Effects of Multicomponent Hydrocarbon Feed on Hydrocarbon Adsorption–Desorption and Oxidation Light-Off Behavior on a Pd/BEA Hydrocarbon Trap
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A model hydrocarbon trap material consisting of palladium promoted zeolite beta on a monolith core was studied with a multicomponent hydrocarbon feed. Dodecane and ethylene adsorption, followed by temperature programmed oxidation (TPO), was used in the presence of CO in wet and dry conditions to study the impact of various species on hydrocarbon storage, oxidation, and desorption. Low temperature adsorption experiments were used to quantify hydrocarbon storage capacity, while temperature programmed desorption (TPD) and TPO studies were used to investigate both oxidation and desorption of the various hydrocarbon species. The low temperature adsorption experiments suggest a moderate impact of water on dodecane uptake as dry experiments adsorbed more dodecane overall than those under wet conditions. Additionally, the presence of CO and ethylene also impaired dodecane uptake. TPD studies indicated a coupled relationship between hydrocarbon oxidation light-off and desorption. By varying the composition of the feed, specifically via the inclusion of CO or ethylene, dodecane oxidation light-off was delayed, which actually increased the overall hydrocarbon trap efficiency.
KeywordsHydrocarbon trap Site inhibition Cold-start emissions
The authors would like to thank the Department of Energy, Vehicle Technologies Office (DE- EE0008233) for financial support.
- 1.Zammit M et al (2012) Future automotive aftertreatment solutions : the 150°C challenge workshop report. US DRIVE Work shop. https://cleers.org/low-temperature-protocols/
- 2.United States Environmental Protection Agency (2014) Tier 3 motor vehicle emissions and fuel standards, vol 79. US EPA, Washington, DCGoogle Scholar
- 3.Majewski WA, Khair MK (2006) Diesel emissions and their control. SAE International, WarrendaleGoogle Scholar
- 5.Todor O, Montreuil CN, Gandhi HS, McCabe RW, Otto K (2005) Adsorption of hydrocarbons and other exhaust components on silicalite. Ind Eng Chem Res 30:2333–2340Google Scholar
- 6.Heimrich MJ, Smith LR, Kitowski J (2010) Cold-start hydrocarbon collection for advanced exhaust emission control. SAE technical papers series, vol 1. SAE International, WarrendaleGoogle Scholar
- 23.Gies H, van Koningsveld H (1999) Faulted zeolite framework structures. In: 12th international zeolite conference, p 2999Google Scholar
- 24.Breck DW (1984) Zeolite molecular sieves. Rovert E. Krieger Publishing Company Inc., MalabarGoogle Scholar