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- Title
Lithium Imide Synergy with 3d Transition-Metal Nitrides Leading to Unprecedented Catalytic Activities for Ammonia Decomposition.
- Authors
Guo, Jianping; Wang, Peikun; Wu, Guotao; Wu, Anan; Hu, Daqiang; Xiong, Zhitao; Wang, Junhu; Yu, Pei; Chang, Fei; Chen, Zheng; Chen, Ping
- Abstract
Alkali metals have been widely employed as catalyst promoters; however, the promoting mechanism remains essentially unclear. Li, when in the imide form, is shown to synergize with 3d transition metals or their nitrides TM(N) spreading from Ti to Cu, leading to universal and unprecedentedly high catalytic activities in NH3 decomposition, among which Li2NHMnN has an activity superior to that of the highly active Ru/carbon nanotube catalyst. The catalysis is fulfilled via the two-step cycle comprising: 1) the reaction of Li2NH and 3d TM(N) to form ternary nitride of LiTMN and H2, and 2) the ammoniation of LiTMN to Li2NH, TM(N) and N2 resulting in the neat reaction of 2 NH3⇌N2+3 H2. Li2NH, as an NH3 transmitting agent, favors the formation of higher N-content intermediate (LiTMN), where Li executes inductive effect to stabilize the TMN bonding and thus alters the reaction energetics.
- Subjects
TRANSITION metal nitrides; LITHIUM; AMMONIA; CATALYTIC activity; CATALYST supports; CARBON nanotubes; HETEROGENEOUS catalysis
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 10, p2993
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201410773