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Title: Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b05492· OSTI ID:1376480
ORCiD logo [1];  [2]; ORCiD logo [3];  [2];  [1];  [3];  [3]; ORCiD logo [4];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division. Center for Nanophase Materials Sciences
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  3. Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemical and Petroleum Engineering. Dept. of Chemistry
  4. Univ. of Tennessee, Oak Ridge, TN (United States). Joint Inst. for Computational Sciences

Ceria has recently shown intriguing hydrogenation reactivity in catalyzing alkyne selectively to alkenes. However, the mechanism of the hydrogenation reaction, especially the activation of H2, remains experimentally elusive. In this paper, we report the first direct spectroscopy evidence for the presence of both surface and bulk Ce–H species upon H2 dissociation over ceria via in situ inelastic neutron scattering spectroscopy. Combined with in situ ambient-pressure X-ray photoelectron spectroscopy, IR, and Raman spectroscopic studies, the results together point to a heterolytic dissociation mechanism of H2 over ceria, leading to either homolytic products (surface OHs) on a close-to-stoichiometric ceria surface or heterolytic products (Ce–H and OH) with the presence of induced oxygen vacancies in ceria. Finally, the finding of this work has significant implications for understanding catalysis by ceria in both hydrogenation and redox reactions where hydrogen is involved.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program
Contributing Organization:
Univ. of Tennessee, Oak Ridge, TN (United States)
Grant/Contract Number:
AC05-00OR22725; SC0014561
OSTI ID:
1376480
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 28; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 103 works
Citation information provided by
Web of Science

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Cited By (13)

Neutron Scattering Investigations of Hydride Species in Heterogeneous Catalysis journal November 2018
Enhanced ammonia synthesis performance of ceria-supported Ru catalysts via introduction of titanium journal January 2020
An in situ DRIFTS mechanistic study of CeO 2 -catalyzed acetylene semihydrogenation reaction journal January 2018
Activation and Spillover of Hydrogen on Sub‐1 nm Palladium Nanoclusters Confined within Sodalite Zeolite for the Semi‐Hydrogenation of Alkynes journal May 2019
H 2 reduction of Gd- and Sm-doped ceria compared to pure CeO 2 at high temperatures: effect on structure, oxygen nonstoichiometry, hydrogen solubility and hydroxyl chemistry journal January 2018
H2 Dissociation and Oxygen Vacancy Formation on Ce2O3 Surfaces journal May 2019
Oxidation of Reduced Ceria by Incorporation of Hydrogen journal September 2019
Temperature-induced structural transition of ceria by bulk reduction under hydrogen atmosphere journal January 2018
Oxidation of Reduced Ceria by Incorporation of Hydrogen journal September 2019
On the structural stability of crystalline ceria phases in undoped and acceptor-doped ceria materials under in situ reduction conditions journal January 2019
Photoionization Mass Spectrometry for Online Detection of Reactive and Unstable Gas‐Phase Intermediates in Heterogeneous Catalytic Reactions journal December 2019
Neutron Scattering Investigations of Hydride Species in Heterogeneous Catalysis journal December 2018
Activation and Spillover of Hydrogen on Sub‐1 nm Palladium Nanoclusters Confined within Sodalite Zeolite for the Semi‐Hydrogenation of Alkynes journal June 2019