Volume 229, 2021

Hydrogenation of ethylene over palladium: evolution of the catalyst structure by operando synchrotron-based techniques

Abstract

Palladium-based catalysts are exploited on an industrial scale for the selective hydrogenation of hydrocarbons. The formation of palladium carbide and hydride phases under reaction conditions changes the catalytic properties of the material, which points to the importance of operando characterization for determining the relation between the relative fractions of the two phases and the catalyst performance. We present a combined time-resolved characterization by X-ray absorption spectroscopy (in both near-edge and extended regions) and X-ray diffraction of a working palladium-based catalyst during the hydrogenation of ethylene in a wide range of partial pressures of ethylene and hydrogen. Synergistic coupling of multiple techniques allowed us to follow the structural evolution of the palladium lattice as well as the transitions between the metallic, hydride and carbide phases of palladium. The nanometric dimensions of the particles resulted in the considerable contribution of both surface and bulk carbides to the X-ray absorption spectra. During the reaction, palladium carbide is formed, which does not lead to a loss of activity. Unusual contraction of the unit cell parameter of the palladium lattice in the spent catalyst was observed upon increasing hydrogen partial pressure.

Graphical abstract: Hydrogenation of ethylene over palladium: evolution of the catalyst structure by operando synchrotron-based techniques

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
13 दिसम्बर 2019
Accepted
07 फरवरी 2020
First published
07 फरवरी 2020

Faraday Discuss., 2021,229, 197-207

Hydrogenation of ethylene over palladium: evolution of the catalyst structure by operando synchrotron-based techniques

Aram L. Bugaev, O. A. Usoltsev, A. A. Guda, K. A. Lomachenko, M. Brunelli, E. Groppo, R. Pellegrini, A. V. Soldatov and J. A. van Bokhoven, Faraday Discuss., 2021, 229, 197 DOI: 10.1039/C9FD00139E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements