Abstract
Developing robust Pt/CeO2-based three-way catalysts (TWCs) with enhanced oxygen buffering capability and low-temperature activity is highly desirable. In this study, a new TWC family, Pt/(1 − x)CeO2(core)@xZrO2(shell) (where x = 0-0.5), was prepared and evaluated at degreened (DG) and hydrothermally aged (HTA) states. Incorporation of 0.1 molar concentration of ZrO2 resulted in a decreased temperature that 50% (T50) (CO: 167 °C, THCs: 218 °C, NO: 228 °C) and 90% (T90) (CO: 207 °C, THCs: 237 °C, NO: 244 °C) conversions achieved over HTA 1.8 wt% Pt/0.9CeO2@0.1ZrO2 compared to the HTA 1.8 wt% Pt/CeO2 sphere (CO: T50,90 = 179, 222 °C, THCs: 234, 252 °C, NOx: 240, 260 °C). An enhanced oxygen storage capacity and oxygen release rate were observed over Pt/0.9CeO2@0.1ZrO2 compared to the Pt/CeO2 sphere. Increasing the ZrO2 molar concentration to values greater than 0.2 resulted in increased T50s (224, 265 274 °C) and T90s (251, 289, 292 °C) for CO, THCs, and NOx, respectively, over 1.8 wt.% Pt/0.5CeO2@0.5ZrO2. Overall, this work highlights the potential of forming a ZrO2 shell on CeO2 spheres as a support for TWC applications.
| Original language | English |
|---|---|
| Pages (from-to) | 3298-3306 |
| Number of pages | 9 |
| Journal | Catalysis Science and Technology |
| Volume | 15 |
| Issue number | 11 |
| DOIs | |
| State | Published - Apr 17 2025 |
Funding
This work was partially supported by start-up funding from the Department of Chemical and Biological Engineering, University at Buffalo (UB), The State University of New York (SUNY). A portion of this research was sponsored by the U. S. Department of Energy's Vehicle Technology Office, with particular thanks to Gurpreet Singh, Siddiq Khan, and Nicholas Hansford of the Offroad, Rail, Marine and Aviation (ORMA). Additionally, the FEI Talos F200X STEM was provided by the Department of Energy, Office of Nuclear Energy, Fuel Cycle R&D Program and the Nuclear Science User Facilities. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).