Fabrication of FeOx-ZrO2 nanostructures for automotive three-way catalysts by supercritical hydrothermal synthesis with supercritical CO2 drying

摘要

In this study, an inexpensive and abundant FeOx-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 FeOx-ZrO2 nanostructures. Furthermore, high dispersibility of FeO2 in the nanostructures and multiple pores were successfully formed using a supercritical CO2 drying. As a result, the oxygen storage capacity of the FeOx increased dramatically and high stability was obtained.