Steady-State Engine Testing of γ-Alumina Catalysts Under Plasma Assist for NOx Control in Heavy-Duty Diesel Exhaust 2003-01-1186
A slipstream of exhaust from a Caterpillar 3126B engine was diverted into a plasma-catalytic NOx control system in the space velocity range of 7,000 to 100,000 hr-1. The stream was first fed through a non-thermal plasma that was formed in a coaxial cylinder dielectric barrier discharge reactor. Plasma treated gas was then passed over a catalyst bed held at constant temperature in the range of 573 to 773 K. Catalysts examined consisted of γ-alumina, indium-doped γ-alumina, and silver-doped γ-alumina. Road and rated load conditions resulted in engine out NOx levels of 250 - 600 ppm. The effects of hydrocarbon level, catalyst temperature, and space velocity are discussed where propene and in one case ultra-low sulfur diesel fuel (late cycle injection) were the reducing agents used for NOx reduction. Results showed NOx reduction in the range of 25 - 97% depending on engine operating conditions and management of the catalyst and slipstream conditions.
Citation: Aardahl, C., Rappé, K., Park, P., Ragle, C. et al., "Steady-State Engine Testing of γ-Alumina Catalysts Under Plasma Assist for NOx Control in Heavy-Duty Diesel Exhaust," SAE Technical Paper 2003-01-1186, 2003, https://doi.org/10.4271/2003-01-1186. Download Citation
C. L. Aardahl, K. G. Rappé, P. W. Park, C. S. Ragle, C. L. Boyer, S. A. Faulkner
Pacific Northwest National Laboratory, Caterpillar Inc.
SAE 2003 World Congress & Exhibition
Lean Engine Nox Control-SP-1759, SAE 2003 Transactions Journal of Fuels and Lubricants-V112-4