the most important producer countries for noble metals that are very important for catalysis are south africa (79% for platinum (Pt), 34% for palladium (Pd), 87% for rhodium (rh); russia (12% for Pt, 51% for Pd, 9% for rh) and north america (5% for Pt, 12% for Pd, 2% for rh). altogether, the world mine production amounts to 220 tonnes Pt, 215 tonnes Pd and 25 tonnes rh per year. in addition ...