Biofuels: Its Types, Generation, and Advantages

What is Biofuel?

Biofuel, any fuel that is derived from biomass that is, plant or algae material or animal waste. Since such feedstock material can be replenished readily, biofuel is considered to be a source of renewable energy, unlike fossil fuels such as petroleum, coal, and natural gas.

Biofuels are non-fossil fuels. It is a type of alternative cleaner fuel and energy. Biofuels are renewable and sustainable. It is produced from biomass.

Biofuel is commonly advocated as a cost-effective and environmentally benign alternative to petroleum and other fossil fuels, particularly within the context of rising petroleum prices and increased concern over the contributions made by fossil fuels to global warming.

Biofuels can mainly be classified into primary biofuels and secondary biofuels. Primary biofuels include fuelwood used for cooking and heating purposes and organic materials. Secondary biofuels include liquid biofuels such as biodiesel, ethanol and which are used in industries and automobiles.


The energy derived from these biofuels is commonly referred to as bioenergy. It is a renewable source of energy that can be replenished. Modern-day technology uses landfill and waste dumping areas as bioenergy resources.

There are 3 ways to convert raw materials into required energy forms: chemical processes that use chemical agents for break downs, thermal processes that use heat for conversion, and biochemical processes that convert heat into essential energy forms Use bacteria.

Biofuels can be solid, liquid, or gaseous in nature.

  • Solid biofuel: wood, dried plant material, and compost
  • Liquid biofuel: bioethanol and biodiesel, biobutanol
  • Gaseous biofuel: biogas, bio-hydrogen

Generations of biofuels

There are three types of biofuels: 1st, 2nd and 3rd generation biofuels. They are characterized by their sources of biomass, their limitations as a renewable source of energy, and their technological progress.

First generation biofuels: First-generation biofuels are produced from sugar, vegetable oil, starch, or animal fat using standard technology. Common first-generation biofuels include biodiesel, bio ether, vegetable oil, bio alcohol, biogas.

Second generation biofuels: These originate from non-food crops, such as cellulosic biofuels, and waste biomass such as wheat and corn stalks and wood, etc. Examples include advanced biofuels such as biofuels, bio methanol.

Third Generation Biofuels: These are produced from microbes like algae. Algae consist of 40% of lipids that can be converted into biodiesel or synthetic petroleum. Algae has the potential to produce the most energy among all sources.

Types of Biofuels

The two most common types of biofuels in use today are ethanol and biodiesel, both of which represent the first generation of biofuel technology. The Bioenergy Technologies Office (BETO) is collaborating with industry to develop next-generation biofuels made from non-food (cellulosic and algae-based) resources.


Biodiesel is a form of diesel fuel derived from plants or animals and consisting of long-chain fatty acid esters. It is typically made by chemically reacting lipids such as animal fat (tallow), soybean oil, or some other vegetable oil with an alcohol, producing a methyl, ethyl or propyl ester.

Biodiesel is a renewable resource or fuel made from vegetable oil, recycled cooking oil, soybeans, palm oil, peanut oil, canola oil, animal fats, and fatty acids. This method of regeneration is known as transesterification. Biodiesel has versatile properties and can be used as a diesel in vehicles. It can be used as a replacement for petroleum and is biodegradable. The toxins produced are comparatively less than petroleum. It is also safe to handle.

Biodiesel is a liquid fuel produced from renewable sources, such as fresh and old vegetable oils and animal fats, and a cleaner-burning replacement for petroleum-based diesel fuel. Biodiesel is non-toxic and biodegradable and is created by mixing alcohol with vegetable oil, animal fat, or recycled cooking oil.

Like petroleum-derived diesel, biodiesel is utilized to fuel compression-ignition diesel engines. Biodiesel can be mixed with petroleum diesel in any percentage, including B100 (pure biodiesel) and the most common mixture, B20 (a mixture containing 20% ​​biodiesel and 80% petroleum diesel).


  • It is also renewable! Sufficient plant, algae, or bacterial crops can provide abundant biodiesel fuel.
  • It is recycled! A lot of biodiesel on the market is derived from used cooking vegetable oils.
  • Domestic production reduces dependence on foreign fossil fuels and promotes rural agricultural economies.
  • Tailpipe reduces emissions, burns cleaner, and does not contain sulfur, eliminating sulfur dioxide emissions, compared to petroleum-based diesel.


  • Biodiesel is currently more costly to create commercially than petroleum diesel because the production foundation is not yet large scale
  • Biodiesel is sensitive to a cold climate and can gel when the temperature falls, causing fuel injection difficulties (although this can be set with expensive engine modifications).
  • While many diesel vehicle engines can run on biodiesel with minimal or no modification, biodiesel does not work in standard gasoline engines.
  • Biodiesel production increases food costs, both are used to generate biodiesel in food crops, as well as feedstocks for biodiesel to produce algae and bacteria.

Bio ethanol

Bioethanol is an alcohol made by microbial fermentation, mostly from carbohydrates produced in sugar- or starch-bearing plants such as corn, sugarcane, sweet sorghum or lignocellulosic biomass. The fermentation process involves less intake of energy and the production system is much simpler than that for biodiesel.

Ethanol is a renewable fuel that can be produced from various plant materials, collectively known as “biomass“. Ethanol is an alcohol that is used as a mixture of gasoline to increase octane and cut carbon monoxide and other smog-producing emissions.

The most common mixture of ethanol is E10 (10% ethanol, 90% gasoline). Some vehicles, called flexible-fuel vehicles, are designed to run on E85 (a gasoline-ethanol mixture containing 51% –83% ethanol, depending on geography and weather), much compared to regular gasoline Is an alternative fuel with greater ethanol content. Approximately 97% of gasoline in the United States includes some ethanol.

Most ethanol plants are made from starch and sugars, but scientists have continued to develop technologies that will allow the use of cellulose and hemicellulose, a non-edible fibrous material that constitutes the bulk of the plant substance. In case, many profitable-scale cellulosic ethanol biorefineries are currently operational in the United States.

The common method of converting biomass into ethanol is called fermentation. Throughout fermentation, microorganisms (e.g., bacteria and yeast) metabolize plant sugars and produce ethanol.


  • It is renewable! Ethanol can be regenerated by giving sufficient crop yields.
  • Domestic production reduces dependence on foreign fossil fuels and promotes rural agricultural economies.
  • Ethanol burns cleaner than gasoline, releasing about 15 percent less greenhouse gas emissions
  • Improvements in cellulosic ethanol can make ethanol fuel from scrap cellulose such as scrap wood, food by-products, and non-food plants such as switchgrass


  • Ethanol received from corn, beets, and sugarcane plays directly with the food supply, raising the cost of other foods and grain-fed meats.
  • Cultivated ethanol crops destroy the soil and use toxic industrial agricultural chemicals that can contaminate the water supply.
  • Ethanol has less energy than gasoline, reducing fuel mileage by between 15 and 30 percent
  • It currently requires more energy to make large amounts of ethanol; However, cellulosic ethanol may be the “magic bullet” to solve it and the food competition dilemma.
  • High blends or pure ethanol may be corrosive on which it is not designed to run, and cannot be carried through existing oil pipelines due to corrosion restrictions.
  • Transforming a standard gasoline engine to operate on large mixtures or purified ethanol can be costly from several hundred to thousands of dollars.


Biobutanol is a four-carbon alcohol produced by the fermentation of biomass. It has a long hydrocarbon chain which renders it non-polar. The production of biobutanol can be carried out in ethanol production facilities. The primary use of biobutanol is as a fuel in internal combustion engines.

The biobutanol is the secondary-known fuel between the three biofuels, but it has the largest potential. Biobutanol is iso-butanol made from algae or bacteria instead of animals or vegetable fats such as biodiesel. Standard petrol engines can use Biobutanol without prior engine modification. Biobutanol is mostly obtained from fermenting sugar from the organic feedstock.

The most commonly used method of producing biobutanol ferments simple sugars found in biomass feedstock. A by-product of this fermentation process is butanol, in addition to acetone and ethanol. Biobutanol can reduce carbon emissions by a significant 85% compared to gasoline, making it a more viable alternative to gas and fuels that are a mixture of gasoline and ethanol.

At very high concentrations, biobutanol is mixed with conventional gasoline instead of ethanol for use in non-petrol engine models. Research has proved that biobutanol at 100 percent is usable in unmodified engines.


  • It is also renewable! Biobutanol is formed from algae or bacteria.
  • It can be used directly in a gasoline engine without modification.
  • It can utilize the existing pipeline and supply chain foundation for delivery.
  • It has a high-octane level, so if there is any loss in fuel mileage, it is very low.
  • Non-corrosive for engines and pipelines
  • Domestic production decreases dependency on imported fossil fuels


  • Feedstocks are required for production, although non-edible feedstocks and genetically modified bacteria and algae strains may resolve the issue.
  • Production costs are relatively high, but the industry is still in its infancy, and costs will decrease as it increases.


Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide. It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste.

Biogas is a renewable source of energy produced by anaerobic digestion of biomass. In simple words, biogas is obtained when organic matter breaks down in the absence of oxygen. The raw elements used are compost, food waste, local waste, farming waste, and sewerage.

The main ratio of biogas is methane and carbon dioxide. It also has little symmetries of hydrogen sulfide, hydrogen, carbon monoxide, and siloxanes. Biogas is commonly used for heating, electricity, and automobiles.


Biohydrogen is H2 that is produced biologically. Interest is high in this technology because H2 is a clean fuel and can be readily produced from certain kinds of biomass. Many challenges characterize this technology, including those intrinsic to H2, such as storage and transportation of a non-condensable gas.

Bio-hydrogen is a renewable source similar to biogas. It is biologically a process of producing hydrogen with the help of bacteria, algae, and archaea. It may be the right choice for fossil fuels. Some common methods of developing biohydrogen are photo fermentation, dark fermentation, direct photolysis, and indirect photolysis.

Advantages of Biofuel

Biofuels help reduce the carbon footprint of transportation and other industries, by making the most of our planet’s carbon cycle. Every gallon of biofuel that replaces a gallon of fossil fuel helps reduce greenhouse-gas emissions. Following are the some advantages of biofuel:

  1. Reduces Greenhouse Gases: One of the most striking benefits of using biofuels is that it does not emit toxins. When burned most of the above types are similar to the carbon dioxide required by green plants. It does not expel harmful gases and does not pollute the air. This in turn reduces the effects of global warming and depletion of the ozone layer.
  2. High engine performance: Biodiesel can be used as an alternative to diesel in automobiles. The quality of the engine lasts for a long time using them as an alternative. This is increasing the performance of the vehicle.
  3. More energy efficient: Compared to petroleum and diesel, these biofuels have proven to be more energy-efficient.
  4. Renewable energy: Biofuels are a renewable source of energy compared to fossil fuels. The main reason for this is that the raw materials used are agricultural waste, plant waste, commercial waste, and household waste. All these are available in abundance and thus they are easily renewable.
  5. Burner Cleaner: When these biofuels are burned, it does not produce any odor biologically. A very little or minimal amount of carbon dioxide is emitted which hardly makes any difference compared to fossil fuels.
  6. Healthy for humans: By using biofuels, the effect of chemical fertilizers is reduced to a great extent. Reduced greenhouse gas emissions make the respiratory environment cleaner. Thus, the effects of global warming and the depletion of the ozone layer are reduced which will ultimately improve the general health of humans.
  7. Positive impact: As petrol and petroleum prices are increasing, more technology is being developed to use biodiesel and biogas in automobiles. They are considered a good alternative to petroleum and gasoline and are economical. This saves drivers time and money. It positively impacts society in general.

To Conclude

Biofuels are like the savior of the economy in general. They have a lot of positive aspects compared to fossil fuels. Significant research needs to be done to optimize the use of all types of biofuels as a whole. The main attraction for the use of biofuels is that raw materials are available cheaply and are economical.

Transportation of these raw materials and the final product is cheap. Since biofuels are mainly from crops, it can be manufactured in every country. In this way, each country will become self-sufficient in manufacturing biofuels. This will reduce the monopoly of fuel. Thus, it is promoting the renewable resource environment in a great way.


Examples of biofuels include ethanol (often made from corn in the United States and sugarcane in Brazil), biodiesel (sourced from vegetable oils and liquid animal fats), green diesel (derived from algae and other plant sources), and biogas (methane derived from animal manure and other digested organic material).

As biofuel is known as an alternative to diesel fuel, there are other uses. Many assume that the material is used just for transportation. But biofuel can provide hydrogen, clean up oil, work as cooking oil and more.

Biofuels are a renewable energy source, made from organic matter or wastes, that can play a valuable role in reducing carbon dioxide emissions. Biofuels are one of the largest sources of renewable energy in use today. In the transport sector, they are blended with existing fuels such as gasoline and diesel.

When biodiesel is burned the CO2 is released back into atmosphere. Less noxious, non-toxic – Biodiesel lacks the unpleasant odor of petroleum diesel and exhaust emissions smell like a barbecue!

Biogas is only one of many types of biofuels, which include solid, liquid or gaseous fuels from biomass. Methane, the principal component in biogas, has four times the volumetric energy density of hydrogen (H2) and is suitable for use in many types of fuel cell generators.

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