Ford Motor Co. is turning to an obscure set of rare earth oxides in an effort to drive down cost and conserve the amount of precious metals in the catalytic converters of its cars and trucks. By utilizing greater amounts of REO – including lanthanum, cerium, praseodymium and neodymium – to optimize the reactivity of catalyst precious metals such as palladium, platinum and rhodium, the auto maker has reduced its overall precious-metal use in North American gasoline-fueled vehicles about ...

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