1H and 93Nb Solid-State NMR and IR Study of Acidity of Nanodisperse Nb2O5·nH2O
- 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:
- Boreskov Institute of Catalysis SB RAS
- Novosibirsk State University
- Issue: Vol 50, No 4 (2019)
- Pages: 589-597
- Section: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/248606
- DOI: https://doi.org/10.1007/s00723-019-01118-8
- ID: 248606
Cite item
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.
About the authors
I. V. Yakovlev
Boreskov Institute of Catalysis SB RAS; Novosibirsk State University
Author for correspondence.
Email: i.iakovlev9@g.nsu.ru
ORCID iD: 0000-0002-0523-9980
Russian Federation, Novosibirsk; Novosibirsk
E. Papulovskiy
Boreskov Institute of Catalysis SB RAS
Email: i.iakovlev9@g.nsu.ru
ORCID iD: 0000-0002-2660-8001
Russian Federation, Novosibirsk
E. A. Paukshtis
Boreskov Institute of Catalysis SB RAS
Email: i.iakovlev9@g.nsu.ru
ORCID iD: 0000-0003-2122-5738
Russian Federation, Novosibirsk
V. M. Bondareva
Boreskov Institute of Catalysis SB RAS
Email: i.iakovlev9@g.nsu.ru
Russian Federation, Novosibirsk
A. V. Toktarev
Boreskov Institute of Catalysis SB RAS
Email: i.iakovlev9@g.nsu.ru
Russian Federation, Novosibirsk
V. I. Zaikovskii
Boreskov Institute of Catalysis SB RAS
Email: i.iakovlev9@g.nsu.ru
ORCID iD: 0000-0001-6590-7242
Russian Federation, Novosibirsk
O. B. Lapina
Boreskov Institute of Catalysis SB RAS; Novosibirsk State University
Email: i.iakovlev9@g.nsu.ru
ORCID iD: 0000-0002-9911-7617
Russian Federation, Novosibirsk; Novosibirsk