Where does the first step of industrial synthetic ammonia production come from?

Hydrogen in the first step of industrial ammonia production does not come from water. Preparation of hydrogen for synthetic ammonia: Natural gas (taking its methane component), liquefied petroleum gas (taking its propane and butane component) and petroleum (taking its naphtha and other hydrocarbons) can be used to make raw hydrogen for synthetic ammonia. The first step is to remove sulfide from the raw material, because sulfide will poison the catalyst used in Haber-Bosch process. Catalytic hydrogenation can change organic sulfide into hydrogen sulfide: hydrogen sulfide produced by H2+RSH → RH+H2S(g) will be absorbed by zinc oxide and become water, and zinc sulfide: H2S+ZnO → ZnS+H2O will react with water under the catalysis of nickel. Desulfurized hydrocarbons (such as methane) are converted into a mixture of hydrogen and carbon monoxide: CH4+H2O → CO+3 H2 Carbon monoxide reacts with water and is converted into carbon dioxide, producing more hydrogen: CO+H2O → CO2+H2 (reversible reaction). Next, carbon dioxide can be absorbed by 2- aminoethanol solution or removed by pressure swing adsorption (PSA). The last step of preparing hydrogen is to remove a small amount of residual carbon monoxide and carbon dioxide in hydrogen by methanation using a catalyst: Co+3H2→ CH4+H2O CO2+4h2 → CH4+H2O steam reforming, carbon monoxide conversion, carbon dioxide removal and methanation are carried out at a pressure of 25-35pa.