Characterization and Mobility of the Different Protonic Species in Anhydrous and Hydrated 12-Tungstophosphoric Acid Studied by Solid State 2H NMR | Sciact - CRIS-system of Boreskov Institute of Catalysis

Characterization and Mobility of the Different Protonic Species in Anhydrous and Hydrated 12-Tungstophosphoric Acid Studied by Solid State 2H NMR Conference Abstracts

Conference

EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources”
30 Aug - 4 Sep 2015 , Казань

Source

EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis, Kazan (Russia), 30 August - 4 September, 2015 : Book of Abstracts
Compilation, BIC SB RAS. Novosibirsk.2015. 2184 c. ISBN 978-5-906376-10-7. РИНЦ

Output data

Year: 2015, Article number : II-PP45, Pages count : 2

Authors

Kolokolov D.I. ^1,2 , Luzgin M.V. ^1,2 , Jobic H. ³ , Stepanov A.G. ^1,2

Affiliations

1	Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
2	Novosibirsk State University, Faculty of Natural Sciences, Department of Physical Chemistry, Novosibirsk, Russia
3	Institut de Recherches sur la Catalyse et l’Environnement de Lyon, CNRS, Université de Lyon, Villeurbanne, France

Funding (1)

Russian Foundation for Basic Research

12-03-31108

Mobility of the different protonic apecies in Anhydrous and hydrated 12-Tungstophosphoric acid was characterized by solid state 2H NMR. It was demonstrated that in fully anhydrous HPA there are two types of surface protons. The ones rapidly flipping, being localized on the bridged xygen sites, and the ones involved into relatively fast migration over the surface oxygens of the Keggin anion. Below 423 K the population of fast migrating protons is low, but almost all surface protons are rapidly diffusing over the Keggin-anion surface at T > 503 K by hopping between neighboring oxygens. At low hydration levels (n < 6) the TPA surface protons interacts with water to form [D3O]+ and [D5O2]+ ions. The analysis of the evolution of spin relaxation times with temperature for different spectral species allowed quantify the kinetic parameters of the [D3O]+ ion formation/decomposition and to characterize the mobility of the OD, D2O, and [D3O]+ species.

Kolokolov D.I. , Luzgin M.V. , Jobic H. , Stepanov A.G.
Characterization and Mobility of the Different Protonic Species in Anhydrous and Hydrated 12-Tungstophosphoric Acid Studied by Solid State 2H NMR
In compilation EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis, Kazan (Russia), 30 August - 4 September, 2015 : Book of Abstracts. – BIC SB RAS., 2015. – C.525-526. – ISBN 978-5-906376-10-7.

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