High-Temperature NMR Studies of the Glass-Crystal Transition in the Cs2S2O7-V2O5 System Full article
| Journal |
The Journal of Physical Chemistry B
ISSN: 1520-6106 , E-ISSN: 1520-5207 |
||||
|---|---|---|---|---|---|
| Output data | Year: 1997, Volume: 101, Number: 45, Pages: 9188-9194 Pages count : 7 DOI: 10.1021/JP971789B | ||||
| Tags | CATALYST DEACTIVATION; PYROSULFATE MELTS; COMPLEX-FORMATION; PHASE-DIAGRAM; K2S2O7-KHSO4; V2O5-CS2S2O7; CONDUCTIVITY; V2O5-K2S2O7 | ||||
| Authors |
|
||||
| Affiliations |
|
Funding (2)
| 1 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 93-3244 |
| 2 | Russian Foundation for Basic Research | 95-03-08365 |
Abstract:
133Cs NMR and 2D-EXSY NMR and 51V NMR spectra have been recorded of Cs2S2O7 and of the catalytically important Cs2S2O7−V2O5 mixtures in the temperature range 20−550 °C, covering both the solid and liquid region. A high mobility of the Cs+ cations in Cs2S2O7 was observed below the melting point (461 °C), and two crystalline modifications seem to be present depending on the method of preparation of Cs2S2O7. 133Cs and 51V NMR spectra of the Cs2S2O7−V2O5 mixtures with the molar composition Cs/V = 2 and 4 show, by heating from room temperature, in both cases, that the glassy samples transform to crystalline Cs4(VO)2O(SO4)4 around 220 °C and that further heating of the samples up to the melting point leads to a mobility of the Cs cations similar to what was found for Cs2S2O7. For a sample with the composition Cs/V = 1 a similar transformation from a glassy state at around 250 °C is observed; however, here the possible compound CsVO2SO4 seems to be transformed to another crystalline modification by heating to 400 °C. At 550 °C in the molten state the 51V NMR spectra indicate that the coordination of vanadium changes from distorted octahedral in the solid to tetrahedral in the liquid state.
Cite:
Lapina O.B.
, Terskikh V.V.
, Shubin A.A.
, Mastikhin V.M.
, Eriksen K.M.
, Fehrmann R.
High-Temperature NMR Studies of the Glass-Crystal Transition in the Cs2S2O7-V2O5 System
The Journal of Physical Chemistry B. 1997. V.101. N45. P.9188-9194. DOI: 10.1021/JP971789B WOS Scopus РИНЦ ANCAN OpenAlex
High-Temperature NMR Studies of the Glass-Crystal Transition in the Cs2S2O7-V2O5 System
The Journal of Physical Chemistry B. 1997. V.101. N45. P.9188-9194. DOI: 10.1021/JP971789B WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jun 2, 1997 |
| Accepted: | Aug 14, 1997 |
| Published print: | Nov 1, 1997 |
Identifiers:
| Web of science: | WOS:A1997YF25500009 |
| Scopus: | 2-s2.0-0031556579 |
| Elibrary: | 43189837 |
| Chemical Abstracts: | 1997:682597 |
| Chemical Abstracts (print): | 127:286070 |
| OpenAlex: | W2036873183 |