Lithium Imide Synergy with 3d Transition‐Metal Nitrides Leading to Unprecedented Catalytic Activities for Ammonia Decomposition |
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| Authors: | Jianping Guo Peikun Wang Prof?Dr Guotao Wu Prof?Dr Anan Wu Daqiang Hu Prof?Dr Zhitao Xiong Prof?Dr Junhu Wang Pei Yu Fei Chang Zheng Chen Prof?Dr Ping Chen |
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| Institution: | 1. Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (P. R. China) http://www.imide.dicp.ac.cn;2. State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P. R. China) |
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| 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 Li2NH? MnN 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 TM? N bonding and thus alters the reaction energetics. |
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| Keywords: | ammonia decomposition electronic promoter heterogeneous catalysis lithium imide nitrides |
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