Fabrication of FeO x -ZrO 2 nanostructures for automotive three-way catalysts by supercritical hydrothermal synthesis with supercritical CO 2 drying

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Abstract

In this study, an inexpensive and abundant FeO x -based catalyst was developed as a three-way catalyst (TWC). The deactivation associated with the fusion and aggregation of metallic iron under high-temperature reducing conditions was solved by the formation of FeO x -ZrO 2 nanostructures. Furthermore, high dispersibility of FeO x in the nanostructures and multiple pores were successfully formed using a supercritical CO 2 drying. As a result, the oxygen storage capacity of the FeO x increased dramatically and high stability was obtained. In a TWC reactivity evaluation, the FeZr-TWC showed a high performance similar to that of the commercially available CeO 2 -based TWC. Even after aging treatment for 20 h at 1000 °C under a 10 vol% steam condition, an NO x (T 80 , NOx ) conversion of greater than 80% was successfully achieved, whereas it was not achieved by the standard TWC. Therefore, the FeZr nanostructures are expected to have sufficient capacity to replace the conventional CeO 2 -based TWCs.

Original languageEnglish
Pages (from-to)302-309
Number of pages8
JournalJournal of Supercritical Fluids
Volume147
DOIs
Publication statusPublished - 2019 May

Keywords

  • CO drying
  • FeO
  • Hydrothermal
  • Supercritical
  • TWC
  • ZrO

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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