Researchers in the US have shown that perovskites - a class of mixed oxide minerals - can perform as well as platinum in certain types of catalytic converter for removing pollutants from diesel exhaust. The finding could eventually result in cheaper, more robust catalytic converters for diesel engines that do not rely on expensive and scarce platinum group metals. Vehicle exhaust is a major polluter One of the main pollutants that needs to be removed from vehicle exhaust is a mixture of NO and NO2, referred to as NOx, which can be rendered harmless by reducing the gases to nitrogen. But...