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Old July 15th, 2013, 10:45 AM
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Originally Posted by albiondavid View Post
To make the answer quick, it adds and extra atom of oxygen to the harmful pollutants that a engine puts out to make it more safe. A engine puts out CO, NO, HC, and other stuff. Then the cat makes it into CO2, NO2, HCO, etc. Platinum makes a great catalyst. It oxidizes and reducts. But it can produce hydrogen sulfide or ammonia. Thats why when some cars run the exhaust kind of smells like eggs. Other cats are made of Palladium(oxidizer) and Rhodium(reductor), just easier to use one element to do two things than use multiple elements to do the same job. Both types has it's pros and cons.
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