Interfacial activation of catalytically inert Au (6.7 nm)-Fe3O4 dumbbell nanoparticles for CO oxidation
Gold nanocatalysts, support effect, CO oxidation, Au–Fe3O4, dumbbell nanoparticles
Au nanoparticles epitaxially grown on Fe3O4 in Au (6.7 nm)–Fe3O4 dumbbell nanoparticles exhibit excellent stability against sintering, but display negligible catalytic activity in CO oxidation. Starting from various supported Au (6.7 nm)–Fe3O4 catalysts prepared by the colloidal deposition method, we have unambiguously identifi ed the signifi cance of the Au–TiO2 interface in CO oxidation, without any possible size effect of Au. In situ thermal decomposition of TiO2 precursors on Au–Fe3O4 was found to be an effective way to increase the Au–TiO2 interface and thereby optimize the catalytic performance of TiO2-supported Au–Fe3O4 dumbbell nanoparticles. By reducing the size of Fe3O4 from 15.2 to 4.9 nm, the Au–TiO2 contact was further increased so that the resulting TiO2-supported Au (6.7 nm)–Fe3O4 (4.9 nm) dumbbell particles become highly effi cient catalysts for CO oxidation at room temperature.
Tsinghua University Press
Binghui Wu,Hai Zhang,Cheng Chen,Shuichao Lin,Nanfeng Zheng, Interfacial activation of catalytically inert Au (6.7 nm)-Fe3O4 dumbbell nanoparticles for CO oxidation. NanoRes.2009, 2: 975-983