Interfacial Activation of Catalytically Inert Au(6.7 nm)-Fe_(3)O_(4)Dumbbell Nanoparticles for CO Oxidation  

作　　者：Binghui Wu Hai Zhang Cheng Chen Shuichao Lin Nanfeng Zheng 

机构地区：[1]State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China

出　　处：《Nano Research》2009年第12期975-983,共9页纳米研究（英文版）

基　　金：We thank the National Natural Science Foundation of China(Nos.20871100,20721001);a Distinguished Young Investigator Grant(No.20925103);Research Fund for the Doctoral Program of Higher Education of China(No.200803841010);Natural Science Foundation of Fujian for a Distinguished Young Investigator Grant(No.2009J06005);the Key Scientific Project of Fujian Province(No.2009HZ0002-1).

摘　　要：Au nanoparticles epitaxially grown on Fe_(3)O_(4)in Au(6.7 nm)-Fe_(3)O_(4)dumbbell nanoparticles exhibit excellent stability against sintering,but display negligible catalytic activity in CO oxidation.Starting from various supported Au(6.7 nm)-Fe_(3)O_(4)catalysts prepared by the colloidal deposition method,we have unambiguously identifi ed the significance of the Au-TiO_(2)interface in CO oxidation,without any possible size effect of Au.In situ thermal decomposition of TiO_(2)precursors on Au-Fe_(3)O_(4)was found to be an effective way to increase the Au-TiO_(2)interface and thereby optimize the catalytic performance of TiO_(2)-supported Au-Fe_(3)O_(4)dumbbell nanoparticles.By reducing the size of Fe_(3)O_(4)from 15.2 to 4.9 nm,the Au-TiO_(2)contact was further increased so that the resulting TiO_(2)-supported Au(6.7 nm)-Fe_(3)O_(4)(4.9 nm)dumbbell particles become highly efficient catalysts for CO oxidation at room temperature.

关 键 词：Gold nanocatalysts support effect CO oxidation Au-Fe_(3)O_(4) dumbbell nanoparticles 

分 类 号：O64[理学—物理化学]