A copper-impregnated BEA zeolite for adsorption and oxidation of aromatic species during vehicle cold starts
- Authors
- Jang, E.; Choi, L.; Kim, J.; Jeong, Y.; Baik, H.; Kang, C.Y.; Kim, C.H.; Lee, K.-Y.; Choi, J.
- Issue Date
- 15-6월-2021
- Publisher
- Elsevier B.V.
- Keywords
- After-treatment; Cold-start test; Copper species; Hydrocarbon oxidation; Hydrocarbon trap
- Citation
- Applied Catalysis B: Environmental, v.287
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 287
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128780
- DOI
- 10.1016/j.apcatb.2021.119951
- ISSN
- 0926-3373
- 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. © 2021 Elsevier B.V.
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