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Over in Europe, Mercedes-Benz has just introduced a version of the diesel powertrain for its buses that passes the EEV emissions standards without having to use either a particulate filter (DPF) or selective catalytic reduction (SCR).

Back in late 2006, two of the world's largest auto suppliers, Bosch and Denso, teamed up to create a joint venture to develop and produce diesel particulate filters. The joint venture was to build a plant in Poland near a Bosch brake parts plant. The partners were to have spent €8 million each on the factory.

Particulate filters are one of the keys to making modern diesel engines able to meet emissions requirements. They absorb the particles that comprise the black smoke people have traditionally associated with diesels. Japan's Mitsui Mining and Smelting Co has developed a new catalyst material for particulate filters that doesn't include platinum. Silver can work as a catalyst but it can't survive the high temperatures present in exhaust gases. Mitsui has blended a metal oxide in with silver to all

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