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Highly Active MnN-Li2NH Composite Catalyst for Producing COx-Free Hydrogen
Guo, Jianping1,2; Chang, Fei1,2; Wang, Peikun1,2; Hu, Daqiang1; Yu, Pei1,2; Wu, Guotao1; Xiong, Zhitao1; Chen, Ping1,3
KeywordManganese Nitride Lithium Imide Ternary Lithium Nitride Ammonia Decomposition Heterogeneous Catalysis
Source PublicationACS CATALYSIS
2015-05-01
DOI10.1021/acscatal.5b00278
Volume5Issue:5Pages:2708-2713
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordFUEL-CELL APPLICATIONS ; X-RAY-DIFFRACTION ; AMMONIA DECOMPOSITION ; 1ST PRINCIPLES ; HETEROGENEOUS CATALYSIS ; BIMETALLIC CATALYSTS ; CRYSTAL-STRUCTURE ; METAL NITRIDES ; NANOPARTICLES ; GENERATION
AbstractWe report on the significant synergistic effect of Li2NH on MnN in catalyzing NH3 decomposition to produce COx-free hydrogen. The MnNLi2NH exhibits catalytic activity below 623 K and reaches a hydrogen production rate of 37.5 mmolH(2) g(cat)(-1) min(-1) at 773 K, which is similar to 40 times the MnN and even superior to the highly active Ru-based catalysts under the same conditions. The apparent activation energy of MnN-Li2NH is similar to that of Ru/CNTs. The stability of the MnN-Li2NH composite catalyst depends on the molar ratio of MnN and Li2NH, and the catalyst with higher Mn content shows better stability. Our experimental results reveal that Li2NH reacts with MnN, giving rise to H-2 and Li7MnN4; Li7MnN4, on the other hand, can be easily ammoniated to give off N-2, which suggests that the catalysis is fulfilled via a redox cycle comprising (I) Li2NH + MnN -> Li7MnN4 + H-2 and (II) Li7MnN4 + NH3 -> MnN + Li2NH + N-2. The presence of Li2NH favors the formation of N-rich intermediate Li7MnN4, where Li+ executes a positive inductive effect to enhance the covalent Mn-N bonding and, therefore, leads to an altered reaction pathway and energetics. Our kinetic analyses indicate that the H-2 release step encounters a relatively higher barrier than the N-2 release step.
Language英语
WOS IDWOS:000354012200003
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146249
Collection中国科学院大连化学物理研究所
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Guo, Jianping,Chang, Fei,Wang, Peikun,et al. Highly Active MnN-Li2NH Composite Catalyst for Producing COx-Free Hydrogen[J]. ACS CATALYSIS,2015,5(5):2708-2713.
APA Guo, Jianping.,Chang, Fei.,Wang, Peikun.,Hu, Daqiang.,Yu, Pei.,...&Chen, Ping.(2015).Highly Active MnN-Li2NH Composite Catalyst for Producing COx-Free Hydrogen.ACS CATALYSIS,5(5),2708-2713.
MLA Guo, Jianping,et al."Highly Active MnN-Li2NH Composite Catalyst for Producing COx-Free Hydrogen".ACS CATALYSIS 5.5(2015):2708-2713.
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