Supercheap and green hydrogen production

(1) 0.5 N2 + 1.5 H2 = NH3. Enthalpy dH = - 46 kJ. Entropy dS = 76 (J / mol * K). so T < 320 C. (2) (NH3) + 0.5 * (H2O = H2 + 0.5 O2) + (0.5 N2 + 1.5 H2), dH = 167 kJ. dS = 218. So T > 490 C. Here, they are circular thermal splitting the water, so NH3 is practically free, and Opex cost of hydrogen is equal to a cost of energy is used. They are 46 kJ/mol heat in electricity as a by-product + 167 kJ/mol in reaction (2). (167 * 1.1 - 46 * 2.5) * 10^6 = USD 69 /ton H2. Note.Wind and solar energy can be in order of magnitude cheapened. See [1], [2], [3], [4], [5] etc. References. [1] Solar and Wind as cheap as 0.4 cent / kWh, judbarovski.blogspot.com/2025/02, posted on Feb. 11, 2025. [[2] Breakthrough cheap Re energy, davidjud.blogspot.com/2024/06, posted on June 21, 2024. [3] Rehab of solar thermal power plants, judbarovski.blogspot.com/2025/06, posted on June 02, 2025. [4] (745e) Fresh look on Wind power generation, AIChE Annual meeting, 2019 yr. [5] https://www.aiche.org/conferences-events, 2017 - 2024 years. [6] CV-2023, judbarovski.blogspot.com/2023/04, posted on April 27, 2023

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