Pairwise Parahydrogen Addition Over Molybdenum Carbide Catalysts

Pairwise Parahydrogen Addition Over Molybdenum Carbide Catalysts Full article

Journal

Topics in Catalysis
ISSN: 1022-5528

Output data

Year: 2020, Volume: 63, Number: 1-2, Pages: 2-11 Pages count : 10 DOI: 10.1007/s11244-019-01211-z

Authors

Burueva Dudari B. ^1,3 , Smirnov Andrey A. ^2,3 , Bulavchenko Olga A. ^2,3 , Prosvirin Igor P. ^2,3 , Gerasimov Evgeny Yu ^2,3 , Yakovlev Vadim A. ^2,3 , Kovtunov Kirill V. ^1,2,3 , Koptyug Igor V. ^1,2,3

Affiliations

1	Laboratory of Magnetic Resonance Microimaging, International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia, 630090
2	Boreskov Institute of Catalysis SB RAS, 5 Lavrentiev Ave., Novosibirsk, Russia, 630090
3	Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090

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.

Burueva D.B. , Smirnov A.A. , Bulavchenko O.A. , Prosvirin I.P. , Gerasimov E.Y. , Yakovlev V.A. , Kovtunov K.V. , Koptyug I.V.
Pairwise Parahydrogen Addition Over Molybdenum Carbide Catalysts
Topics in Catalysis. 2020. V.63. N1-2. P.2-11. DOI: 10.1007/s11244-019-01211-z WOS Scopus

Published online:	Dec 14, 2019
Published print:	Mar 1, 2020

Web of science:	WOS:000519929000002
Scopus:	2-s2.0-85076839543

DB	Citing
Scopus	19
Web of science	18