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Pairwise Parahydrogen Addition Over Molybdenum Carbide Catalysts

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Abstract

Herein, we have shown that the phase composition of molybdenum carbide catalysts has a pronounced effect on the pairwise hydrogen addition selectivity in the gas-phase propyne hydrogenation with parahydrogen. Molybdenum carbide catalysts were prepared using either the Pechini method or temperature-programmed reduction with CH4/H2 carburizing gas mixture. The structures of carbide catalysts were characterized by high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. It was found that molybdenum carbide prepared by the Pechini method predominantly contains a face-centered-cubic MoC1−x phase, while the TPR method yields a hexagonal-close-packed Mo2C phase. By varying the gas hourly space velocity of carburizing gas mixture, the defected phase can be produced. Computer modeling for XRD patterns was used to identify the phase composition of Mo2C catalysts. All the catalysts were found to be active in pairwise hydrogen addition; however the hcp-Mo2C phase exhibits a higher contribution of pairwise H2 addition providing ~ 150-fold proton NMR signal enhancement.

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Acknowledgements

ITC team thanks the grants from RFBR (Grant Nos. 19-43-540004, 19-29-10003 and 18-33-20019) for the support of hydrogenation experiments with parahydrogen and the Russian Ministry of Science and Higher Education (АААА-А16-116121510087-5) for the use of NMR equipment. IVK thanks RSF (Grant 19-13-00172) for the support of the studies of active catalytic sites via XPS. AAS thanks Dr. Cherepanova for the help in calculating the XRD patterns of defected phases with different concentrations of stacking faults. AAS and VAY thank Russian Ministry of Science and Higher Education (АААА-А17-117041710075-0) for the support in catalysts synthesis and characterization.

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Correspondence to Kirill V. Kovtunov.

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Burueva, D.B., Smirnov, A.A., Bulavchenko, O.A. et al. Pairwise Parahydrogen Addition Over Molybdenum Carbide Catalysts. Top Catal (2019). https://doi.org/10.1007/s11244-019-01211-z

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Keywords

  • Parahydrogen-induced polarization
  • Parahydrogen
  • Heterogeneous hydrogenation
  • Molybdenum
  • Carbide catalysts