Hydrogen internal combustion engine vehicle information
Vehicle with hydrogen internal combustion engine
Filler neck for hydrogen of a BMW, Museum Autovision, Altlußheim, GermanyA liquid hydrogen tank by Linde, Museum Autovision, Altlußheim, GermanyA BMW Hydrogen 7 concept carRX-8 hydrogen rotaryBMW H2RMusashi 9 Liquid hydrogen truck
A hydrogen internal combustion engine vehicle (HICEV) is a type of hydrogen vehicle using an internal combustion engine.[1] Hydrogen internal combustion engine vehicles are different from hydrogen fuel cell vehicles (which utilize hydrogen electrochemically rather than through combustion). Instead, the hydrogen internal combustion engine is simply a modified version of the traditional gasoline-powered internal combustion engine.[2][3] The absence of carbon means that no CO2 is produced, which eliminates the main greenhouse gas emission of a conventional petroleum engine.
As pure hydrogen does not contain carbon, there are no carbon-based pollutants, such as carbon monoxide (CO) or hydrocarbons (HC), nor is there any carbon dioxide (CO2) in the exhaust. As hydrogen combustion occurs in an atmosphere containing nitrogen and oxygen, however, it can produce oxides of nitrogen known as NOx. In this way, the combustion process is much like other high temperature combustion fuels, such as kerosene, gasoline, diesel or natural gas. Therefore, hydrogen combustion engines are not considered zero emission.
A downside is that hydrogen is difficult to handle. Due to the very small size of the hydrogen molecule, hydrogen is able to leak through many apparently solid materials in a process called hydrogen embrittlement. Escaped hydrogen gas mixed with air is potentially explosive.
^"INL-Hydrogen internal combustion engine vehicles". Archived from the original on 2004-10-15. Retrieved 2008-12-17.
^"Hydrogen Use in Internal Combustion Engines" (PDF). US Department of Energy. December 2001. Retrieved 25 July 2017. This article incorporates text from this source, which is in the public domain.
^Hydrogen-Fueled Internal Combustion Engines; see section 5
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