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Ammonia decomposition catalysis using lithium-calcium imide

DOI: 10.1039/C5FD00179J DOI Help

Authors: Joshua William Makepeace (University of Oxford) , Hazel M. A Hunter (ISIS) , Thomas J Wood (ISIS) , Ronald I Smith (ISIS) , Claire A. Murray (Diamond Light Source) , William I. F. David (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Faraday Discussions

State: Published (Approved)
Published: December 2015
Diamond Proposal Number(s): 11298

Abstract: Lithium-calcium imide is explored as a catalyst for the decomposition of ammonia. It shows the highest ammonia decomposition activity yet reported for a pure light metal amide or imide, comparable to lithium imide-amide at high temperature, with superior conversion observed at lower temperatures. Importantly, the mass recovery of lithium-calcium imide is almost complete, indicating that it may be easier to contain than the other amide-imide catalysts reported to date. The basis of this improved recovery is that the catalyst is, at least, partially solid across the temperature range studied under ammonia flow. However, lithium-calcium imide itself is only stable at low and high temperatures under ammonia, with in-situ powder diffraction showing the decomposition of the catalyst to lithium amide-imide and calcium imide at intermediate temperatures of 200–460 °C.

Subject Areas: Energy, Chemistry

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ISIS