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I had a low RPM rattle on a thick metal shield on my passenger cat (not the flexible diamond pattern stuff all over the underside of the body) and it drove me NUTS.
So I jacked up the back of the car on jack stands, rolled under the car with a hammer in my hand, and started tapping bits and pieces to see if I could duplicate the sound.
When I found it, I whacked the crap out of it a couple of times (felt real good btw) and took the car for a drive. Problem solved!
Your rattle may not be inside your catalytic converter itself. Check it out and bring a hammer with you just in case you can fix it while you're looking to isolate it.
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