Impact of lubricant oil additives on the performance of Pd-based three-way catalysts

Daekun  Kim, University Of Tennesse

Zinc dialkyl dithiophosphate (ZDDP) is the most commonly used anti-wear additive in lubricating oil due to its high effectiveness at reducing wear to improve engine efficiency and durability. However, from previous studies it has been shown that ZDDP contributes to the deactivation of three-way catalysts (TWCs) by phosphorus poisoning accumulative and irreversible deactivation process [1-2].  Recently, oil-miscible ionic liquids (IL) have been developed as new-generation anti-wear additives, which can less-friction and greater fuel economy than ZDDP [3]. As alternative lubricant anti-wear additives are sought, it is important that these additives are also compatible with current emissions control devices. In the present investigation, an oil-miscible ionic liquid (IL) is evaluated for its impact on TWC reactivity and benchmarked against the industry standard ZDDP.

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