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Mitsui Mining & Smelting Co. Develops Lower-Cost Catalyst for DPFs

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.



As nickel, silver, and other less costly materials replace platinum and palladium in catalysts, the demand for these rare and precious metals will decrease and reduce costs of equipment. It will also give truck and car owners piece of mind that their emission control equipment will no longer be such tempting targets to thieves.


Great! This will enable cheaper retrofitting old heavy industry and transportation vehicles!

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