Study of Cupric Oxide Nanopowders as Efficient Catalysts for Low-Temperature CO Oxidation Full article
| Journal |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 |
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| Output data | Year: 2013, Volume: 368-369, Pages: 95-106 Pages count : 12 DOI: 10.1016/j.molcata.2012.11.015 | ||||
| Tags | CuO nanoparticles, Low-temperature CO oxidation, XPS | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 10-03-00843 |
Abstract:
CuO nanopowders were prepared by precipitation from alkaline solutions and were studied by TPR-CO + O2, XRD, TGA, TPD-He and XPS. All of the precipitated samples were characterized by excellent catalytic properties toward the low-temperature (LT) oxidation of CO with similar T50 values of 110 °C. In contrast, bulk CuO oxides with sizes greater than 450 nm exhibited no activity at low temperatures. Several monolayers of chemisorbed species, such as water/hydroxyls and carbonate/hydrocarbonates, were typically observed at the surface of the nanopowders. These species were not critical for the LT oxidation of CO, and their preliminary removal did not substantially change the activity of the nanopowders. XPS results indicated a high deficiency of the oxygen sublattice of the CuO1−x (x = 0.1–0.15) nanopowders, whereas, for the lattice of bulk CuO, the Cu/O ratio was 1. The highly deficient oxygen sublattice resulted in a disproportionation process, which, in turn, resulted in two observed oxygen forms. An oxygen form with Eb(O1s) = 531.3 eV that is highly reactive toward CO was proposed to be responsible for the high catalytic activity of the CuO nanopowders. Slight differences in the Cu2p shake-up satellite structures were observed between the bulk and nanosized samples, which indicated that the electronic structure in the cationic sublattice had changed.
Cite:
Svintsitskiy D.A.
, Chupakhin A.P.
, Slavinskaya E.M.
, Stonkus O.A.
, Stadnichenko A.I.
, Koscheev S.V.
, Boronin A.I.
Study of Cupric Oxide Nanopowders as Efficient Catalysts for Low-Temperature CO Oxidation
Journal of Molecular Catalysis A: Chemical. 2013. V.368-369. P.95-106. DOI: 10.1016/j.molcata.2012.11.015 WOS Scopus РИНЦ ANCAN OpenAlex
Study of Cupric Oxide Nanopowders as Efficient Catalysts for Low-Temperature CO Oxidation
Journal of Molecular Catalysis A: Chemical. 2013. V.368-369. P.95-106. DOI: 10.1016/j.molcata.2012.11.015 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Sep 12, 2012 |
| Accepted: | Nov 21, 2012 |
| Published online: | Nov 29, 2012 |
| Published print: | Mar 1, 2013 |
Identifiers:
| Web of science: | WOS:000315176600014 |
| Scopus: | 2-s2.0-84873582179 |
| Elibrary: | 20433060 |
| Chemical Abstracts: | 2013:227112 |
| Chemical Abstracts (print): | 158:280763 |
| OpenAlex: | W2075472411 |