Unveiling the elusive roles of Cu species in determining the hydrocarbon trap performance during cold start in Cu-impregnated MFI type zeolites

Jinseong Kim, Jaehee Shim, Jin Chul Kim, Eunhee Jang, Jeong Hyeon Lee, Hionsuck Baik, Chun Yong Kang, Chang Hwan Kim, Kwan Young Lee, Sang Kyu Kwak, Jungkyu Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

High-performance zeolite-based hydrocarbon (HC) traps were developed by impregnating MFI zeolites with Cu species. The corresponding cold-start test (CST) results revealed that the optimal Cu loading (ca. 5–7 wt%) led to high CST performance. To the best of our knowledge, our unprecedented complementary investigation based on both experimental and theoretical approaches revealed that Cu+ ions rather than Cu2+ ions were key for securing high HC adsorption (especially propene) in the presence of copious amounts of water vapor. Moreover, tiny CuO nanoparticles (≤ 4 nm) on the exterior zeolite surface resulted in effective HC oxidation. This preferential HC adsorption and oxidation synergistically contributed to effective hydrocarbon trapping, making the Cu-impregnated MFI zeolites active HC traps. However, after hydrothermal treatment, a lower Cu content (3 wt% instead of 5–7 wt%) was rather desirable for preserving the marked CST performance, indicating that the original physicochemical properties were more damaged at higher Cu content.

Original languageEnglish
Article number122916
JournalApplied Catalysis B: Environmental
Volume337
DOIs
Publication statusPublished - 2023 Nov 15

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Copper speciation
  • DFT calculations
  • Hydrocarbon oxidation
  • Hydrocarbon trap
  • Hydrothermal stability

ASJC Scopus subject areas

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

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