Propulsion Chemistry



Here's a comprehensive list of chemical formulas used in propulsion, ranging from historical compositions to modern applications. I'll also provide information on discovery and usage where available.

Early and Historical Propellants

  1. Gunpowder (Black Powder)

    • Formula: 2 KNO₃ + S + 3 C → K₂S + 3 CO₂ + N₂

    • Origin: Developed in 9th-century China, it was the first known chemical propellant.

  2. Dynamite

    • Formula: Combustion of nitroglycerin, C₃H₅N₃O₉ → CO₂ + H₂O + N₂ + O₂ (simplified)

    • Discovery: Alfred Nobel, 1867.

Amateur Rocketry Propellants

  1. Sugar Rocket Fuel (Rocket Candy)

    • Formula: 65% KNO₃ + 35% C₁₂H₂₂O₁₁ (sucrose) → K₂CO₃ + CO₂ + H₂O (simplified oxidizer and fuel reaction)

    • Commonly used by amateur rocket enthusiasts due to its simplicity and availability.

  2. Potassium Nitrate and Sorbitol (KNSB)

    • Formula: 65% KNO₃ + 35% C₆H₁₄O₆ (sorbitol)

    • Known among hobbyists for being safer and more stable than traditional sugar rocket formulas.

Commercial and Modern Propellants

  1. Liquid Hydrogen and Liquid Oxygen (LH2/LOX)

    • Formula: 2 H₂ + O₂ → 2 H₂O

    • Usage: Prominently used in NASA’s Saturn V rocket and Space Shuttle main engines.

  2. Kerosene (RP-1) and Liquid Oxygen (LOX)

    • Formula: C₁₂H₂₆ + 18.5 O₂ → 12 CO₂ + 13 H₂O

    • Usage: Commonly used in Russian rockets such as the Soyuz, and by SpaceX's Falcon 9.

  3. Ammonium Perchlorate Composite Propellant (APCP)

    • Formula: 6 NH₄ClO₄ + 10 Al → 5 Al₂O₃ + 6 HCl + 3 N₂ + 9 H₂O

    • Usage: Widely used in solid rocket boosters of Space Shuttle and various missiles.

  4. Hydrazine

    • Formula: N₂H₄ is often used with an oxidizer like MON-3 (Mixed Oxides of Nitrogen: 97% N₂O₄, 3% NO)

    • Usage: Employed in satellite thrusters and as a hypergolic propellant in space missions.

  5. Hypergolic Propellant (Aerozine 50 and Nitrogen Tetroxide)

    • Formula: (A mixture of unsymmetrical dimethylhydrazine and hydrazine, usually noted as UDMH + N₂O₄)

    • Usage: Used in the Apollo Lunar Module and various space probes due to its storability and ignitability without an igniter.

Modern Research and Specialized Propellants

  1. Ion Propulsion (Xenon)

    • Formula: Xe → Xe⁺ + e⁻ (Xenon ionization and expulsion)

    • Usage: Used in NASA's Dawn spacecraft and other long-duration space missions for its high efficiency.

  2. Green Propellants (Hydrogen Peroxide)

    • Formula: Decomposition of H₂O₂ → H₂O + 0.5 O₂

    • Usage: Explored for reducing chemical toxicity and environmental impact in propulsion systems.

These formulations highlight a variety of applications and innovations from hobbyist endeavors to cutting-edge space exploration technologies.