Effective Utilization of Pt Catalyst in Three-Way Catalytic System by Employing Calcined Ceria with Alumina

作者：Itaru Morita, Hiroki Tanaka, Shohei Saeki, Akihiro Isayama, Katsuya Iwashina, Yuki Nagao, Yoshinori Endo, Takashi Wakabayashi, Masaaki Haneda · 发表于：SAE technical papers on CD-ROM/SAE technical paper series · 年份：2024 · DOI：10.4271/2024-01-2133 · 被引用次数：4 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Hydrodesulfurization Studies、Nanomaterials for catalytic reactions

<div class="section abstract"><div class="htmlview paragraph">To satisfy the stringent regulations for exhaust gas emissions from gasoline-powered vehicles, large amounts of Rh and Pd have often been employed in three-way catalysts (TWCs) as the main active components. On the other hand, Pt-based TWCs are not often used in gasoline vehicles because Pt is readily sintered by its exhaust gases at approximately 1000 °C [1, 2]. In general, Pt-based TWCs must be located away from large thermal loads to maintain the active sites for gas purification. Based on this background, we previously reported that employing a small amount of CeO2 calcined at 1000 °C (cal-CeO2) in Pt-based TWCs was one of the most effective approaches for improving the catalytic activity without increasing the amount of Rh and Pd [3]. The effect of cal-CeO2 was attributed to the higher redox performance and Pt dispersion derived from the strong interactions between Ce and Pt. Therefore, the resulting Pt-based TWCs exhibited high catalytic performance, despite the low specific surface area (SSA) of cal-CeO2 due to high temperature calcination. In this study, we demonstrated that the low SSA of cal-CeO2 can be easily improved by adding Al2O3&...