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Updated: Feb 17, 2026
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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
Published on: August 23, 2018
9.5K
Study on Nitrogenation Reaction Mechanism in Li-Sn Alloy by Observation of Microstructural Change
Shigehito Isobe1, Masahiro Kamisawa2, Hiroki Miyaoka3
1Faculty of Engineering, Hokkaido University N-13, W-8, Sapporo 060-8628, Japan.
ACS Omega
|February 16, 2026
Summary
Ammonia synthesis using lithium-tin (Li-Sn) alloys involves surface lithium nitride formation. Lithium atom diffusion, not nitrogen penetration, drives this process, with Li diffusion in the surface phase being rate-limiting.
Area of Science:
- Materials Science
- Chemical Engineering
- Catalysis
Background:
- Ammonia synthesis is crucial for agriculture and industry.
- Understanding reaction mechanisms is key to optimizing catalytic processes.
- Lithium-tin (Li-Sn) alloys are explored as potential catalysts for nitrogen fixation.
Purpose of the Study:
- To investigate the reaction mechanism of ammonia synthesis using Li-Sn alloys.
- To elucidate the role of microstructural changes during the nitrogenation reaction.
- To determine the rate-limiting step in the formation of lithium nitride.
Main Methods:
- Microstructural analysis of bulk Li-Sn alloys.
- Energy-dispersive X-ray spectroscopy (EDS) to analyze elemental composition.
- Calculation of activation energy using Arrhenius plots.
Main Results:
- Nitrogenation forms lithium nitride at the alloy surface.
- EDS confirmed nitrogen presence at the surface and decreased tin concentration towards the surface.
- Nitrogen atoms do not penetrate the bulk Li-Sn alloy; growth occurs via outward lithium diffusion.
Conclusions:
- The nitrogenation reaction proceeds through the diffusion of lithium atoms.
- Lithium diffusion within the surface phase is identified as the rate-limiting step.
- The study clarifies the mechanism of lithium nitride formation on Li-Sn alloys.
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