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1H and 93Nb Solid-State NMR and IR Study of Acidity of Nanodisperse Nb2O5·nH2O Full article

Journal Applied Magnetic Resonance
ISSN: 0937-9347 , E-ISSN: 1613-7507
Output data Year: 2019, Volume: 50, Number: 4, Pages: 589-597 Pages count : 9 DOI: 10.1007/s00723-019-01118-8
Tags GENERALIZED GRADIENT APPROXIMATION; NIOBIC ACID; BRONSTED ACID; NANOSHEETS; CATALYSTS; SURFACES
Authors Yakovlev I.V. 1,2 , Papulovskiy E. 1 , Paukshtis E.A. 1 , Bondareva V.M. 1 , Toktarev A.V. 1 , Zaikovskii V.I. 1 , Lapina O.B. 1,2
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia

Funding (2)

1 Russian Foundation for Basic Research 17-03-00531
2 Ministry of Science and Higher Education of the Russian Federation ГЗ-2017-2020

Abstract: Niobium oxide hydrate is a promising material for various heterogeneous catalytic processes due to its strong acidity and stability in aqueous medium. While different synthesis conditions may lead to various particle morphologies, the effect of morphology of Nb2O5·nH2O particles on their acidic properties is not fully understood yet. In this paper, we have successfully synthesized and characterized nanodisperse niobium oxide hydrate. Using infrared (IR) spectroscopy, we demonstrated that the sample exhibits strong Brønsted acidity close in strength to sulfuric acid. Furthermore, solid-state nuclear magnetic resonance (NMR) spectroscopy in combination with ab initio calculations gave additional insight into the nature of strong acidic sites and proved to be a useful tool for identification of acidic sites in Nb2O5·nH2O systems. Thus, we have shown that it is not necessary to follow difficult high-temperature solid-state processes or processes with ammonia, which often contaminates the material, to synthesize highly acidic nanodisperse Nb2O5·nH2O.
Cite: Yakovlev I.V. , Papulovskiy E. , Paukshtis E.A. , Bondareva V.M. , Toktarev A.V. , Zaikovskii V.I. , Lapina O.B.
1H and 93Nb Solid-State NMR and IR Study of Acidity of Nanodisperse Nb2O5·nH2O
Applied Magnetic Resonance. 2019. V.50. N4. P.589-597. DOI: 10.1007/s00723-019-01118-8 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: Jul 19, 2018
Accepted: Feb 11, 2019
Published online: Feb 28, 2019
Published print: Apr 1, 2019
Identifiers:
Web of science: WOS:000462570000008
Scopus: 2-s2.0-85062569660
Elibrary: 38679659
Chemical Abstracts: 2019:686738
OpenAlex: W2918919619
Citing:
DB Citing
Scopus 5
Web of science 2
Elibrary 4
OpenAlex 5
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