Oxygen‐Doped γ‐Mo <sub>2</sub> N as High‐Performance Catalyst for Ammonia Decomposition

γ-Mo<sub>2</sub>N catalysts exhibit excellent activity and stability in ammonia decomposition reactions. However, the influence of oxygen on its activity is still unknown. In this work, two γ-Mo<sub>2</sub>N catalysts with different oxygen content are synthesized using temperature-programmed nitridation of α-MoO<sub>3</sub>. The γ-Mo<sub>2</sub>N catalysts are highly oxidized and their ammonia decomposition performance is closely related to their oxygen content. The activity of γ-Mo<sub>2</sub>N with high oxygen content (HO-γ-Mo<sub>2</sub>N) is much higher, whose H<sub>2</sub> formation rate at 550 °C is 3.3 times higher than the γ-Mo<sub>2</sub>N with low oxygen content (LO-γ-Mo<sub>2</sub>N). This is mainly attributed to two aspects: on the one hand, the higher valence state of Mo in the HO-γ-Mo<sub>2</sub>N leads to stronger Mo─NH<sub>3</sub> bonds, which promotes the adsorption and activation of NH<sub>3</sub>. On the other hand, the H generated by N─H bond breaking is more easily migrated to O, which avoids excessive H occupying the γ-Mo<sub>2</sub>N active sites and alleviates the negative effect of hydrogen poisoning.

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Publication Details

Journal
Small
Published
2025-02-16
DOI
https://doi.org/10.1002/smll.202410803
Primary Topic
MXene and MAX Phase Materials
Type
article
Field-Weighted Citation Impact
0.00

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article

Oxygen‐Doped γ‐Mo 2 N as High‐Performance Catalyst for Ammonia Decomposition

Shuyan Song, Xiang‐Ping Chu, Yi Shi, Baokang Geng et al.
Small
MXene and MAX Phase Materials
article

Oxygen‐Doped γ‐Mo 2 N as High‐Performance Catalyst for Ammonia Decomposition

Shuyan Song, Xiang‐Ping Chu, Yi Shi, Baokang Geng, Xiao Wang, Lingling Zhang, Li Liu, Hongjie Zhang, Ruize Jiang, Shibo Zhang
article en

Abstract

γ-Mo<sub>2</sub>N catalysts exhibit excellent activity and stability in ammonia decomposition reactions. However, the influence of oxygen on its activity is still unknown. In this work, two γ-Mo<sub>2</sub>N catalysts with different oxygen content are synthesized using temperature-programmed nitridation of α-MoO<sub>3</sub>. The γ-Mo<sub>2</sub>N catalysts are highly oxidized and their ammonia decomposition performance is closely related to their oxygen content. The activity of γ-Mo<sub>2</sub>N with high oxygen content (HO-γ-Mo<sub>2</sub>N) is much higher, whose H<sub>2</sub> formation rate at 550 °C is 3.3 times higher than the γ-Mo<sub>2</sub>N with low oxygen content (LO-γ-Mo<sub>2</sub>N). This is mainly attributed to two aspects: on the one hand, the higher valence state of Mo in the HO-γ-Mo<sub>2</sub>N leads to stronger Mo─NH<sub>3</sub> bonds, which promotes the adsorption and activation of NH<sub>3</sub>. On the other hand, the H generated by N─H bond breaking is more easily migrated to O, which avoids excessive H occupying the γ-Mo<sub>2</sub>N active sites and alleviates the negative effect of hydrogen poisoning.

SmallVol. 21(12)
University of Science and Technology of China (CN), Chinese Academy of Sciences (CN), Changchun Institute of Applied Chemistry (CN), Tsinghua University (CN)
National Natural Science Foundation of China, People's Government of Jilin Province, National Science and Technology Major Project
Clean water and sanitation
Openalex Percentile: Top 98%
MXene and MAX Phase Materials
DOIOpen Access PDFOpenAlex
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