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Redox properties and VOC oxidation activity of Cu catalysts supported on Ce1-xSmxO delta mixed oxides

Title
Redox properties and VOC oxidation activity of Cu catalysts supported on Ce1-xSmxO delta mixed oxides
Type
Article in International Scientific Journal
Year
2013
Authors
M. Konsolakis
(Author)
Other
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P.B. Tavares
(Author)
Other
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J.L. Figueiredo
(Author)
FEUP
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Journal
Vol. 261
Pages: 512-521
ISSN: 0304-3894
Publisher: Elsevier
Indexing
Scientific classification
FOS: Engineering and technology > Chemical engineering
CORDIS: Technological sciences > Engineering > Chemical engineering
Other information
Authenticus ID: P-006-JRZ
Abstract (EN): A series of Cu catalysts supported on Ce1-xSmxO delta mixed oxides with different molar contents (x = 0, 0.25, 0.5, 0.75 and 1), was prepared by wet impregnation and evaluated for volatile organic compounds (VOC) abatement, employing ethyl acetate as model molecule. An extensive characterization study was undertaken in order to correlate the morphological, structural and surface properties of catalysts with their oxidation activity. The optimum performance was obtained with Cu/CeO2 catalyst, which offers complete conversion of ethyl acetate into CO2 at temperatures as low as 260 degrees C. The catalytic performance of Cu/Ce1-xSmxO delta was interpreted on the basis of characterization studies, showing that incorporation of samarium in ceria has a detrimental effect on the textural characteristics and reducibility of catalysts. Moreover, high Sm/Ce atomic ratios (from 1 to 3) resulted in a more reduced copper species, compared to CeO2-rich supports, suggesting the inability of these species to take part in the redox mechanism of VOC abatement. Sm/Ce surface atomic ratios are always much higher than the nominal ratios indicating an impoverishment of catalyst surface in cerium oxide, which is detrimental for VOC activity.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 10
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