Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Robust In Situ Magnetic Resonance Imaging of Heterogeneous Catalytic Hydrogenation with and without Hyperpolarization. / Kovtunov, Kirill V.; Lebedev, Dmitry; Svyatova, Alexandra и др.
в: ChemCatChem, Том 11, № 3, 06.02.2019, стр. 969-973.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Robust In Situ Magnetic Resonance Imaging of Heterogeneous Catalytic Hydrogenation with and without Hyperpolarization
AU - Kovtunov, Kirill V.
AU - Lebedev, Dmitry
AU - Svyatova, Alexandra
AU - Pokochueva, Ekaterina V.
AU - Prosvirin, Igor P.
AU - Gerasimov, Evgeniy Y.
AU - Bukhtiyarov, Valerii I.
AU - Müller, Christoph R.
AU - Fedorov, Alexey
AU - Koptyug, Igor V.
N1 - Publisher Copyright: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/2/6
Y1 - 2019/2/6
N2 - Magnetic resonance imaging (MRI) is a powerful technique to characterize reactors during operating catalytic processes. However, MRI studies of heterogeneous catalytic reactions are particularly challenging because the low spin density of reacting and product fluids (for gas phase reactions) as well as magnetic field inhomogeneity, caused by the presence of a solid catalyst inside a reactor, exacerbate already low intrinsic sensitivity of this method. While hyperpolarization techniques such as parahydrogen induced polarization (PHIP) can substantially increase the NMR signal intensity, this general strategy to enable MR imaging of working heterogeneous catalysts to date remains underexplored. Here, we present a new type of model catalytic reactors for MRI that allow the characterization of a heterogeneous hydrogenation reaction aided by the PHIP signal enhancement, but also suitable for the imaging of regular non-polarized gases. These catalytic systems permit exploring the complex interplay between chemistry and fluid-dynamics that are typically encountered in practical systems, but mostly absent in simple batch reactors. High stability of the model reactors at catalytic conditions and their fabrication simplicity make this approach compelling for in situ studies of heterogeneous catalytic processes by MRI.
AB - Magnetic resonance imaging (MRI) is a powerful technique to characterize reactors during operating catalytic processes. However, MRI studies of heterogeneous catalytic reactions are particularly challenging because the low spin density of reacting and product fluids (for gas phase reactions) as well as magnetic field inhomogeneity, caused by the presence of a solid catalyst inside a reactor, exacerbate already low intrinsic sensitivity of this method. While hyperpolarization techniques such as parahydrogen induced polarization (PHIP) can substantially increase the NMR signal intensity, this general strategy to enable MR imaging of working heterogeneous catalysts to date remains underexplored. Here, we present a new type of model catalytic reactors for MRI that allow the characterization of a heterogeneous hydrogenation reaction aided by the PHIP signal enhancement, but also suitable for the imaging of regular non-polarized gases. These catalytic systems permit exploring the complex interplay between chemistry and fluid-dynamics that are typically encountered in practical systems, but mostly absent in simple batch reactors. High stability of the model reactors at catalytic conditions and their fabrication simplicity make this approach compelling for in situ studies of heterogeneous catalytic processes by MRI.
KW - heterogeneous hydrogenation
KW - MRI
KW - parahydrogen
KW - reactor
KW - rhodium
UR - http://www.scopus.com/inward/record.url?scp=85059674680&partnerID=8YFLogxK
U2 - 10.1002/cctc.201801820
DO - 10.1002/cctc.201801820
M3 - Article
AN - SCOPUS:85059674680
VL - 11
SP - 969
EP - 973
JO - ChemCatChem
JF - ChemCatChem
SN - 1867-3880
IS - 3
ER -
ID: 18063742