2H₂+O₂→gives2H₂O

Species

Also stated as each of 2 H2 + O2 ⇌ 2 H2O, 2 H2O → 2 H2 + O2 (reversible and irreversible statements are kept apart).

In the processes

9 statements in 6 processes: a process may state the reaction more than once (both ways, or at another scale).

• Acetylene by partial oxidation of natural gas with NMP recovery (6.25 t/h, synthesis-gas co-product)Concept · not reviewed

  H2_COMB2 H2 + O2 → 2 H2O

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  41.37 % of O2 (assumed: scripts/balance.py: extent that leaves 56 vol% H2 (US8975460B2) by the hydrogen balance, D-005)

  Heat of reaction

  ΔH = -483,644 kJ/kmol at 298.15 K, as written (calculated: ideal-gas formation enthalpies of materials.yaml (ATcT), 298.15 K)

• Ammonia from natural gas (1500 t/d, steam reforming with air-fed secondary reformer, Haber-Bosch loop)Concept · not reviewed

  H2_OX2 H2 + O2 → 2 H2O

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of O2 (given: Al-Dhfeery and Jassem (2012), Modeling and simulation of an industrial secondary reformer reactor in the fertilizer plants, Int. J. Ind. Chem. 3:14, doi:10.1186/2228-5547-3-14, p. 2 (combustion zone): complete oxygen consumption in the combustion zone; the model is compared with the Basra plant's data in Table 2 (D-034))

• Ammonia from natural gas (1500 t/d, steam reforming with air-fed secondary reformer, Haber-Bosch loop)Concept · not reviewed

  H2_COMB2 H2 + O2 → 2 H2O

  Scale

  Written at 0.5 times the scale

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of H2 (given: design basis of complete combustion with excess air, the standard combustion calculation of fired equipment (owner's decision I-006, 2026-10-30, D-040): D. Schmitt, Correctly modeling and calculating combustion efficiencies in fired equipment, American Flame Research Committee (AFRC) paper, Increase Performance Inc., Tulsa, University of Utah digital library ark:/87278/s6fc0529, pp. 1-6: the combustion calculation of a reformer furnace of hydrogen and ammonia plants burns every fuel component, hydrogen included, by its combustion equation to CO2 and H2O at the set excess air (no CO or unburnt fuel in the flue gas of the worked example); US EPA Method 19, 40 CFR Part 60 Appendix A-7, section 12.3.2.1, Eq. 19-13: the F factors are the stoichiometric products of complete combustion of the fuel's H, C, S, N and O. The furnace runs with 10 % excess O2 (D-014). Superseded S5b basis: an inference from Al-Dhfeery and Jassem (2012))

• Ethylene and propylene by ethane steam cracking (1000 kt/a ethylene, concept)Concept · not reviewed

  COMB_H2H2 + 0.5 O2 → H2O

  Scale

  Written at 0.5 times the scale

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of H2 (assumed: D-013: complete combustion)

• Hydrogen by natural-gas steam methane reforming with PSA (100 000 Nm3/h, steam export)Concept · not reviewed

  COMB_H2H2 + 0.5 O2 → H2O

  Scale

  Written at 0.5 times the scale

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of H2 (assumed: complete combustion (D-009))

  Heat of reaction

  ΔH = -241,822 kJ/kmol at 298.15 K, as written (given: standard formation enthalpies, 298.15 K (process/materials.yaml))

• Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)Concept · not reviewed

  O2_HYD2 H2 + O2 → 2 H2O

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  90 % of O2 (given: EP 0 945 401 (DOMO Caproleuna), Example: 90 % of the oxygen in the nitrous gas hydrogenated on a silver-manganese catalyst (D-005))

  Heat of reaction

  ΔH = -483,644 kJ/kmol at 298.15 K, as written (given: ideal-gas enthalpies of formation at 298 K (chemicals 1.5.2): 2 x -241.82 kJ/mol H2O(g))

  Catalyst

  Ag-Mn (EP 0 945 401)

• Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)Concept · not reviewed

  H2_COMB2 H2 + O2 → 2 H2O

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of H2 (assumed: D-009: complete combustion of the purge hydrogen with excess air at 1173 K)

  Heat of reaction

  ΔH = -483,644 kJ/kmol at 298.15 K, as written (given: ideal-gas enthalpies of formation at 298 K (chemicals 1.5.2))

• Solid sodium cyanide from Andrussow HCN (6.25 t/h, 50 kt/a)Concept · not reviewed

  H2_OXH2 + 1/2 O2 → H2O

  Scale

  Written at 0.5 times the scale

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  6.904 % of O2 (assumed: scripts/nacn_balance.py: burns the oxygen left by the other reactions down to 0.1 % of the O2 fed (oxygen conversion practically complete, US 6,596,251 B2 background; D-004))

  Catalyst

  Platinum-rhodium (90/10) gauze pack · active phase Pt-Rh

  Operating window

  1,223.2–1,473.2 K (950–1,200 °C), 100–200 kPa (1–2 bar) (given: temperature: US 6,596,251 B2 (Degussa, 2003), detailed description: reaction temperature 950-1200 C, the background naming Pt with 10 % Rh gauzes at about 980-1050 C in air operation; pressure: near-atmospheric operation of the converter, ASSUMED (no open source read in this run gives a pressure))

  Poisons

  iron, sulfur compounds

• Solid sodium cyanide from Andrussow HCN (6.25 t/h, 50 kt/a)Concept · not reviewed

  H2_COMBH2 + 1/2 O2 → H2O

  Scale

  Written at 0.5 times the scale

  Stated as

  Fixed conversion

  Element balance

  Balances in every element

  Conversion

  100 % of H2 (assumed: D-009: complete combustion)

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

1. scripts/balance.py: extent that leaves 56 vol% H2 (US8975460B2) by the hydrogen balance, D-005

   For the conversion · cited by Acetylene by partial oxidation of natural gas with NMP recovery (6.25 t/h, synthesis-gas co-product)

2. ideal-gas formation enthalpies of materials.yaml (ATcT), 298.15 K

   For the heat of reaction · cited by Acetylene by partial oxidation of natural gas with NMP recovery (6.25 t/h, synthesis-gas co-product)

3. Al-Dhfeery and Jassem (2012), Modeling and simulation of an industrial secondary reformer reactor in the fertilizer plants, Int. J. Ind. Chem. 3:14, doi:10.1186/2228-5547-3-14, p. 2 (combustion zone): complete oxygen consumption in the combustion zone; the model is compared with the Basra plant's data in Table 2 (D-034)

   For the conversion · cited by Ammonia from natural gas (1500 t/d, steam reforming with air-fed secondary reformer, Haber-Bosch loop)

4. design basis of complete combustion with excess air, the standard combustion calculation of fired equipment (owner's decision I-006, 2026-10-30, D-040): D. Schmitt, Correctly modeling and calculating combustion efficiencies in fired equipment, American Flame Research Committee (AFRC) paper, Increase Performance Inc., Tulsa, University of Utah digital library ark:/87278/s6fc0529, pp. 1-6: the combustion calculation of a reformer furnace of hydrogen and ammonia plants burns every fuel component, hydrogen included, by its combustion equation to CO2 and H2O at the set excess air (no CO or unburnt fuel in the flue gas of the worked example); US EPA Method 19, 40 CFR Part 60 Appendix A-7, section 12.3.2.1, Eq. 19-13: the F factors are the stoichiometric products of complete combustion of the fuel's H, C, S, N and O. The furnace runs with 10 % excess O2 (D-014). Superseded S5b basis: an inference from Al-Dhfeery and Jassem (2012)

   For the conversion · cited by Ammonia from natural gas (1500 t/d, steam reforming with air-fed secondary reformer, Haber-Bosch loop)

5. D-013: complete combustion

   For the conversion · cited by Ethylene and propylene by ethane steam cracking (1000 kt/a ethylene, concept)

6. complete combustion (D-009)

   For the conversion · cited by Hydrogen by natural-gas steam methane reforming with PSA (100 000 Nm3/h, steam export)

7. standard formation enthalpies, 298.15 K (process/materials.yaml)

   For the heat of reaction · cited by Hydrogen by natural-gas steam methane reforming with PSA (100 000 Nm3/h, steam export)

8. EP 0 945 401

   For the reaction · cited by Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)

9. EP 0 945 401 (DOMO Caproleuna), Example: 90 % of the oxygen in the nitrous gas hydrogenated on a silver-manganese catalyst (D-005)

   For the conversion · cited by Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)

10. ideal-gas enthalpies of formation at 298 K (chemicals 1.5.2): 2 x -241.82 kJ/mol H2O(g)

    For the heat of reaction · cited by Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)

11. D-009: complete combustion of the purge hydrogen with excess air at 1173 K

    For the conversion · cited by Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)

12. ideal-gas enthalpies of formation at 298 K (chemicals 1.5.2)

    For the heat of reaction · cited by Hydroxylammonium sulfate by catalytic NO hydrogenation (30 kt/a NH2OH, 25 wt% solution)

13. scripts/nacn_balance.py: burns the oxygen left by the other reactions down to 0.1 % of the O2 fed (oxygen conversion practically complete, US 6,596,251 B2 background; D-004)

    For the conversion · cited by Solid sodium cyanide from Andrussow HCN (6.25 t/h, 50 kt/a)

14. US 6,596,251 B2 (Degussa, 2003), background and examples (Pt/Rh10 gauze, 6 layers in the laboratory reactor)

    For the catalyst · cited by Solid sodium cyanide from Andrussow HCN (6.25 t/h, 50 kt/a)

15. D-009: complete combustion

    For the conversion · cited by Solid sodium cyanide from Andrussow HCN (6.25 t/h, 50 kt/a)