Ammonia decomposition catalysis using non-stoichiometric lithium imide

Joshua W. Makepeace, Thomas J. Wood, Hazel M A Hunter, Martin O. Jones, William I F David*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

We demonstrate that non-stoichiometric lithium imide is a highly active catalyst for the production of high-purity hydrogen from ammonia, with superior ammonia decomposition activity to a number of other catalyst materials. Neutron powder diffraction measurements reveal that the catalyst deviates from pure imide stoichiometry under ammonia flow, with active catalytic behaviour observed across a range of stoichiometry values near the imide. These measurements also show that hydrogen from the ammonia is exchanged with, and incorporated into, the bulk catalyst material, in a significant departure from existing ammonia decomposition catalysts. The efficacy of the lithium imide-amide system not only represents a more promising catalyst system, but also broadens the range of candidates for amide-based ammonia decomposition to include those that form imides. is

Original languageEnglish
Pages (from-to)3805-3815
Number of pages11
JournalChemical Science
Volume6
Issue number7
DOIs
Publication statusPublished - 1 Jul 2015

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