Svyatova, Alexandra, Elizaveta S. Kononenko, Kirill V. Kovtunov, Dmitry Lebedev, Evgeniy Yu. Gerasimov, Andrey V. Bukhtiyarov, Igor P. Prosvirin, et al. “Spatially Resolved NMR Spectroscopy of Heterogeneous Gas Phase Hydrogenation of 1,3-Butadiene with Para-Hydrogen.” Catalysis Science & Technology 10, no. 1 (2020): 99–104.
Magnetic resonance-based methods such as nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) are widely used to provide in situ/operando information of chemical reactions. However, the low spin density and magnetic field inhomogeneities associated with heterogeneous catalytic systems containing gaseous reactants complicate such studies. Hyperpolarization techniques, in particular parahydrogen-induced polarization (PHIP), increase significantly the NMR signal intensity. In this study, we test 16 glass tube reactors containing Pd, Pt, Rh or Ir nanoparticles dispersed on a thin layer of TiO2, CeO2, SiO2 or Al2O3 for the hydrogenation of 1,3-butadiene using parahydrogen. The catalytic coatings of Ir and Rh gave hydrogenation products with the highest nuclear spin polarization while the coatings of Pd are the most selective ones for the semihydrogenation of 1,3-butadiene to 1- and 2-butenes. Spatially resolved NMR spectroscopy of the reagent and the product distribution along the reactor axis provided further mechanistic insight into the catalytic function of these reactive coatings under operando conditions.
Spatially resolved NMR spectroscopy of heterogeneous gas phase hydrogenation of 1,3-butadiene with para-hydrogen
From The DNP-NMR Blog:
Spatially resolved NMR spectroscopy of heterogeneous gas phase hydrogenation of 1,3-butadiene with para-hydrogen
Svyatova, Alexandra, Elizaveta S. Kononenko, Kirill V. Kovtunov, Dmitry Lebedev, Evgeniy Yu. Gerasimov, Andrey V. Bukhtiyarov, Igor P. Prosvirin, et al. “Spatially Resolved NMR Spectroscopy of Heterogeneous Gas Phase Hydrogenation of 1,3-Butadiene with Para Hydrogen.” Catalysis Science & Technology 10, no. 1 (2020): 99–104
https://doi.org/10.1039/C9CY02100K.
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08-07-2020 08:10 PM
Aqueous, Heterogeneous para-Hydrogen-Induced 15N Polarization
From The DNP-NMR Blog:
Aqueous, Heterogeneous para-Hydrogen-Induced 15N Polarization
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Bales, L.B., et al., Aqueous, Heterogeneous para-Hydrogen-Induced 15N Polarization. The Journal of Physical Chemistry C, 2017. 121(28): p. 15304-15309.
http://dx.doi.org/10.1021/acs.jpcc.7b05912
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12-22-2017 07:55 PM
Facet dependent pairwise addition of hydrogen over Pd nanocrystal catalysts revealed via NMR using para-hydrogen-induced polarization
From The DNP-NMR Blog:
Facet dependent pairwise addition of hydrogen over Pd nanocrystal catalysts revealed via NMR using para-hydrogen-induced polarization
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Wang, W., et al., Facet dependent pairwise addition of hydrogen over Pd nanocrystal catalysts revealed via NMR using para-hydrogen-induced polarization. Phys. Chem. Chem. Phys., 2017. 19(14): p. 9349-9353.
https://www.ncbi.nlm.nih.gov/pubmed/28138682
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06-22-2017 07:44 AM
Journal Highlight: Mutual diffusion driven NMR: a new approach for the analysis of mixtures by spatially resolved NMR spectroscopy
Journal Highlight: Mutual diffusion driven NMR: a new approach for the analysis of mixtures by spatially resolved NMR spectroscopy
http://www.spectroscopynow.com/common/images/thumbnails/15c4eade5e6.jpgA new approach has been established for resolving the NMR spectra of mixtures, relying on the mutual diffusion of dissolved species when a concentration gradient is established within the NMR tube.
Read the rest at Spectroscopynow.com
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General
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05-29-2017 09:59 AM
Surface ligand-directed pair-wise hydrogenation for heterogeneous phase hyperpolarization
From The DNP-NMR Blog:
Surface ligand-directed pair-wise hydrogenation for heterogeneous phase hyperpolarization
Gloggler, S., et al., Surface ligand-directed pair-wise hydrogenation for heterogeneous phase hyperpolarization. Chem Commun (Camb), 2016. 52(3): p. 605-8.
http://www.ncbi.nlm.nih.gov/pubmed/26553609
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03-14-2016 11:01 PM
[NMR paper] Para-hydrogen perspectives in hyperpolarized NMR.
Para-hydrogen perspectives in hyperpolarized NMR.
http://www.bionmr.com//www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles Para-hydrogen perspectives in hyperpolarized NMR.
J Magn Reson. 2013 Oct;235:130-42
Authors: Glöggler S, Colell J, Appelt S
Abstract
The first instance of para-hydrogen induced polarization (PHIP) in an NMR experiment was serendipitously observed in the 1980s while investigating a hydrogenation reaction (Seldler et al., 1983; Bowers and...
Spatially resolved NMR spectroscopy of heterogeneous gas phase hydrogenation of 1,3-butadiene with para-hydrogen
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