文献类型：期刊文献

英文题名：Revealing Pretreatment-Induced Structure Evolution of Lafeo3 Supported AU Catalyst for Co Oxidation Reaction

作者：Dai, Sheng[1]; Jiang, Yongjun[1]; Zou, Lian[2]; Zhang, Haiyan[2]; Tang, Xuan[1]; Zhou, Lihui[1]; Tian, Chengcheng[2,3]

机构：[1] Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] School of Resources and Environment Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240110845)

语种：英文

外文关键词：Catalyst supports - Chemical industry - Density functional theory - Gold nanoparticles - High resolution transmission electron microscopy - Iron compounds - Lanthanum compounds - Perovskite - Phase interfaces

摘要：Heterogeneous catalysts play a pivotal role in the chemical industry. Pretreatments in reducing or oxidizing atmospheres have been widely utilized to alter the structure of heterogeneous catalysts, with the aim of enhancing their catalytic performance. However, the pretreatment atmosphere can, at times, trigger unexpected structural changes in catalysts and even lead to catalytic degradation. Hence, the selection of an appropriate pretreatment atmosphere for heterogeneous catalysts is critical and requires a clear understanding of their corresponding dynamic evolution to improve their performance in a targeted manner, particularly relying on in situ observation. In this study, a promising CO oxidation catalyst, LaFeO3 supported Au nanoparticles (Au/LFO) is selected, and the influence of the pretreatments in different atmospheres on Au/LFO is explored by using in situ transmission electron microscopy (TEM) and density functional theory (DFT) calculation. Our findings reveal that the commonly used reducing pretreatment for noble-metal catalysts triggered strong metal-support interactions in Au/LFO, suppressing its CO adsorption performance. In contrast, the oxidizing pretreatment preserves the metallic Au and the metal/support interface as efficient active sites to promote CO oxidation activity and stability simultaneously. This work discloses the structure evolution at the interface between noble metals and perovskite oxide supports in response to different gas phase treatments and clarifies their structure-property relationships. ? 2024, The Authors. All rights reserved.