Technical Paper
Deposit Mitigation in SCR Aftertreatment Systems by Deposition of LotusFlo® Superhydrophobic Coatings on Exhaust Pipe Surfaces
2021-04-06
2021-01-0571
The objective of this research was to mitigate urea-derived deposit formation within selective catalytic reduction (SCR) aftertreatment systems by application of specific superhydrophobic coatings to exhaust pipe surfaces. Coatings were applied using a plasma immersion ion processing (PIIP)-like process denoted LotusFlo™. This process utilizes high DC-impulse power waveforms in conjunction with appropriate chemical precursors to generate coatings suited to a specific application. For the present research, organosiloxane (Lotus-130) and fluorinated organosiloxane (Lotus-131) coated surfaces were evaluated. Deposit accumulation studies were executed using the Exhaust Composition Transient Operation LaboratoryTM (ECTO-LabTM) burner system. An in-situ imaging system was installed in the ECTO-Lab to observe differences in the deposit formation process between coated and uncoated exhaust pipes.
