Ultra-stable low-coordinated PtSA/CeZrO2 ordered macroporous structure integrated industrial-scale monolithic catalysts for high-temperature oxidation
Baojian Zhang, Rui Liu, Liangwei Li, Weihong Guo, Biluan Zhang, Bosheng Chen, Weidong Yuan, Pan Li, Shaowen Zhang, Jinlong Wang, Ji Yang, Zhu Luo, Yanbing Guo
Abstract
Abstract Platinum-group metals (Pt) commonly used in thermal catalytic processes often suffer from catalyst deactivation, such as Pt sintering, Pt overoxidation, and Pt loss under high-temperature conditions. To address these, we present a novel Pt SA /CeZrO 2 catalyst, featuring isolated Pt single atoms (Pt SA ) on a Ce 0.8 Zr 0.2 O 2 support with an ordered macroporous (OM) structure. Firstly, Zr-stabilized dynamic low-coordinated Pt SA releases more free d -electrons by reducing Pt-O bond occupation, thereby preserving peroxide activity at high temperatures and enhancing propane C – H activation. Additionally, the OM structure prevents Pt loss and reduces Pt loading to 0.4 g Pt /L, compared with 0.9 g Pt /L in commercial diesel oxidation catalysts. As a result, the Pt SA /CeZrO 2 maintains 92% conversion at 450 °C even after 50 h aging at 800 °C with 10 vol.% H 2 O. Finally, the catalyst is integrated into a 3.4-liter commercial cordierite monolith for developing and scaling robust catalytic converters.