Chemist here: there is vast research being done on non-precious metal catalysis. Not only for catalytic converters but im sure its being done as well. Its just the platinum metals have the correct properties. There is bunch of stuff you can do with nickel ir copper but (in organic chemistry for making new compounds) palladium is by far the most versatile and most used.
The Pd stuff is like 20-30 yrs old, nobel prize worthy but the nonprecious metals in catalysis are not as developed so we can hope
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