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1. Effect of thermal treatment on states of molybdenum in Mo/H-ZSM-5 catalyst for methane dehydroaromatization: ESR and UV-VIS study.

Author

Vasenin, Nikolai T., Anufrienko, Vladimir F., Ismagilov, Ilyas Z., Larina, Tatyana V., Paukshtis, Evgeny A., Matus, Ekaterina V., Tsikoza, Lidiya T., Kerzhentsev, Mikhail A., and Ismagilov, Zinfer R.

Subjects
*MOLYBDENUM, *THERMAL analysis, *CATALYSTS, *METHANE, *ELECTRON paramagnetic resonance, *SPECTRUM analysis
Abstract

Valence and coordination states of molybdenum ions formed upon thermal treatment of Mo/H-ZSM-5 catalyst for methane dehydroaromatization in Ar and Ar/CH4 media at 573-973 K have been studied by ESR and UV-VIS spectroscopy. For comparison, the characteristic ESR spectra of thermolyzed bulk ammonium heptamolybdate have been studied and analyzed in detail. The nature of earlier observed Mo5+ ions has been verified, and new paramagnetic states of molybdenum in Mo/H-ZSM-5 catalysts have been detected: Mo3+ ions, and Mo5+ ions in tetrahedral coordination with delocalization of unpaired electron to Al and H or Al and N atoms. [ABSTRACT FROM AUTHOR]

Published
2005
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