Back to Search
Start Over
Effect of thermal treatment on states of molybdenum in Mo/H-ZSM-5 catalyst for methane dehydroaromatization: ESR and UV-VIS study.
- Source :
- Topics in Catalysis; Feb2005, Vol. 32 Issue 1/2, p61-70, 10p
- Publication Year :
- 2005
-
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/CH<subscript>4</subscript> 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 Mo<superscript>5+</superscript> ions has been verified, and new paramagnetic states of molybdenum in Mo/H-ZSM-5 catalysts have been detected: Mo<superscript>3+</superscript> ions, and Mo<superscript>5+</superscript> ions in tetrahedral coordination with delocalization of unpaired electron to Al and H or Al and N atoms. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10225528
- Volume :
- 32
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Topics in Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 15909560
- Full Text :
- https://doi.org/10.1007/s11244-005-9260-5