The catylist is overheating from too much unburned fuel going through your exhaust or (possibly) restricted causing too much backpressure. You should have a code a bad 02 sensor can ause this since it won't trim the fuel and it will run rich also a bad fuel pressure regulator, so rail pressure goes sky high.
Your converter is clogged and needs replacing.
Either the converter is partially clogged and needs replacing or you have a miss in the engine which is dumping raw fuel into the converter where it is being burned.
If the catalytic converter is removed the computer will turn on the check engine light, and fuel economy may suffer.
Partially clogged or engine misfire.
The converter is plugged and needs to be replaced
check the catalytic converter. if the engine isisnt running hotter than normal it is most likely plugged exhaust somewhere likely in the catalytic converter
Partially clogged! Y-THINK-Y
Yes.
Yes, an engine misfire will cause this and will ruin the converter. It may also be partially clogged.
If 1996 or later it will turn the check engine light on.
Carbon dioxide and nitrogen.
Look that is plausable but the real answer is that the engine is dumping raw fuel into the converter (catalytic converter) and burning it inside the converter and this can be dangerous in some cases you can actually have a mini explosion\fire causing a good bit of damage. I hope this is helpful to anyone needing the answer..