文献类型：期刊文献

英文题名：Double-Stable Ce-Based Oxide: Capturing Atomic Precious Metals Via Ostwald Ripening for Multicomponent Three-Way Catalysts Construction

作者：Sun, Liwei[1]; Zhang, Zeshu[2]; Liu, Peng[1]; Bao, Feipeng[2]; Xu, Jianheng[2]; Wang, Dong[3]; Lou, Yang[4]; Zhang, Yibo[2]; Yang, Xiangguang[2]

机构：[1] Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China; [2] Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, China; [3] School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China; [4] School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214000, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230403174)

语种：英文

外文关键词：Atoms - Catalyst activity - Cerium oxide - Oxygen - Platinum - Sintering

摘要：Precious metal catalysts have been widely used to catalyze various reactions, particularly three-way catalysts for automobile exhaust purification. Pt, Pd, and Rh, which are dispersed on Ce-based oxides that store and release oxygen, serve as the active center of a catalyst. However, methods to construct multifunctional three-way catalysts to maximize their efficiency and stabilize them are lacking. In this study, Ce-based oxides with a double-stable mode were synthesized to capture and stabilize the precious metals Pt and Rh migrated by Ostwald ripening (OR), and a multicomponent three-way catalyst was accurately synthesized, which showed good catalytic activity and thermal stability. The origin of Ce-based oxides with a dual-stable mode was studied by TEM, XRD, oxygen storage/release rate test, and XPS. AC-STEM, EXAFS, in situ diffuse reflectance Fourier transform infrared, and H2 temperature-programmed reduction studied the OR migration of precious metals and the composition change after aging. Results showed that in the lean/rich oxygen alternating shift atmosphere containing CO, the proportion of OR migration of Pt and Rh precious metals whose initial state is a single atom can reach 100%. This discovery provides a basic understanding of the sintering mechanism of precious metals, which is of great importance for the development and industrial application of three-way catalysts. ? 2023, The Authors. All rights reserved.