for AIChE-2026, #1

Zero-carbon hydrogen production by thermo-chemical water splitting. Abstract. Synergy of (1) New kind of catalysts. It is an reversible circular reaction (catalyst in wide sense), that is added to a target reaction to form a joint process. (2) Wind and solar energy can be in order of magnitude cheapened. For example, the water thermolysis at breakthrough lower temperature is estimated just below. (1) Catalyst is 0.5 * N2 + 1.5 * H2 = NH3 is joined with 0.365 mol of the water splitting, it gives a heat in electricity as a by-product and 0.365 mol of H2 at T > 770 Celsius, vs. conventional 2500 C. Because all reagents are circular and so practically free, the hydrogen OPEX cost is a cost of energy consumed, so a heat of (55 + 0.365 * 248) kJ = 145 kJ /0.365 = 400 kJ/mol minus a cost of the sold electricity, and with a Capex of USD 67/ 0.73 = 90/ton H2, it is in sum about USD 170 ton H2. (2) Catalyst: CO2 + H2 = HCOOH - formic acid. Joint target reaction: HCOOH + 0.4 * (H2O = H2 + 0.5 O2) + CO2 + H2. dH = 32 + 0.4 * 242 = 128 kJ. dS = 214 + 0.4 * (131 + 102 - 180) = 234. dG = 128 - 234 * T < 0, and T > 274 C. Because all reagents here are circular and practically free, so Opex cost of the hydrogen is about USD 70 /ton H2. 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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