Oxidation of Diesel Particulates by Catalyzed Wall-Flow Monolith Filters. 2. Regeneration Characteristics of Platinum, Lithium, and Platinum-Lithium Catalyzed Filters 872137
Regeneration characteristics of Pt, Li, and Pt-Li catalyzed wall-flow monolith (WFM) filters were examined in a reactor mounted in the exhaust from a GM 4.3 L diesel engine. Regeneration rates were measured over a range of exhaust temperatures corresponding to various engine speeds and torques. A fresh 0.2 wt% Pt - 0.2 wt% Li filter regenerated much more rapidly than filters containing 0.2 wt% Pt, 0.4 wt% Pt, or 0.2 wt% Li. The data suggest that both Pt and Li operate as soot oxidation catalysts, with the Li following a redox mechanism proposed by McKee and Chatterji (Carbon 13, 381, 1975). Significant oxidation activity was observed with the fresh Pt-Li filter at temperatures as low as 350°C, thus demonstrating activity at temperatures nearly within the normal operating range of light-duty GM diesel vehicles. The Pt-Li filter deactivated with time on stream due to reaction of lithium with SO2 in the exhaust.
Citation: McCabe, R. and Sinkevitch, R., "Oxidation of Diesel Particulates by Catalyzed Wall-Flow Monolith Filters. 2. Regeneration Characteristics of Platinum, Lithium, and Platinum-Lithium Catalyzed Filters," SAE Technical Paper 872137, 1987, https://doi.org/10.4271/872137. Download Citation
R. W. McCabe, R. M. Sinkevitch
General Motors Research Laboratories, Physical Chemistry Dept., Warren, Mi
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition
SAE 1987 transactions: Fuels and Lubricants-V96-7