Katerina Swanson
Fossil fuels are essential to modern life, providing the energy to heat homes, power vehicles, and drive industry. However, the world is becoming increasingly concerned about the environmental impact of fossil fuels, and the planet's finite supply. In this context, the use of fossil fuels in cars is a pressing issue. Fossil fuels used in cars include oil, natural gas, propane, gasoline, kerosene, and diesel. The environmental impact of these fuels varies, with diesel cars, for example, producing less CO2 but more oxides of nitrogen. As a result, alternative fuels such as ethanol, methanol, and ammonia are being explored, alongside the development of electric vehicles.
| Characteristics | Values |
|---|---|
| Most common fossil fuel used in cars | Oil |
| Other fossil fuels used in cars | Coal, natural gas, propane |
| Fossil fuel products used in cars | Gasoline, kerosene, diesel |
| Fossil fuel use in the US | 81% of total energy |
| Fossil fuel extraction | Oil extracted from oil wells |
| Fossil fuel refinement | Oil refined into gasoline, kerosene, diesel |
| Fossil fuel ignition | Requires surrounding ignition temperature |
| Fossil fuel combustion | Produces energy and harmful gases |
| Fossil fuel alternatives | Ammonia, ethanol, methanol, biodiesel, electricity |
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What You'll Learn
Gasoline
The use of gasoline in cars has had a significant impact on the environment. Gasoline-powered cars are a major source of greenhouse gas emissions, particularly carbon dioxide, which contributes to global warming and climate change. To mitigate these effects, some countries have implemented regulations to control air pollution, requiring the use of oxygenated, reformulated, and low-volatility gasoline. Additionally, the Renewable Fuel Standard aims to reduce emissions and oil imports by adding fuel ethanol to gasoline.
In recent years, there has been a growing trend towards alternative fuels and electric vehicles. Compressed natural gas (CNG), for example, can be used as a substitute for gasoline in combustion engines, resulting in lower CO2 emissions. Gasoline cars can also be retrofitted to become bifuel vehicles, allowing the use of both CNG and gasoline. However, the transition away from gasoline and other fossil fuels is expected to have significant economic impacts due to the heavy integration of the fossil fuel industry into the global economy.
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Diesel
The diesel engine was invented by Rudolf Diesel, who originally designed it to use coal dust as fuel. However, he also experimented with vegetable oil, and this idea contributed to the production and use of biodiesel today. Biodiesel is a superior lubricant and can restore the lubricity of diesel fuel in blends of just 1-2% biodiesel. It can also improve the smell of diesel fuel.
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Natural gas
CNG is stored at high pressure (21,000 to 25,000 kPa or 3,000 to 3,600 psi) and LNG at cryogenic temperatures (−162 to −129 °C or −260 to −200 °F). These storage requirements result in larger cylinders that take up more space than gasoline or diesel tanks. However, NGVs offer several advantages over conventional diesel and gasoline vehicles. They have a lower carbon footprint, with 25 to 28 percent less emissions than their gasoline or diesel-powered equivalents, and they are safer, with sealed fuel systems that prevent spills and provide better crash protection. Additionally, natural gas burns cleaner, leading to reduced maintenance costs as NGVs can go longer between oil changes and engine tune-ups.
NGVs are a good choice for high-mileage, centrally fueled fleets due to their similar fuel range support and reduced greenhouse gas emissions compared to conventional fuels. LNG offers a greater energy density than CNG, making it more suitable for long-distance travel. The use of natural gas as a transportation fuel also provides energy independence, as it reduces reliance on imported oil. In the U.S., about 86 percent of the natural gas used comes from domestic sources, and reserves are estimated to meet demand for over 100 years.
While natural gas offers these benefits, there are some limitations to its use in vehicles. The larger cylinders required for CNG and LNG storage can reduce cargo space, and the distribution infrastructure and number of refueling stations for NGVs are lower compared to liquid fuels. Additionally, some vehicle models may not be compatible with natural gas operation, requiring conversions or aftermarket conversion systems to utilize CNG or LNG. Despite these challenges, major carmakers are increasingly manufacturing vehicles capable of running on CNG, and bi-fuel offerings that can use both natural gas and gasoline are available from companies like Ford, General Motors, and Ram Trucks.
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Ethanol
Recent research has also explored the use of direct ethanol fuel cells, which allow ethanol to be directly poured in and used for fuel that can be converted into electricity at high efficiency. This technology could be used to power vehicles and create nearly noise-less electric power generators, offering cleaner emissions than fossil fuels and no charging times compared to electric vehicle batteries.
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Ammonia
Cars typically run on fossil fuels such as gasoline, kerosene, diesel, and aviation fuel, which are all oil-based. However, there is a growing interest in alternative fuels, and ammonia (NH3) has been proposed as a viable substitute for fossil fuels in internal combustion engines.
Another benefit of ammonia as a fuel is its potential to reduce carbon emissions. When ammonia is produced using coal, the CO2 emitted can be sequestered, as the combustion products are nitrogen and water. This makes ammonia a more environmentally friendly option compared to traditional fossil fuels. Furthermore, the production and transportation of ammonia are not an issue, as it is already produced and transported in large quantities for other industrial applications.
While ammonia has been the subject of several experimental projects and proposals, there are some concerns about its toxicity (NH3) and safety. However, these challenges can be addressed through established practices in NH3 handling, storage, and use. Overall, ammonia shows promise as a sustainable and environmentally friendly alternative to fossil fuels for cars, with the potential to contribute to net-zero emissions and decarbonization efforts.
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Frequently asked questions
Cars use fossil fuels such as oil, coal, and natural gas. Oil is the most commonly used fossil fuel and is used to create gasoline, kerosene, and diesel.
Fossil fuels contain a chain of hydrocarbons that, when burned, create energy. This energy is then converted into mechanical energy, which is used to drive the vehicle.
Alternatives to fossil fuels for cars include ethanol, methanol, biodiesel, and ammonia. Electric cars are also becoming more popular, although they still rely on electricity generated by fossil fuels in many places.
The burning of fossil fuels in cars releases carbon dioxide (CO2) and other harmful gases into the atmosphere, contributing to climate change and rising global temperatures. Diesel cars, in particular, produce high levels of oxides of nitrogen (NOx).
