During pyrolysis, a material is heated to high temperatures in the absence of oxygen.
This process leads to the decomposition of the material into smaller molecules and chemical compounds.
The primary gases released during this process are syngas, which includes hydrogen, carbon monoxide, and methane.
Additionally, carbon dioxide and light hydrocarbons are also produced.
What Gases Are Released During Pyrolysis? (4 Key Gases Explained)
1. Syngas
Syngas is a mixture of gases primarily composed of hydrogen, carbon monoxide, and methane.
Syngas is a valuable product as it can be used as a fuel or converted into other chemicals.
2. Carbon Dioxide and Light Hydrocarbons
Alongside syngas, carbon dioxide and light hydrocarbons are also produced during pyrolysis.
These gases are typically formed at higher temperatures and contribute to the overall gas yield.
3. Syngas Formation
Syngas is formed as the organic material in the feedstock breaks down under high heat.
The hydrogen and carbon monoxide are derived from the thermal decomposition of the organic compounds.
Methane is formed through secondary reactions involving these gases.
The exact composition of syngas can vary depending on the type of feedstock and the specific conditions of the pyrolysis process, such as temperature and heating rate.
4. Carbon Dioxide and Light Hydrocarbons Production
These gases are typically produced at higher temperatures during the pyrolysis process.
Carbon dioxide is often a byproduct of the oxidation reactions that occur, even in the absence of oxygen, due to the presence of other oxidizing agents or the decomposition of certain compounds within the feedstock.
Light hydrocarbons, such as ethylene and propylene, can be formed through the cracking of larger hydrocarbon molecules.
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