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Molybdenum Oxide Based Partial Oxidation Catalyst: 4. TEM Identification of a New Oxygen-Reduced Phase Formed During Acrolein Partial Oxidation under Reducing Conditions

MPG-Autoren
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Uchida,  Yuji
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Mestl,  Gerhard
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Ovsitser,  Olga
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Jäger,  Joachim
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Blume,  Andreas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Uchida, Y., Mestl, G., Ovsitser, O., Jäger, J., Blume, A., & Schlögl, R. (2002). Molybdenum Oxide Based Partial Oxidation Catalyst: 4. TEM Identification of a New Oxygen-Reduced Phase Formed During Acrolein Partial Oxidation under Reducing Conditions. Journal of Molecular Catalysis A - Chemical, 187(2), 247-257. Retrieved from http://dx.doi.org/10.1016/S1381-1169(02)00211-X.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-13BC-A
Zusammenfassung
A new Mo-based structure was detected by high resolution transmission electron microscopy (HRTEM) and electron diffraction techniques in a molybdenum based mixed oxide catalyst after operation in the partial oxidation of acrolein at temperatures between 533 and 573 K for 9 h. This new crystalline phase has an orthorhombic crystal system. The structure has presumably a space group of Pban, but Pmmn cannot be excluded. XRD analysis was further used to refine this new Mo2O5 structure. The lattice constants were estimated to be a = 1217.5, b = 374.7 and c = 404.4 pm, respectively. The elemental composition of the crystal was determined by the EDAX system attached to the electron microscope to be about (Mo0.6V0.3W0.1)2O5-x. This new structure is discussed in relation to earlier reports on a comparable composition and with respect to its possible role for partial oxidation catalysis.