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Characterization and Quantification of Reduced Sites on Supported Vanadium Oxide Catalysts by Using High‐Frequency Electron Paramagnetic Resonance
Author(s) -
Dinse Arne,
Carrero Carlos,
Ozarowski Andrzej,
Schomäcker Reinhard,
Schlögl Robert,
Dinse KlausPeter
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201100412
Subject(s) - electron paramagnetic resonance , paramagnetism , vanadium , propane , dehydrogenation , analytical chemistry (journal) , catalysis , chemistry , nuclear chemistry , materials science , inorganic chemistry , nuclear magnetic resonance , biochemistry , physics , organic chemistry , quantum mechanics , chromatography
VO x (1.4–1.7 V nm −2 ) supported on SBA‐15, Al 2 O 3 , or TiO 2 was studied before and after exposure to oxidative dehydrogenation of propane (ODP), and pure hydrogen or propane. After treatment, samples were quenched and frozen in quartz vials and characterized by using high‐frequency electron paramagnetic resonance (HF‐EPR). For SBA‐15‐ and Al 2 O 3 ‐supported vanadia, V 4+ sites were the most abundant paramagnetic species, whereas Ti 3+ was dominant in TiO 2 ‐supported V 2 O 5 . For the quantification of paramagnetic reduced sites, Mn 2+ was used as reference. The maximum relative numbers of reduced V 4+ or Ti 3+ sites were found to increase in the sequence SBA‐15 (11 % V 4+ /V)