O-17 MAS NMR-STUDY OF 12-MOLYBDOPHOSPHORIC ACID

Authors
KOZHEVNIKOV IV SINNEMA A VANBEKKUM H FOURNIER M
Citation
Iv. Kozhevnikov et al., O-17 MAS NMR-STUDY OF 12-MOLYBDOPHOSPHORIC ACID, Catalysis letters, 41(3-4), 1996, pp. 153-157
Citations number
30
Categorie Soggetti
Chemistry Physical
Journal title
Catalysis letters → ACNP
ISSN journal
1011372X
Volume
41
Issue
3-4
Year of publication
1996
Pages
153 - 157
Database
ISI
SICI code
1011-372X(1996)41:3-4<153:OMNO1A>2.0.ZU;2-V
Abstract
O-17 MAS NMR spectra for O-17 enriched solid heteropoly acid H3PMo12O4 0 are reported. The oxygen exchange between solid (H3PMo12O40)-O-17 an d (H2O)-O-16 vapor at 200-250 degrees is shown to be accompanied by fa st mixing of terminal Mo=O and bridging Mo-O-Mo oxygens in the Keggin unit. The oxygen exchange in (H3PMo12O40)-O-17 is much faster than in (H3PW12O40)-O-17 in solution as well as in the gas phase.