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Sulfur compounds in diesel exhaust diminish the performance of aftertreatment devices and contribute to particulate matter mass and composition. Sulfur sorbate catalysts that store and release sulfur compounds have been used in conjunction with NOx aftertreatment catalysts to decrease the negative effects of sulfur.1 The temperature range of diesel exhaust is broad and may vary with application. The effect of temperature on the performance of sulfur catalysts will determine the usefulness of such catalysts for diesel applications. In this study bench reactor and engine testing of sulfur sorbate catalysts were performed to characterize the release of sulfur compounds as a function of temperature. Engine tests were performed on a lightduty platform with No. 2 Diesel fuel.

The new John Deere 2.9 Liter 3-cylinder diesel engines have been designed and developed to increase value through improved performance, reduced vibration and lower noise, and special features for first application on the new 5000 Series tractors. Engine fuel and air systems have been redesigned to give excellent fuel consumption, improved torque reserve, reduced smoke, and excellent starting. Lower engine vibration has been achieved by reducing the mass of the internal reciprocating components. A gear driven auxiliary drive has been added to power accessories such as the tractor hydraulic pump. The redesigned engine provides a superior product, well suited for Off-Highway applications.