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Originally Posted by hawk2100n
A catalyst is a catalytic converter.
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Strictly speaking, a catalytic converter is a device, which could have any number of different catalysts in it.
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However you are correct in that lean burn performs worse from an emissions standpoint.
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That all depends on what importance you assign to different emissions. It's higher in NOx (which really matters only in densely-populated areas), but considerably lower in HC, CO, and - most importantly - CO2.