Adsorption and activation of dinitrogen (N2) is an indispensable process in nitrogen fixation. Metal nitride species continue to attract attention as a promising catalyst for ammonia synthesis. However, the detailed mechanisms at a molecular level between reactive nitride species and N2 remain unclear at elevated temperature, which is important to understand the temperature effect and narrow the gap between the gas phase system and condensed phase system. Herein, the 14N/15N isotopic exchange in the reaction between tantalum nitride cluster anions Ta314N3− and 15N2 leading to the regeneration of 14N2/14N15N was observed at elevated temperature (393−593 K) using mass spectrometry. With the aid of theoretical calculations, the exchange mechanism and the effect of temperature to promote the dissociation of N2 on Ta3N3− were elucidated. A comparison experiment for Ta314N4−/15N2 couple indicated that only desorption of 15N2 from Ta314N415N2− took place at elevated temperature. The different exchange behavior can be well understood by the fact that nitrogen vacancy is a requisite for the dinitrogen activation over metal nitride species. This study may shed light on understanding the role of nitrogen vacancy in nitride species for ammonia synthesis and provide clues in designing effective catalysts for nitrogen fixation.
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February 2022
Research Article|
February 01 2022
15 N/14N isotopic exchange in the dissociative adsorption of N2 on tantalum nitride cluster anions Ta3N3−†
Zi-Yu Li;
Zi-Yu Li
a
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, China
c
Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences
, Beijing 100190, China
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Li-Hui Mou;
Li-Hui Mou
a
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, China
b
University of Chinese Academy of Sciences
, Beijing 100049, China
c
Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences
, Beijing 100190, China
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Gui-Duo Jiang;
Gui-Duo Jiang
a
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, China
b
University of Chinese Academy of Sciences
, Beijing 100049, China
c
Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences
, Beijing 100190, China
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Qing-Yu Liu;
Qing-Yu Liu
a
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, China
c
Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences
, Beijing 100190, China
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Sheng-Gui He
Sheng-Gui He
*
a
State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, China
b
University of Chinese Academy of Sciences
, Beijing 100049, China
c
Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences
, Beijing 100190, China
*Author to whom correspondence should be addressed. E-mail: [email protected]
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*Author to whom correspondence should be addressed. E-mail: [email protected]
†
Part of Special Issue “In Memory of Prof. Nanquan Lou on the occasion of his 100th anniversary”.
Chin. J. Chem. Phys. 35, 77–85 (2022)
Article history
Received:
December 17 2021
Accepted:
January 10 2022
Citation
Zi-Yu Li, Li-Hui Mou, Gui-Duo Jiang, Qing-Yu Liu, Sheng-Gui He; 15 N/14N isotopic exchange in the dissociative adsorption of N2 on tantalum nitride cluster anions Ta3N3−. Chin. J. Chem. Phys. 1 February 2022; 35 (1): 77–85. https://doi.org/10.1063/1674-0068/cjcp2112286
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