High-Resolution NMR of the Hydrogenation Reaction with Parahydrogen in an Inhomogeneous Magnetic Field | Sciact - CRIS-system of Boreskov Institute of Catalysis

High-Resolution NMR of the Hydrogenation Reaction with Parahydrogen in an Inhomogeneous Magnetic Field Full article

Journal

Journal of Physical Chemistry Letters
ISSN: 1948-7185

Output data

Year: 2025, Volume: 16, Number: 2, Pages: 650-657 Pages count : 8 DOI: 10.1021/acs.jpclett.4c03154

Authors

Kononenko Elizaveta S. ^1,2 , Skovpin Ivan V. ¹ , Kovtunova Larisa M. ^3,1,2 , Koptyug Igor V. ¹

Affiliations

1	International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
2	Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia
3	Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk 630090, Russia

Funding (1)

Russian Science Foundation

24-73-10093

Nuclear magnetic resonance is extremely attractive for operando studies of chemical reactors. However, the heterogeneous catalyst particles placed inside an NMR probe greatly affect the uniformity of the magnetic field. This problem is especially acute when studying heterogeneous hydrogenation processes using parahydrogen. Despite the increased sensitivity due to hyperpolarization, under conditions of a strong heterogeneity of the magnetic field, the antiphase nature of the NMR signals leads to a partial or even a complete loss of spectroscopic information due to significant NMR signal broadening. The use of intramolecular multiple-quantum coherences in 2D NMR allows one to circumvent this problem. We used the COSY pulse sequence to acquire 2D NMR spectra of the reaction mixture upon propene hydrogenation with parahydrogen. The selection of double-quantum coherences in the resulting 2D NMR spectrum allowed us to obtain a highly resolved NMR spectrum under conditions of severe inhomogeneity of the magnetic field caused by the presence of catalyst granules.

Kononenko E.S. , Skovpin I.V. , Kovtunova L.M. , Koptyug I.V.
High-Resolution NMR of the Hydrogenation Reaction with Parahydrogen in an Inhomogeneous Magnetic Field
Journal of Physical Chemistry Letters. 2025. V.16. N2. P.650-657. DOI: 10.1021/acs.jpclett.4c03154 WOS Scopus OpenAlex

Published online:

Jan 9, 2025

Web of science:	WOS:001393253200001
Scopus:	2-s2.0-85214323476
OpenAlex:	W4406217206

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