Steady-State Engine Testing of gamma-Alumina Catalysts Under Plasma Assist for NOx Control in Heavy-Duty Diesel Exhaust
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 g-alumina, In/g-alumina, and Ag/g-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.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 985607
- Report Number(s):
- PNNL-SA-37494; VT0402000; TRN: US201016%%2065
- Resource Relation:
- Conference: Lean Engine NOx Control: SAE World Congress, SAE SP 1759:121-128, Paper No. 2003-01-1186
- Country of Publication:
- United States
- Language:
- English
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