Enhanced hydrothermal durability of Co3O4@CuO–CeO2 Core-Shell catalyst for carbon monoxide and propylene oxidation

Haney Park, Eun Jun Lee, Hyoseong Woo, Dalyoung Yoon, Chang Hwan Kim, Chang Ho Jung, Ki Bong Lee, Kwan Young Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The Co3O4@CuO–CeO2 catalyst with modified core–shell structure was designed to enhance hydrothermal durability and low-temperature for carbon monoxide (CO) and propylene (C3H6) co-oxidation. The Co3O4–CuO–CeO2 (CCC) catalysts are excellent for the simultaneous low-temperature oxidation of CO and hydrocarbons (HC). However, Co3O4 catalysts are susceptible to water poisoning on the surface and sintering during hydrothermal treatment. Therefore, we first attempted to introduce a core–shell structure in the CCC catalysts to enhance hydrothermal durability. Cubic-shaped Co3O4 with excellent stability was synthesized as the core, and a shell composed of CuO and CeO2 was formed through a coating process. The optimal shell thickness was determined considering both gas accessibility and hydrothermal durability. To further enhance the oxidation activity of the Co3O4@CeO2 catalyst, varying amounts of Cu were introduced via incipient wetness impregnation. When an appropriate amount of Cu was impregnated with the Co3O4@CeO2 catalyst, electron transfer was accelerated owing to the redox equilibrium of Cu2+ + Ce3+ ↔ Cu+ + Ce4+; thus, the oxidation activity of the catalyst was improved. The Co3O4@CuO–CeO2 catalyst had excellent CO and C3H6 co-oxidation activities and hydrothermal durability. Thus, the developed catalyst was more advanced than the existing CCC catalysts.

Original languageEnglish
Article number154916
JournalApplied Surface Science
Volume606
DOIs
Publication statusPublished - 2022 Dec 30

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2016R1A5A1009592).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • CO and CH co-oxidation
  • CoO–CuO–CeO catalysts
  • Core@shell structure
  • Hydrothermal durability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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