Due to current and future exhaust emissions regulations, oxidation catalysts are increasingly being added to the exhaust streams of large-bore, 2-stroke, natural gas engines. Such catalysts have been found to have a limited operational lifetime, primarily due to chemical (i.e. catalyst poisoning) and mechanical fouling resulting from the carry-over of lubrication oil from the cylinders. It is critical for users and catalyst developers to understand the nature and rate of catalyst deactivation under these circumstances. This study examines the degradation of an exhaust oxidation catalyst on a large-bore, 2-stroke, lean-burn, natural gas field engine over the course of 2 years. Specifically this work examines the process by which the catalyst was aged and tested and presents a timeline of catalyst degradation under commercially relevant circumstances. The catalyst was aged in the field for 2 month intervals in the exhaust slipstream of a GMVH-12 engine and intermittently brought back to the Colorado State Engines and Energy Conversion Laboratory for both engine testing and catalyst surface analysis. Engine testing consisted of measuring catalyst reduction efficiency as a function of temperature as well as the determination of the light-off temperature for several exhaust components. The catalyst surface was analyzed via SEM/EDS and XPS techniques to examine the location and rate of poison deposition. After 2 years on-line the catalyst light-off temperature had increased ∼55°F (31°C) and ∼34 wt% poisons (S, P, Zn) were built up on the catalyst surface, both of which represent significant catalyst deactivation.
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ASME 2017 Internal Combustion Engine Division Fall Technical Conference
October 15–18, 2017
Seattle, Washington, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5832-5
PROCEEDINGS PAPER
Poison Build-up and Performance Degradation of an Oxidation Catalyst in 2-Stroke Natural Gas Engine Exhaust
Marc E. Baumgardner,
Marc E. Baumgardner
Gonzaga University, Spokane, WA
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Daniel B. Olsen
Daniel B. Olsen
Colorado State University, Fort Collins, CO
Search for other works by this author on:
Marc E. Baumgardner
Gonzaga University, Spokane, WA
Daniel B. Olsen
Colorado State University, Fort Collins, CO
Paper No:
ICEF2017-3550, V002T04A002; 13 pages
Published Online:
November 30, 2017
Citation
Baumgardner, ME, & Olsen, DB. "Poison Build-up and Performance Degradation of an Oxidation Catalyst in 2-Stroke Natural Gas Engine Exhaust." Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development. Seattle, Washington, USA. October 15–18, 2017. V002T04A002. ASME. https://doi.org/10.1115/ICEF2017-3550
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