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Additional effects of cobalt precursor and zirconia support modifications for the design of efficient VOC oxidation catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
48822 46522 2007 7 PDF Available
Title
Additional effects of cobalt precursor and zirconia support modifications for the design of efficient VOC oxidation catalysts
Abstract

The influence of the ZrO2 support modification by Y2O3 and the presence of ethylenediamine (“en”) during the preparation of Co/ZrO2 were studied and compared with a reference catalyst conventionally prepared by impregnation of ZrO2 with an aqueous solution of Co(NO3)2. The effect of the en/Co molar ratio (x = 1–3) was studied. Activation of cobalt species was followed by differential thermal and thermogravimetric analyses (DTA/TG) analyses and by specific surface area measurements which evidence the complete cobalt precursor decomposition at 450 °C, whatever the support composition and the en/Co molar ratio. The addition of an aqueous solution of ethylenediamine to a cobalt nitrate solution led to a strong increase in the catalytic activity of the activated solids for the toluene deep oxidation as compared to the reference catalyst. The best catalytic results were explained in terms of cobalt oxides dispersion (X-ray diffraction (XRD)) and also in terms of Co-support interaction (H2-temperature-programmed reduction (TPR)). The generated cobalt species were reducible at much lower temperatures and were more active in the toluene total oxidation. Finally, an efficient catalyst was produced combining the modifications of the support by yttrium oxide and of the precursor (use of ethylenediamine).

Keywords
Zirconia; Cobalt oxides; Ethylenediamine; Yttrium oxide; Toluene total oxidation
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Additional effects of cobalt precursor and zirconia support modifications for the design of efficient VOC oxidation catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 70, Issues 1–4, 31 January 2007, Pages 393–399
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us