Journal
CATALYSIS TODAY
Volume 256, Issue -, Pages 142-147Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2015.04.027
Keywords
O-2 plasma; Atmospheric pressure; Au/TiO2 catalysts; CO oxidation
Funding
- National Natural Science Foundation of China [11175036]
- Fundamental Research Funds for the Central Universities of China [DUT14RC(3)012]
- Welch Foundation in US [T-0014]
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Atmospheric-pressure O-2 plasma generated by dielectric barrier discharge (DBD) is applied to treat Au/TiO2 catalysts synthesized via the deposition-precipitation method for CO oxidation. The plasmatreated sample (S-P) presents a higher activity than the calcined one (S-C). To elucidate the plasma treatment effect, XPS, TEM/HRTEM, sub-ambient pulse CO chemisorption and in situ DRIFTS techniques were used for catalyst characterization. In comparison with S-C, TEM/HRTEM reveals that the S-P catalyst has small particle size and narrow size distribution; XPS and DRIFTS analyses indicate plentiful surface hydroxyl groups on S-P sample. Pulse CO chemisorption and in situ DRIFTS of CO adsorption show that significant increase of low-coordinated Au species has been achieved by the plasma treatment. The improved activity of S-P is ascribed to large amount of low-coordinated Au species and interface active sites as well as abundant surface hydroxyl groups. (C) 2015 Elsevier B.V. All rights reserved.
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