Abstract
In this study, we prepared an effective cold-start hydrocarbon (HC) trap by impregnating BEA zeolites with copper. The resulting Cu-impregnated BEA zeolites allowed for effective HC trapping and, more desirably, low-temperature HC oxidation. An optimal Cu content (∼5 wt%) resulted in the highest cold-start test (CST) performance with respect to two representatives HCs, propene and toluene. The preferential adsorption of propene under wet conditions was key to achieving high efficiency (∼79 %). We found that the presence of Cu+ ions allowed the preferential adsorption of HCs, especially propene, and the CuO particles on the exterior surface (∼1−2 nm in size) could oxidize HCs at low temperatures (starting from ∼210 °C). Finally, a severe hydrothermal treatment at 800 °C was used to simulate long-term driving; the CST performance revealed that the adsorption ability for propene was dramatically decreased, whereas those of toluene, along with the oxidation ability, were still preserved.
Original language | English |
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Article number | 119951 |
Journal | Applied Catalysis B: Environmental |
Volume | 287 |
DOIs | |
Publication status | Published - 2021 Jun 15 |
Bibliographical note
Funding Information:This research was supported by the Super Ultra Low Energy and Emission Vehicle Engineering Research Center (SULEEV ERC) ( 2016R1A5A1009592 ) through the National Research Foundation of Korea (NRF) funded by the Korea Government (Ministry of Science and ICT; MSIT) . Some SEM and TEM characterizations were conducted at the Seoul Center in the Korea Basic Science Institute (KBSI).
Funding Information:
This research was supported by the Super Ultra Low Energy and Emission Vehicle Engineering Research Center (SULEEV ERC) (2016R1A5A1009592) through the National Research Foundation of Korea (NRF) funded by the Korea Government (Ministry of Science and ICT; MSIT). Some SEM and TEM characterizations were conducted at the Seoul Center in the Korea Basic Science Institute (KBSI).
Publisher Copyright:
© 2021 Elsevier B.V.
Keywords
- After-treatment
- Cold-start test
- Copper species
- Hydrocarbon oxidation
- Hydrocarbon trap
ASJC Scopus subject areas
- Catalysis
- General Environmental Science
- Process Chemistry and Technology