1. Effective Improvement of Pt Catalyst for Exhaust Gas Purification by Using the Highly Crystallized CeO2 as an Additive.
- Author
-
Tanaka, H., Morita, I., Nagao, Y., Endo, Y., Wakabayashi, T., and Haneda, M.
- Subjects
GAS purification ,WASTE gases ,TEMPERATURE-programmed reduction ,CATALYTIC activity ,THERMAL stability - Abstract
Over the last few decades, Pd-based three-way catalysts (TWCs) have been more extensively used than Pt-based TWCs because of their higher thermal stability. In this study, the addition of CeO
2 to a Pt-based TWC was performed to improve the reductivity and dispersion of Pt particles after aging at 1000 °C. The aged dispersion of the Pt-loaded CeO2 was much higher than that of a commonly used La2 O3 –CeO2 –ZrO2 catalyst. Furthermore, the hydrogen temperature-programmed reduction conducted on Pt/CeO2 revealed that the Pt-loaded highly crystalline CeO2 (HC–CeO2 ) exhibited a higher reductivity as compared with that of the high surface area CeO2 (HS–CeO2 ). Adding a small amount of HC–CeO2 to the Pt-based TWC increased both the Pt dispersion and reductivity after aging. Owing to the high dispersion and reductivity of Pt, Rh/Pt-based TWCs with HC–CeO2 used as an additive to the Pt catalyst layer demonstrated a higher catalytic activity than that of the Rh/Pd-based TWCs even after aging at 1000 °C in an exhaust gas. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF