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Issue 35, 2018
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Bulk phase behavior of lithium imide–metal nitride ammonia decomposition catalysts

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Abstract

Lithium imide is a promising new catalyst for the production of hydrogen from ammonia. Its catalytic activity has been reported to be significantly enhanced through its use as a composite with various transition metal nitrides. In this work, two of these composite catalysts (with manganese nitride and iron nitride) were examined using in situ neutron and X-ray powder diffraction experiments in order to explore the bulk phases present during ammonia decomposition. Under such conditions, the iron composite was found to be a mixture of lithium imide and iron metal, while the manganese composite contained lithium imide and manganese nitride at low temperatures, and a mixture of lithium imide and two ternary lithium–manganese nitrides (LixMn2−xN and a small proportion of Li7MnN4) at higher temperatures. The results indicate that the bulk formation of a ternary nitride is not necessary for ammonia decomposition in lithium imide–transition metal catalyst systems.

Graphical abstract: Bulk phase behavior of lithium imide–metal nitride ammonia decomposition catalysts

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Publication details

The article was received on 03 May 2018, accepted on 31 Jul 2018 and first published on 23 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP02824A
Citation: Phys. Chem. Chem. Phys., 2018,20, 22689-22697
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    Bulk phase behavior of lithium imide–metal nitride ammonia decomposition catalysts

    J. W. Makepeace, T. J. Wood, P. L. Marks, R. I. Smith, C. A. Murray and W. I. F. David, Phys. Chem. Chem. Phys., 2018, 20, 22689
    DOI: 10.1039/C8CP02824A

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