Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 19, Issue 2-4, Pages 357-365Publisher
SPRINGER
DOI: 10.1007/s10450-012-9458-3
Keywords
Cold-start; Vehicle emissions; Zeolites; Hydrocarbon trap; Stability
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Funding
- Spanish Ministerios de Ciencia e Innovacion - CSIC [201080I031]
- Medio Ambiente y Medio Rural y Marino [331/PC08/3-13.1]
- Generalitat Valenciana and FEDER [PROMETEO/2009/047]
- Ministry of Education of Spain [AP2009-3544]
- Ramon y Cajal contract [RYC-2009-04483]
- University of Alicante
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Simulated cold-start tests have been carried out to evaluate the performance of H-ZSM-5 and H-BETA zeolites as hydrocarbon traps under simulated gasoline car exhaust gases, paying special attention to the effect of water on their behaviour. It is concluded that the hydrothermal treatment of the zeolites in the acidic form contributes to the better performance of these materials as hydrocarbon traps since the stabilization of the zeolites takes place. Moreover, the decrease of the surface acidity of the zeolites results in an increase of the Si/Al ratio, which contributes to the decrease of the water affinity for adsorption sites. Thus, the competition with hydrocarbon molecules in the exhaust for the adsorption sites is reduced which increases their trap efficiency. The stabilized H-ZSM-5 is the zeolite that showed the best performance with a propene offset temperature of 240 A degrees C, which should be high enough for the three-way catalyst to carry out its role as catalytic converter.
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