A copper-impregnated BEA zeolite for adsorption and oxidation of aromatic species during vehicle cold starts

Eunhee Jang, Layoung Choi, Jinseong Kim, Yanghwan Jeong, Hionsuck Baik, Chun Yong Kang, Chang Hwan Kim, Kwan Young Lee, Jungkyu Choi

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number119951
JournalApplied Catalysis B: Environmental
Volume287
DOIs
Publication statusPublished - 2021 Jun 15

Keywords

  • After-treatment
  • Cold-start test
  • Copper species
  • Hydrocarbon oxidation
  • Hydrocarbon trap

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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