This book describes important findings in intensive studies conducted in Japan on ammonia as an energy carrier. It illustrates an advanced solar-heat capture system and storage materials at 600°C and hydrogen production with SOECs and a new IS method through the use of heat. New industrial ammonia catalysts and a demonstration process that started running in Fukushima are also introduced. Advanced ammonia decomposition catalysts and the process that were developed for use by the hydrogen station are presented. An advanced direct ammonia fuel cell was developed and the base data are shown. The book explains that ammonia is used as a fuel for industrial applications because its burning can be controlled without emitting extra NOx in the gas turbine and the real coal co-fired power plant. These breakthroughs have made a strong impact in the world as a practical technology for CO2 reduction. Also provided here are the scientific and industrial backgrounds as well as the environmental assessment and economic evaluation for the future.This book will be helpful for all who are interested in energy technology—researchers, students, and strategy planners at companies and in the government.