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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
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  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Behavior of chromium oxide on MgO or MgF2

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Title
Behavior of chromium oxide on MgO or MgF2
Other Titles
Behavior of chromium oxide on MgO or MgF2
Author
Cho, Dong HyunYim, Sung DaeCha, Gi HunLee, Jae SungKim, Young GulChung, Jong ShikNam, In-Sik
Keywords
RAMAN-SPECTROSCOPIC INVESTIGATIONS; PHILLIPS POLYMERIZATION CATALYST; DIFFUSE-REFLECTANCE SPECTROSCOPY; ETHYLENE POLYMERIZATION; CRO3/AL2O3 CATALYSTS; AMBIENT CONDITIONS; ALUMINA CATALYSTS; SILICA; EQUILIBRIUM; CHEMISTRY
Issue Date
1998-10
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY A, v.102, no.41, pp.7913 - 7918
Abstract
The molecular structure and oxidation state of the chromium oxide on MgO or MgF2 as a function of Cr loading were determined by XRD, Raman spectroscopy, and XPS. The effects of preparation method and the acidity of support were investigated. The Raman study on a series of chromium oxide supported on MgO prepared by an impregnation method showed that the chromium oxide was present as polychromate independent of Cr loading due to high acidity of the preparation solution. In samples prepared by a precipitation method, the chromium oxide was present as monochromate at 5% Cr loading, as dichromate at 10% Cr loading, and as mono- and polychromate at 20% Cr loading due to a larger surface area of the support prepared by this method. The chromium in CrO3/MgF2 was present as polychromate and monochromate for impregnated and precipitated samples, respectively. The oxidation state of Cr(VI) on MgO is maintained independent of Cr loadings. When the 10 wt % Cr/MgO was calcined at 800 degrees C, MgCr2O4 and Cr2O3 were formed. Preferred formation of MgCr2O4 was observed for the precipitated sample due to its larger surface area compared to that of the impregnated sample
URI
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DOI
10.1021/jp981927c
ISSN
1089-5639
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ECHE_Journal Papers
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