Journal
CATALYSTS
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/catal8100437
Keywords
plasma catalysis; gallium; indium; Ga-In alloys; radiofrequency plasma; ammonia synthesis
Categories
Funding
- University of Tulsa
- University of Tulsa Faculty Development Summer Fellowship Program
- Office of Research and Sponsored Programs at the University of Tulsa
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The Haber-Bosch process has been the commercial benchmark process for ammonia synthesis for more than a century. Plasma-catalytic synthesis for ammonia production is theorized to have a great potential for being a greener alternative to the Haber-Bosch process. However, the underlying reactions for ammonia synthesis still require some detailed study especially for radiofrequency plasmas. Herein, the use of inductively coupled radiofrequency plasma for the synthesis of ammonia when employing Ga, In and their alloys as catalysts is presented. The plasma is characterized using emission spectroscopy and the surface of catalysts using Scanning Electron Microscope. A maximum energy yield of 0.31 g-NH3/kWh and energy cost of 196 MJ/mol is achieved with Ga-In (0.6:0.4 and 0.2:0.8) alloy at 50 W plasma power. Granular nodes are observed on the surface of catalysts indicating the formation of the intermediate GaN.
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