper
Dispersion
Interfaces
Materials Science
Morphology
Nanoparticles
Nanorods
Nanotechnology
Oxidation
Photoelectron spectroscopy
Photoelectrons
Reaction mechanisms
Research Article
Silica
Silicon dioxide
Titanium
Titanium dioxide
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Summary: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 (TiO 2 -P25), silica (SiO 2 ) and alumina (Al 2 O 3 ) 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2647-6