Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation

作     者：Wen Shi Tongtong Gao Liyun Zhang Yanshuang Ma Zhongwen Liu Bingsen Zhang 石文;高彤彤;张历云;马彦爽;刘忠文;张炳森

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Key Laboratory of Applied Surface and Colloid ChemistryMinistry of EducationSchool of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026AnhuiChina 

基　　金：supported by the National Natural Science Foundation of China(21773269,21761132025,91545119,21703262) the Youth Innovation Promotion Association CAS(2015152) the Joint Foundation of Liaoning Province Natural Science Foundation Shenyang National Laboratory for Materials Science(20180510047) 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2019年第40卷第12期

页      码：1884-1894页

摘      要：Iron oxide supported Au nanomaterials are one of the most studied catalysts for low-temperature CO *** performance not only critically depends on the size of the supported Au nanoparticles(NPs)but also strongly on the chemical nature of the iron *** this study,Au NPs supported on iron oxide nanorods with different surface properties throughβ-FeOOH annealing,at varying temperatures,were synthesized,and applied in the CO *** characterizations of the interactions between Au NPs and iron oxides were obtained by X-ray diffraction,transmission electron microscopy(TEM),and X-ray photoelectron *** results indicate that the surface hydroxyl group on the Au/FeOOH catalyst,before calcination(Au/FeOOH-fresh),could facilitate the oxygen adsorption and dissociation on positively charged Au,thereby contributing to the low-temperature CO oxidation *** calcination at 200℃,under air exposure,the chemical state of the supported Au NP on varied iron oxides partly changed from metal cation to Au0,along with the disappearance of the surface OH ***/FeOOH with the highest Au0 content exhibits the highest activity in CO oxidation,among the as-synthesized ***,good durability in CO oxidation was achieved over the Au/FeOOH catalyst for 12 h without observable *** addition,the advanced identical-location TEM method was applied to the gas phase reaction to probe the structure evolution of the Au/iron oxide series of the catalysts and support structure.A Au NP size-dependent Ostwald ripening process mediated by the transport of Au(CO)x mobile species under certain reaction conditions is proposed,which offers a new insight into the validity of the structure-performance relationship.

主 题 词：Iron oxide nanorods Surface property Au nanoparticle CO oxidation Structure evolution 

学科分类：081704[081704] 07[理学] 070304[070304] 08[工学] 0817[工学-轻工类] 0703[理学-化学类] 

核心收录：

D　O　I：10.1016/S1872-2067(19)63374-7

馆 藏 号：203799253...