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

DOI: 10.1039/C8CP02824A DOI Help

Authors: Joshua W. Makepeace (ISIS Pulsed Neutron and Muon Facility) , Thomas J. Wood (ISIS Pulsed Neutron and Muon Facility) , Phillip L. Marks (University of Oxford; ISIS Pulsed Neutron and Muon Facility) , Ronald I. Smith (ISIS Pulsed Neutron and Muon Facility) , Claire Murray (Diamond Light Source) , William I. F. David (University of Oxford; ISIS Pulsed Neutron and Muon Facility)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics , VOL 1

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 15226

Open Access Open Access

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.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ISIS


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