Promotion effects of different methods in COx-free hydrogen production from ammonia decomposition

Ammonia can be decomposed to produce exclusively hydrogen and nitrogen so that it could function as a means for hydrogen storage. In situ hydrogen production from ammonia decomposition can effectively meet the challenges of hydrogen storage and transport. The specific energy cost of in situ hydrogen production from ammonia is lower than that of common energy sources, such as liquefied petroleum gas (LPG). Among the noble metal and non-noble metal components, Ru and Ni catalysts are the most worthy of study. Metal carbides, metal nitrides, and perovskites also have considerable potential. In addition, improving the structure or composition of the support to enhance the performance of catalysts is also a worthy research topic. Now, electrocatalytic and photocatalytic ammonia decomposition technology is also developing in full swing. Membrane reactors can integrate ammonia decomposition and hydrogen separation processes, which could attract researchers to optimize the process from various aspects. The present situation and future challenges of ammonia decomposition are also explored as to how to further reduce the ammonia decomposition temperature.