The water thermolysis by NH3 circular.

June 12, 2026 (1) N2 + 3 H2 = 2 NH3 is circular, so practically free. dH = -92 kJ /mol, dS = - 200 J/mol * K. T < 92 / 200 = 190 C. (2) 2 NH3 + T * k (H2O = H2 + 0.5 * O2) + N2 + 3 N2. dG = 92 + k * 242 - T * (200 + k * (131 + 102 - 180)) /1000 < 0 for spontaneous reaction, and if k = 0.4, so T > 580 C. A cost of the hydrogen of the water thermolysis is a cost of the heat for reaction (2) minus a cost of electricity as a by-product of exothermic reaction (1) and totally such hydrogen product is practically free too. Really, if heat is USD 0.004/kWh, [1], and heat in electricity is 0.25 effective, and USD 0.03 /kWh sold, so USD (210 - 200) = 10 / (2 * 0.4) = USD 12.5 /ton H2 product is negligible OPEX.

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