Development of a thermally stable Pt catalyst by redispersion between CeO2 and Al2O3

Li Lan; Xin Huang; Weiqi Zhou; Hongmei Li; Junhuai Xiang; Shanhu Chen; Yaoqiang Chen

doi:10.1039/d1ra00059d

Development of a thermally stable Pt catalyst by redispersion between CeO₂ and Al₂O₃

RSC Adv. 2021 Feb 10;11(12):7015-7024. doi: 10.1039/d1ra00059d. eCollection 2021 Feb 4.

Authors

Li Lan^{1

2}, Xin Huang³, Weiqi Zhou³, Hongmei Li², Junhuai Xiang¹, Shanhu Chen⁴, Yaoqiang Chen⁵

Affiliations

¹ College of Materials and Mechatronics, Jiangxi Science and Technology Normal University Nanchang 330013 P.R. China.
² College of Food and Bioengineering, Chengdu University Chengdu 610064 P.R. China.
³ College of Mechanical Engineering, Chengdu University Chengdu 610064 P.R. China.
⁴ College of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University Nanchang 330013 P.R. China cshscu@163.com.
⁵ College of Chemistry, Sichuan University Chengdu 610064 P.R. China.

Abstract

For catalytic systems consisting of Pt as the active component and CeO₂-Al₂O₃ as the support material, the metal-support interaction between the Pt and CeO₂ components is widely applied to inhibit aggregation of Pt species and thus enhance the thermal stability of the catalyst. In this work, a highly thermostable Pt catalyst was prepared by modifying the synthesis procedure for conventional Pt/CeO₂/Al₂O₃ (Pt/Ce/Al) catalyst, that is, the CeO₂ component was introduced after deposition of Pt on Al₂O₃. The obtained CeO₂/Pt/Al₂O₃ (Ce/Pt/Al) catalyst exhibits significantly different aging behavior. During the hydrothermal aging process, redispersion of Pt species from the surface of Al₂O₃ to the surface of CeO₂ occurs, resulting in a stronger metal-support interaction between Pt and CeO₂. Thus, the formed Pt-O-Ce bond could act as an anchor to retard aggregation of Pt species and help Pt species stay at a more oxidative state. Consequently, excellent reduction capability and superior three-way catalytic performance are acquired by Ce/Pt/Al-a after hydrothermal aging treatment.