Green ammonia production technologies: A review of practical progress.

[Display omitted] • Conventional H–B process with process optimization and CCSU technology is a near-term option. • Sustainable N-fertilizer that relies on air and water could revolutionize the agriculture business. • Data from demonstration plants would accelerate scale-up and market trend analysis. • Cost of electrolysis-driven HB ammonia is competitive with traditional technology in some regions. • Simultaneously achieving DOE target ammonia yield and energy efficiency remains elusive. [ABSTRACT FROM AUTHOR]