Conventional ammonia production emits about 1.6 to 2.0 tonnes of carbon dioxide per tonne of ammonia through the use of “grey” hydrogen, and the sector accounts for roughly 1 to 2 percent of global carbon emissions. The industry is now shifting from grey to electrolytic “green” ammonia, unlocking low-carbon fertilizer production and emerging maritime fuel applications. Asia holds strong potential because fertilizer demand, bunkering hubs, and low-cost renewable energy resources are co-located. In the near term, blue ammonia can serve as a bridge in gas-rich countries such as Malaysia and Indonesia, provided methane leakage is tightly managed and carbon capture rates exceed 90 to 95 percent.
Green ammonia in Asia will center on renewable-powered electrolysis to produce hydrogen, nitrogen derived from air separation, and a flexible, fully electrified Haber-Bosch synthesis loop. Alkaline and proton exchange membrane electrolysis currently operate at about 48 to 55 kilowatt hours per kilogram of hydrogen, while solid oxide electrolysis cells become attractive where 600 to 800 degree Celsius waste heat is available. Proton exchange membrane systems suit variable renewable power in India, Vietnam, and Indonesia, whereas solid oxide systems fit heat-intensive clusters in China, Japan, and Korea. Modular pressure swing adsorption or membrane units combined with compact Haber-Bosch systems are suitable near ports in Malaysia, Indonesia, and Vietnam.
Successful deployment depends on high recovery desalination for coastal projects, refrigerated storage and export terminals, ammonia cracking infrastructure for hydrogen imports into Japan and Korea, robust nitrogen oxide controls for maritime fuel use in hubs such as Singapore, and credible well-to-gate carbon intensity certification to unlock fertilizer and shipping market premiums.
