Buy and Sell Scrap catalytic converters
Precious metals such as Platinum, Palladium, and Rhodium can be found in scrap catalytic converters which makes recycling catalytic converters very profitable for both individuals and recycling centers.
You can create a business out of buying scrap catalytic converters in your local area and then reselling to large recycling centers for a nice profit. Scrap catalytic converters are fairly easy to find, it can be as simple as driving around your local area and looking for junk cars parked in your neighbor’s backyard.