Positrons

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Yes. Chemical reactions can occur in a vacuum, but it depends on the reaction and the materials involved.

A vacuum means there is very little gas or air (especially oxygen).

### Types of reactions in a vacuum

| Reaction              | Can it happen?                 | Example                          |
| --------------------- | ------------------------------ | -------------------------------- |
| Combustion            | Usually no                     | LPG + oxygen                     |
| Thermal decomposition | Yes                            | CaCO₃ → CaO + CO₂                |
| Catalytic reactions   | Yes, if reactants are supplied | Surface catalysis                |
| Hydrogen reactions    | Yes                            | H₂ + O₂ → H₂O                    |
| Solid-state reactions | Yes                            | Metal oxide synthesis            |
| Nuclear reactions     | Yes                            | Fusion under suitable conditions |

### For your SpaceTrain / future-planet energy concept

![What Is Cvd In Mechanical Engineering? A Guide To High-Performance Surface Coatings - Kintek Solution](https://images.openai.com/static-rsc-4/cPGa36GlOZdttpn5MM_ce7VjS0JMtkEQYb14qraOWx-yYBClglWB6fo_n79-gbYLjSz6u4dhbzZMG_8FjurgYggaa347aKafL7H7RBw99qDo3Fh8v9NHjkxv14hV8HK_2QN47V2bnfJQ-qdCIVyJi9Q4D51TKQXb-MtzkBDo7H3tgn0fH3OJJRvZubDvNZOB?purpose=fullsize)

![¿Cómo Facilita Un Sistema De Bomba De Alto Vacío La Síntesis De Perrhenatos De Calcio De Alta Calidad? Síntesis Experta - Kintek Furnace](https://images.openai.com/static-rsc-4/6hznT26g5MTki89fDQ6mCAQ4js5F_glytVl5W6xYrEShrHCYQL9soOzFb1YvjF7lzswJPokQ5BYmLU8yICEGR0qvD_fD2YP1OXABlMBsEWl5rfKKcC1mrubTp4Qk-zfhrrUl6PP6X1mMbyTGLRlHX2rUA7pn0kkcyMY2xG5kfEUIHpjVXewgLxzTXjbeVCFs?purpose=fullsize)

![Electric propulsion of spacecraft - Physics Today](https://images.openai.com/static-rsc-4/cu5E8XwMb3V6FWJHP2dlA8sDYIIfKyyXPVyluVHtg-hYH4vCbdttvJg-L8JLsm1hG6u6lHd_cFdTgXNt1AMKajnOWZ2cXyMzOHBiug9TXmludiQhaF5bp4KHJhuDEYGaaTE8FhHMG4VUbItsiHcalzYbslS66aUSeOBh6xEgcxXeOEMZD6hISPuz9ojCuA20?purpose=fullsize)

![Life's building blocks may have formed in interstellar clouds](https://images.openai.com/static-rsc-4/2eAg-dyQjOlrA7_KjesFRR5p8RiSfKWTbr_ywQe_XdyuOiQhrkA5NgxKXZFeaoYU6tOXCZXswielzZzwA-kEM1WfzgNQyXVJVTjWHYnBsyE57v3OB0RLmc0u0t8cWGsQ7gz68gAs8OEy40DFnHWNaGSyPQ8h8kYHDFObJ8LCbztoZ08zCcF536R_tA8AW44e?purpose=fullsize)

![Trionics Labs — Precision Engineering & Simulation Solutions](https://images.openai.com/static-rsc-4/Qs3eas-NmYAczXBJV0EljpvrRTgnUsVfRbWtyATL7bQkV9L9Pe0MUXTW2jVv4C2BMZFM7fU-JxuK8Pg6AIbSibHE3yER9T5EhrDMcg6mTEN6OGy2_fUSj6AJ4ARrukr7yWNIqNzuW7c9t69tuuSbfgRj2pCeuhNTItHr_GLQoja408XmaT6KveoJBaeLE6Ph?purpose=fullsize)

![ChemTron VR-series Reactors S.S. Vacuum Reactor VR-500(* Please Contac
 – Instrument Trading Center](https://images.openai.com/static-rsc-4/hix5Pw8SArFQdxpbY7OWVPawVMAmKnCzz4XUqRMXAvV_O3ehCWJPjcGnnOfMnSBNmIFtu5np1p0TYFBMb8wKJsFqDCOhQhBrO9qzOci4wywSczLWjlJP1CtvIG3-SlrtKbKXRmi_Nuwt-jUqv5N0CuzsT6OXHu3pRdbAVfHmRA9GPIzG3R8rSUG2mu2FQlYR?purpose=fullsize)

![Electric Spacecraft Propulsion: How Do Ion Thrusters Work? | GlobalSpec](https://images.openai.com/static-rsc-4/GRflUbnOHSrsDrGzIygyK_4W3SiY8nzBKIaZbZBaxZoO8pH4wri9IvusJ7xGuC8tSASniMgXVQMKErbRIqkNiOHiJIEyuew-zu4uVF3Seu0dUOVqHdqoH8EKZsI_d5xcdHKybUm17c6nNnz19WIlOTq_TGo94QL8Ke8p3A0mvrZ5Jm09oeVX09AxLgy6AkOY?purpose=fullsize)

![IAM - Materials Science and Engineering Laboratories & Workshop - Materials Synthesis](https://images.openai.com/static-rsc-4/Wu2a2pFKNrfDEbVK-NVz1-vyatxGMWRP5XxDQjqBFNQuKNvBYnLdtHY5QQaS5b033Nfi5YrIpMOhtmi4UneF7kXkH9KuIuvh_LcgTegbYJYaBw5C13eUg-xqyUwT0rGuw6KYu0GTk_V02Ck1JXqC0C1np4Vq7tXe36HmuRRPnsDSM-uNvS3lhHcrmivNmXHK?purpose=fullsize)

You could investigate:

* Vacuum catalytic reactors.

* Solar-powered thermal decomposition.

* Hydrogen production and storage.

* Plasma reactions.

* Solid oxide fuel cells.

Important: A catalyst does not create energy. It changes the reaction pathway and can lower activation energy.

Are you imagining chemical reactions occurring in the vacuum of outer space, without atmospheric oxygen?

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