How a Catalyst Cleans Car Exhaust
The three-way catalyst in cars
0:59 · 720p · With AI narration and captions. This sample was made with the same system as this service.
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Cleaning Car Exhaust
Let's see how a catalyst cleans up car exhaust.
Catalyst and Honeycomb
Inside the three-way catalyst, partway along the exhaust pipe, is a ceramic honeycomb lined with narrow channels.
Precious Metals on the Walls
Its walls are coated with tiny particles of precious metals such as platinum, palladium, and rhodium.
All Three Change at Once
On the metal surface, carbon monoxide, hydrocarbons, and nitrogen oxides react, changing at the same time into carbon dioxide, water, and nitrogen.
Lowering Activation Energy
A catalyst lowers the activation energy, making the reactions happen more easily. The catalyst itself is not used up.
When It Works Best
The catalyst works best when it is hot, and when the mixture of fuel and air is just right. An oxygen sensor helps keep that mixture at the right ratio.
Three Gases Cleaned at Once
A three-way catalyst turns three harmful substances into less harmful ones, all at once.
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