AI Article Synopsis
- Lithium-calcium imide is found to be an effective catalyst for ammonia decomposition, showing superior activity at lower temperatures compared to other light metal amide or imide catalysts.
- The catalyst demonstrates nearly complete mass recovery after reactions, making it easier to manage than existing amide-imide catalysts.
- However, its stability is limited, as it decomposes into lithium amide-imide and calcium imide at intermediate temperatures between 200-460 °C.
Article 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 post-reaction 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.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c5fd00179j | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ammonia decomposition catalysis using lithium-calcium imide.
Faraday Discuss
July 2016
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK and ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.
Article Synopsis
- Lithium-calcium imide is found to be an effective catalyst for ammonia decomposition, showing superior activity at lower temperatures compared to other light metal amide or imide catalysts.
- The catalyst demonstrates nearly complete mass recovery after reactions, making it easier to manage than existing amide-imide catalysts.
- However, its stability is limited, as it decomposes into lithium amide-imide and calcium imide at intermediate temperatures between 200-460 °C.
Lithium calcium imide [Li2Ca(NH)2] for hydrogen storage: structural and thermodynamic properties.
J Phys Chem B
September 2008
Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
In an attempt to tailor the dehydrogenation temperature of lithium imides, we have investigated the ternary imide Li 2Ca(NH) 2, which crystallizes in a structure (space group P3 m1) different from that of Li 2Mg(NH) 2 (space group Iba2). First-principles density functional calculations yield the stable ground-state structure along with the correct hydrogen positions. Compared with the structural and thermodynamic data of the pure lithium imides, those Ca or Mg partially substituted ternary imides show decreased reaction enthalpies as well as dehydrogenation temperatures.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!