Direct 2H NMR Observation of the Proton Mobility of the Acidic Sites of Anhydrous 12-Tungstophosphoric Acid
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
ChemPhysChem
ISSN: 1439-4235
, E-ISSN: 1439-7641
|
| Output data |
Year: 2013,
Volume: 14,
Number: 9,
Pages: 1783-1786
Pages count
: 4
DOI:
10.1002/cphc.201300291
|
| Tags |
heterogeneous catalysis, NMR spectroscopy, proton mobility, solid heteropolyacids, solid state |
| Authors |
Kolokolov Daniil I.
1
,
Kazantsev Maxim S.
1
,
Luzgin Mikhail V.
1
,
Jobic Herve
2
,
Stepanov Alexander G.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
| 2 |
Institute of Researches on Catalysis and Environment in Lyon
|
|
Funding (1)
|
1
|
Russian Foundation for Basic Research
|
12-03-31108
|
The proton dynamics of solid 12-tungstophosphoric acid (TPA) is probed by solid-state 2H NMR in a temperature range from 293–503 K. Protons of TPA are shown to be involved in two types of molecular motion (see picture): the anisotropic local two-site flipping between the two possible orientations of the O[BOND]H bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.