Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst
Abstract
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.
- Authors:
-
[1];
[3];
[4];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division. Center for Nanophase Materials Sciences
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
- Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemical and Petroleum Engineering. Dept. of Chemistry
- Univ. of Tennessee, Oak Ridge, TN (United States). Joint Inst. for Computational Sciences
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program
- Contributing Org.:
- Univ. of Tennessee, Oak Ridge, TN (United States)
- OSTI Identifier:
- 1376480
- Grant/Contract Number:
- AC05-00OR22725; SC0014561
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 139; Journal Issue: 28; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Wu, Zili, Cheng, Yongqiang, Tao, Franklin, Daemen, Luke, Foo, Guo Shiou, Nguyen, Luan, Zhang, Xiaoyan, Beste, Ariana, and Ramirez-Cuesta, Anibal J. Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst. United States: N. p., 2017.
Web. doi:10.1021/jacs.7b05492.
Wu, Zili, Cheng, Yongqiang, Tao, Franklin, Daemen, Luke, Foo, Guo Shiou, Nguyen, Luan, Zhang, Xiaoyan, Beste, Ariana, & Ramirez-Cuesta, Anibal J. Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst. United States. https://doi.org/10.1021/jacs.7b05492
Wu, Zili, Cheng, Yongqiang, Tao, Franklin, Daemen, Luke, Foo, Guo Shiou, Nguyen, Luan, Zhang, Xiaoyan, Beste, Ariana, and Ramirez-Cuesta, Anibal J. Tue .
"Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst". United States. https://doi.org/10.1021/jacs.7b05492. https://www.osti.gov/servlets/purl/1376480.
@article{osti_1376480,
title = {Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst},
author = {Wu, Zili and Cheng, Yongqiang and Tao, Franklin and Daemen, Luke and Foo, Guo Shiou and Nguyen, Luan and Zhang, Xiaoyan and Beste, Ariana and Ramirez-Cuesta, Anibal J.},
abstractNote = {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.},
doi = {10.1021/jacs.7b05492},
journal = {Journal of the American Chemical Society},
number = 28,
volume = 139,
place = {United States},
year = {Tue Jun 27 00:00:00 EDT 2017},
month = {Tue Jun 27 00:00:00 EDT 2017}
}
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