What are catalytic converters? How do they reduce emissions?
Conventional fuels (gasoline or diesel) consist of hydrocarbons. This means that hydrogen and carbon atoms arranged in different proportions form the molecules of gasoline or diesel fuel. In fact, after processing natural resources, the final product we get is hydrocarbon chains. Depending on the number of carbon atoms and the length of the chain, it is classified as gasoline or diesel.
During the combustion phase inside the engine cylinder, the fuel-air mixture almost never burns completely. Complete combustion is called when the final products of combustion are carbon dioxide and water. But when an internal combustion engine is running, for various reasons and factors, complete combustion practically does not occur. This means that there are many unwanted and toxic gases present in the exhaust system of the engine. These gases are not only harmful to environmental pollution, but also pose a serious health hazard if inhaled. Because these gases are toxic and poisonous in nature, they are allowed in small amounts according to emission standards. Emissions standards are getting stricter almost every year as more and more people become environmentally conscious. The goal is to completely get rid of internal combustion engines and switch completely to electric vehicles. But it is obvious that this goal is too far from the realities in which we currently live. In addition, it is impossible to switch to electric vehicles in a few years.
The purpose of catalytic converters
This is where catalytic converters come on the scene. Catalytic converters react with harmful exhaust gases, resulting in the formation of harmless gases normally present in the atmosphere. This includes the conversion of carbon monoxide to carbon dioxide and nitrogen oxides to nitrogen gas and oxygen. Unburned fuel (hydrocarbons) is also reduced to carbon dioxide and water and removed from the engine into the atmosphere. Ultimately, all gases are the same gases that are present in the atmosphere. This is the only purpose of catalytic converters in cars. Depending on the complexity, there are various forms of catalytic converters.
Two types of chemical reactions occur inside the exhaust system of an internal combustion engine. These are reduction and oxidation. There are metals that act as catalysts for a chemical reaction to occur instantly. These are platinum and rhodium. When exhaust gases pass over the surface of the catalytic converter, nitrogen oxides are reduced to separate nitrogen and oxygen atoms. This is a simple chemical reaction that you must have studied during your school years. The end products, oxygen and nitrogen, are harmless and are released into the environment. Avec le
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