Mitsui Mining & Smelting Co. has developed a catalyst for particulate filters for diesel engines that uses silver, rather than much costlier platinum.
The new catalyst, which has a PM purification efficiency equal to platinum, can reduce precious metal costs by 90% or more, according to Mitsui Mining.
Silver has not been used as a catalyst material because of its poor heat resistance. Mitsui Mining said it has succeeded in making silver withstand heat of up to 800° C by adding metal oxide.
The catalyst is undergoing performance evaluation tests.