Biofuels
Biofuels
Biofuels (/ˈbaɪoʊˌfjuːlz/) are a type of fuel derived directly from living matter. These fuels are considered renewable energy sources.
Etymology
The term "biofuel" is derived from the Greek word "bios" meaning "life" and the English word "fuel".
Types of Biofuels
Biofuels can be divided into two main categories: First-generation biofuels and Second-generation biofuels.
- First-generation biofuels are made from sugar, starch, or vegetable oil. They are not generally considered sustainable as they are often made from food crops, which can lead to food shortages and price increases. Examples include bioethanol and biodiesel.
- Second-generation biofuels are produced from sustainable feedstock. The sustainability of these biofuels depends on the balance between growth rate, land use, and CO2 emissions. Examples include cellulosic ethanol.
Production
Biofuels are produced through a variety of processes, including anaerobic digestion, fermentation, and transesterification.
Use
Biofuels are most commonly used in vehicles, but can also be used in engines and fuel cells. They are considered a potential alternative to traditional fossil fuels, as they produce fewer greenhouse gases during their production and use.
Related Terms
- Biomass
- Biogas
- Bioenergy
- Bioethanol
- Biodiesel
- Cellulosic ethanol
- Renewable energy
- Fermentation
- Anaerobic digestion
- Transesterification
External links
- Medical encyclopedia article on Biofuels
- Wikipedia's article - Biofuels
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