Ameer Randolph
The majority of motor vehicles are powered by internal combustion engines that use fossil fuels such as gasoline, diesel, and autogas. However, there are several alternative fuels available for cars, including ethanol, biodiesel, biogasoline, propane, compressed natural gas (CNG), and hydrogen. Electric vehicles (EVs) are also becoming increasingly popular, with the second generation of EVs offering over 200 miles of range and quick charging. Other alternative fuels include biofuels, such as E85 (a blend of 51-83% ethanol and gasoline), and flex fuels, which can be used in vehicles specifically designed for them. Compressed natural gas is another option, although it may require converting the gas engine. Diesel fuel, while less commonly used than gasoline, offers better fuel economy and is often used in heavy-duty vehicles like buses and trucks.
Fuels Other Than Gas Used by Cars
| Characteristics | Values |
|---|---|
| Ethanol | A biofuel made from sugar cane, barley, corn, sugar beet, rapeseed, palm oil, and other natural resources. It is generally used as an additive to cut down on hazardous emissions. |
| Biodiesel | A substitute for diesel fuel, made from vegetable oils, animal fats, recycled cooking grease, sugar beet, rapeseed, or palm oil. It decreases emissions and is more sustainable. |
| Compressed Natural Gas | A clear, odourless, and non-corrosive gas that can be used in liquid or gas form to run a combustion engine. It is similar in power, acceleration, and cruising speed to gasoline or diesel vehicles, but it can limit driving range. |
| Diesel | A petroleum-based fossil fuel that is harder to ignite and slower to burn than gasoline. Diesel engines are more expensive, but they last longer and are more efficient than gasoline engines. |
| Electric | Electric vehicles (EVs) are increasing in popularity and offer excellent commuter options with long ranges and fast charging times. They are quieter, cheaper to maintain, and produce fewer emissions than gasoline or diesel vehicles. |
| Hydrogen | Hydrogen fuel cells or hydrogen combustion can power vehicles and is another alternative fuel option. |
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What You'll Learn
- Ethanol: A biofuel made from sugar cane, barley, corn, and other natural resources
- Compressed natural gas: A renewable, biodegradable liquid fuel made from vegetable oils, animal fats, or recycled grease
- Hydrogen: A fuel that can be used in fuel cells or hydrogen combustion engines
- Electric: Battery-stored electricity powers electric vehicles, which are quieter and cheaper to maintain
- Diesel: A petroleum-based fuel that is harder to ignite and slower to burn than gasoline
Ethanol: A biofuel made from sugar cane, barley, corn, and other natural resources
Ethanol is a popular biofuel made from sugar cane, barley, corn, and other natural resources. It is a renewable energy source since it can be generated from organic materials found in plants. It is considered the first generation of biofuels. Starch, sugar, and vegetable oil are used to make this fuel. It is made commercially from decomposing corn and wheat. Ethanol-producing plants are referred to as bio-refineries as they transform grain biomass into ethanol using live enzymes and microorganisms.
Ethanol is available in a wide number of concentrations. The higher the ethanol concentration in the fuel, the lower the carbon emissions. It is generally used as an additive in other fuel sources to help cut down on hazardous emissions. According to the U.S. Department of Energy (DOE), more than 98% of U.S. gasoline contains ethanol, typically E10 (10% ethanol, 90% gasoline). However, gasoline with higher percentages of ethanol, such as E85 (containing 51% to 83% ethanol), also exists. E85 can only be used on Flex Fuel Vehicles, which are specially designed to run on gasoline, E85, or any mixture of the two.
Ethanol is produced by drying grains and then putting them into a fermenter to be turned into sugar by yeast. The three methods for manufacturing ethanol from grain are dry milling, wet milling, and solvent refining. In the United States, nearly all fuel ethanol is produced from corn kernel starch, which is considered a conventional biofuel under the U.S. Renewable Fuel Standard Program (RFS). However, ethanol has other potential sources aside from fermenting grain starch and sugars. Researchers have experimented with several feedstocks, including grasses like switchgrass, which can produce two harvests a year for many years without annual replanting.
The Indian ethanol market is expected to rise from $2.50 billion in 2018 to $7.38 billion by 2024, with a CAGR of 14.50% from 2019 to 2024. The Indian government is attempting to minimize its reliance on imported crude oil by encouraging sugar producers in India to make ethanol for Oil Marketing Companies (OMCs). Brazil, the world's second-largest consumer of fuel ethanol after the United States, uses sugarcane to produce ethanol, which qualifies as an advanced biofuel in the United States.
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Compressed natural gas: A renewable, biodegradable liquid fuel made from vegetable oils, animal fats, or recycled grease
Compressed natural gas is a renewable and biodegradable alternative to gasoline. It is a clear, odourless, and non-corrosive gas that can be used in liquid or gas form to power combustion engines. Notably, gasoline engines would require conversion to utilize compressed natural gas. This type of fuel offers similar power, acceleration, and cruising speed to gasoline or diesel vehicles.
Compressed natural gas is produced from vegetable oils, animal fats, or recycled cooking grease. The process of recycling vegetable oil involves collecting and transporting it in approved containers to specialized companies for processing. North America, for instance, recycles a significant amount of inedible meat products and used cooking oil annually. This recycled grease, also known as yellow grease, is then transformed into valuable ingredients for renewable fuel.
Using compressed natural gas as a vehicle fuel offers several advantages. Firstly, it helps reduce emissions. Biodiesel emissions from compressed natural gas are significantly lower than those from petroleum diesel. This contributes to a cleaner environment and improved air quality. Secondly, compressed natural gas provides an alternative to non-renewable diesel fuel, which, despite having lower carbon dioxide and nitrous oxide emissions, still contributes to environmental pollution.
However, there are also some considerations to keep in mind when using compressed natural gas. One limitation is the driving range, as a smaller volume of gas can be stored in a standard-sized tank. Additionally, while low percentages of biodiesel can be used without engine modification, higher levels of compressed natural gas may require modifications to the vehicle's engine and fuel delivery system.
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Hydrogen: A fuel that can be used in fuel cells or hydrogen combustion engines
Hydrogen is an energy carrier that can be used as a fuel for cars. Hydrogen fuel-cell vehicles (HFCVs) use an electric motor, powered by a fuel-cell stack, to turn the wheels. In the fuel-cell stack, pure hydrogen (H2) combines with oxygen (O2) from the air to produce electricity and water vapour. This electricity is then used to turn the wheels.
The Toyota Mirai, the best-selling hydrogen car in the US, has a fuel cell rated at 90 kW (120 horsepower). However, this is not sufficient to accelerate onto a fast-moving highway, so Toyota adds in a high-voltage, low-capacity battery, similar to those used in gasoline-electric hybrid vehicles.
The main challenge for automotive engineers is that hydrogen fuel cells are most efficient at a steady power output. However, the power demands in the average car vary significantly, from 15 kilowatts (20 horsepower) to maintain a steady speed on a flat road, to 10-20 times that amount for maximum acceleration.
Hydrogen fuel cell cars are quiet, energy-efficient, and produce no emissions. They have a range and performance equivalent to gasoline cars and can be refuelled as quickly as standard cars. However, hydrogen fuel currently sells for considerably more than gasoline.
As of mid-2022, there were 17,000 or fewer hydrogen-powered vehicles on US roads, all in California, the only state with a network of retail hydrogen fuelling stations.
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Electric: Battery-stored electricity powers electric vehicles, which are quieter and cheaper to maintain
Electric vehicles (EVs) are powered by battery-stored electricity and are an increasingly popular alternative to traditional gasoline-powered cars. EVs have several advantages over their gasoline counterparts, including reduced maintenance costs and quieter operation.
One of the most significant benefits of EVs is their environmental impact, or lack thereof. Unlike gasoline-powered cars, EVs produce zero tailpipe emissions, resulting in improved air quality and reduced carbon pollution. This advantage is particularly pronounced in geographic areas that use low-polluting energy sources for electricity production, such as wind and solar power. While generating electricity to charge EVs may contribute to carbon pollution, the overall environmental footprint of EVs is significantly lower than that of traditional cars.
EVs are also more energy-efficient than gasoline-powered vehicles. They utilize regenerative braking, allowing them to recapture energy that would otherwise be lost during braking. This technology, combined with advancements in battery technology, enables EVs to convert a higher percentage of their energy into movement compared to gasoline engines, resulting in reduced fuel costs for EV owners.
The batteries in EVs have improved significantly over the years, offering longer ranges and extended lifespans. Several manufacturers now provide extended battery warranties, with some batteries expected to last up to 15 years in moderate climates. Additionally, advancements in battery technology have led to more reliable and environmentally friendly batteries, addressing previous concerns about their reliability and impact on the environment.
Another advantage of EVs is their potential to improve grid reliability through vehicle-to-grid (V2G) charging. This technology allows EVs to act as power sources, pushing energy back to the grid when demand is high and charging when demand is low. This capability can help stabilize the power grid and reduce the need for costly infrastructure upgrades as the number of EVs on the road increases.
In summary, EVs powered by battery-stored electricity offer a quieter and more cost-effective alternative to traditional gasoline-powered cars. They are more energy-efficient, produce fewer emissions, and benefit from advancements in battery technology, making them an increasingly attractive option for environmentally conscious consumers.
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Diesel: A petroleum-based fuel that is harder to ignite and slower to burn than gasoline
Diesel is a petroleum-based fuel that is harder to ignite and slower to burn than gasoline. It is a fossil-based energy source, derived from crude oil, and used by the majority of motor vehicles worldwide. Diesel engines tend to be more expensive than gas engines due to the need for sturdier parts to withstand higher temperatures and pressures. Diesel vehicles also tend to be noisier, especially at higher frequencies, which is off-putting to consumers.
Despite this, diesel has several advantages over gasoline. For one, diesel engines last longer than gasoline engines. This makes diesel a popular choice for long-haul trucks that need to go many hundreds of thousands of miles between engine overhauls. Diesel vehicles also offer better fuel economy, with less maintenance, and modern diesel engines can emit less carbon dioxide than gas engines. Diesel fuel vehicles operate at 30% higher efficiency than gas-powered vehicles.
Diesel is also used for off-road purposes, such as in agriculture, construction, and transportation. Off-road diesel powers vehicles and equipment that do not operate on roads or highways, including tractors, harvesters, plows, backhoes, bulldozers, cranes, and forklifts. It is also used for marine vessels, some aircraft, and carnival rides.
Bio-diesel is a substitute for regular diesel fuel, often made from sugar beet, rapeseed, or palm oil. It is a renewable biofuel that burns cleaner and emits less carbon dioxide than diesel. However, some scientists fear that growing crops for biofuels will lead to deforestation and compete with natural resources needed for growing food.
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Frequently asked questions
Diesel is a common alternative to gas, also known as gasoline, and is made from petroleum. Diesel engines tend to be more expensive than gas engines as they require sturdier parts.
Some other fuels that can be used in cars include ethanol, biodiesel, biogasoline, propane, compressed natural gas (CNG), and hydrogen.
Diesel vehicles offer better fuel economy and require less maintenance. They also last longer than gasoline engines as they operate at a higher efficiency and produce less carbon dioxide.
Yes, ethanol is a popular biofuel that can be used as an alternative fuel source for cars. However, it is typically used as an additive to reduce emissions. Higher concentrations of ethanol can be corrosive to carburetors in smaller engines.
Zero-emission cars use electricity and hydrogen as fuel. Electric vehicles are becoming increasingly popular and offer lower pollution and maintenance costs compared to gasoline and diesel vehicles.
