Robust In Situ Magnetic Resonance Imaging of Heterogeneous Catalytic Hydrogenation with and without Hyperpolarization

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Robust In Situ Magnetic Resonance Imaging of Heterogeneous Catalytic Hydrogenation with and without Hyperpolarization. / Kovtunov, Kirill V.; Lebedev, Dmitry; Svyatova, Alexandra et al.

In: ChemCatChem, Vol. 11, No. 3, 06.02.2019, p. 969-973.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{20f8d4e4ef174b9fb2a8b08e6cfafe56,

title = "Robust In Situ Magnetic Resonance Imaging of Heterogeneous Catalytic Hydrogenation with and without Hyperpolarization",

abstract = "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.",

keywords = "heterogeneous hydrogenation, MRI, parahydrogen, reactor, rhodium",

author = "Kovtunov, {Kirill V.} and Dmitry Lebedev and Alexandra Svyatova and Pokochueva, {Ekaterina V.} and Prosvirin, {Igor P.} and Gerasimov, {Evgeniy Y.} and Bukhtiyarov, {Valerii I.} and M{\"u}ller, {Christoph R.} and Alexey Fedorov and Koptyug, {Igor V.}",

note = "Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2019",

month = feb,

day = "6",

doi = "10.1002/cctc.201801820",

language = "English",

volume = "11",

pages = "969--973",

journal = "ChemCatChem",

issn = "1867-3880",

publisher = "Wiley - VCH Verlag GmbH & CO. KGaA",

number = "3",

}

RIS

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.

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