title: Application of (119)Sn CPMG MAS NMR for Fast Characterization of Sn Sites in Zeolites with Natural (119)Sn Isotope Abundance.
abstract: (119)Sn CPMG MAS NMR is demonstrated to be a fast and efficient method for characterization of Sn-sites in Sn-containing zeolites. Tuning of the CPMG echo-train sequence decreases the experimental time by a factor of 5-40 in the case of as-synthesized and hydrated Sn-BEA samples and by 3 orders of magnitude in the case of dehydrated Sn-BEA samples as compared to conventional methods. In the latter case, the reconstruction of the quantitative spectrum without the loss of sensitivity is shown to be possible. The method proposed allows obtaining (119)Sn MAS NMR spectra with improved resolution for Sn-BEA zeolites with natural (119)Sn isotope abundance using conventional MAS NMR equipment.
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1, 119991, Moscow, Russia.|A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy prospect 29, 119992, Moscow, Russia.
authors.forename: Yury G
authors.initials: YG
authors.lastname: Kolyagin
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1, 119991, Moscow, Russia.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Yakimov
authors.affiliation: Haldor Topsøe A/S, Haldor Topsøes Allé 1, DK-2800 Kongens Lyngby, Denmark.|Department of Chemistry, Technical University of Denmark , Kemitorvet, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Søren
authors.initials: S
authors.lastname: Tolborg
authors.affiliation: Haldor Topsøe A/S, Haldor Topsøes Allé 1, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Peter N R
authors.initials: PN
authors.lastname: Vennestrøm
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1, 119991, Moscow, Russia.|A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy prospect 29, 119992, Moscow, Russia.
authors.forename: Irina I
authors.initials: II
authors.lastname: Ivanova