Tenneco and Cormetech sign agreement to design marine engine ultra-large diameter selective catalytic reduction (SCR) catalysts. The MARPOL Annex VI and EPA Tier IV regulations require an 80% reduction in NOx emissions, thus driving the need for engines to include aftertreatment strategies such as SCR. Tenneco’s SCR solution, incorporating the Cormetech catalyst, will be designed to help the marine industry comply with the new emission regulations. “Tenneco is an established leader in designing and developing diesel aftertreatment solutions, supplying commercial vehicle and engine manufacturers globally,” said Tim Jackson, Tenneco chief technology officer. “For more than 20 years, Cormetech has provided reliable state-of-the-art SCR catalyst for the reduction of NOx emissions.