NONEQUILIBRIUM NUCLEAR SPIN STATES OF ETHYLENE DURING ACETYLENE HYDROGENATION WITH PARAHYDROGEN OVER IMMOBILIZED IRIDIUM COMPLEXES

I. V. Skovpin; Сковпин И. В.; S. V. Sviyazov; Свиязов С. В.; D. B. Burueva; Буруева Д. Б.; L. M. Kovtunova; Ковтунова Л. М.; A. V. Nartova; Нартова А. В.; R. I. Kvon; Квон Р. И.; V. I. Bukhtiyarov; Бухтияров В. И.; I. V. Koptyug; Коптюг И. В.

doi:10.31857/S2686953522600933

NONEQUILIBRIUM NUCLEAR SPIN STATES OF ETHYLENE DURING ACETYLENE HYDROGENATION WITH PARAHYDROGEN OVER IMMOBILIZED IRIDIUM COMPLEXES

Authors: Skovpin I.V.¹, Sviyazov S.V.¹^,2, Burueva D.B.¹, Kovtunova L.M.¹^,3, Nartova A.V.³, Kvon R.I.³, Bukhtiyarov V.I.³, Koptyug I.V.¹
Affiliations:
1. International Tomography Center, Siberian Branch of the Russian Academy of Sciences
2. Novosibirsk State University
3. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences
Issue: Vol 512, No 1 (2023)
Pages: 120-129
Section: PHYSICAL CHEMISTRY
URL: https://journals.rcsi.science/2686-9535/article/view/247191
DOI: https://doi.org/10.31857/S2686953522600933
EDN: https://elibrary.ru/HPUROO
ID: 247191

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Abstract

In this work rhodium and iridium immobilized complexes were prepared and characterized by X-ray photoelectron spectroscopy. For the first time, hyperpolarized ¹³C-ethylene was detected directly in the gas phase during acetylene hydrogenation with parahydrogen on immobilized iridium complexes. The line shape of polarized ¹³С‑ethylene unambiguously indicates that the hydrogen addition to the triple bond of acetylene on immobilized iridium complexes proceeds via syn-addition. It has been shown that the selective acetylene hydrogenation with parahydrogen over immobilized iridium complexes is an effective chemical method for enriching the nuclear spin isomers of ethylene.

Keywords

hyperpolarization, parahydrogen, parahydrogen-induced polarization, NMR, heterogeneous catalysis, immobilized complexes, XPS, selective hydrogenation, ethylene

References

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