Review of the Decomposition of Ammonia to Generate Hydrogen

2021/05/21 by Ilaria Lucentini, Xènia Garcia, Xavier Vendrell +1 · 10 citations
Chemical Engineering · Materials Science · #Ammonia Synthesis and Nitrogen Reduction #Catalytic Processes in Materials Science #Hydrogen Storage and Materials

paper · doi:10.1021/acs.iecr.1c00843

openalex publication_date 2021/05/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

Because of the problems associated with the generation and storage of hydrogen in portable applications, the use of ammonia has been proposed for on-site production of hydrogen through ammonia decomposition. First, an analysis of the existing systems for ammonia decomposition and the challenges for this technology are presented. Then, the state of the art of the catalysts used to date for ammonia decomposition is described considering the catalysts composed of noble and non-noble metals and their combinations, as well as novel materials such as alkali metal amides and imides. The effect of the supports and promoters used is analyzed in detail, and the catalytic activity obtained is compared. An analysis of the kinetics of the reaction obtained with different catalysts is also presented and discussed, including the reaction mechanism, the determining step of the reaction, and the apparent activation energy. Finally, the structured reactors used to date for the decomposition reaction of ammonia are explored, as well as the possibilities offered by catalytic membrane reactors, which allow the on-site simultaneous production and separation of hydrogen.

Citations

• Hydrogen storage methods
• Ammonia decomposition over Ru and Ni catalysts supported on fumed SiO2, MCM-41, and SBA-15
• Hydrogen Production From Water Electrolysis: Current Status and Future Trends
• The Hydrogen Economy
• Ammonia decomposition in the presence of water vapor II. Kinetics of the reaction on nickel catalyst
• Why the optimal ammonia synthesis catalyst is not the optimal ammonia decomposition catalyst

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