caa a22 4500 46325290X CHVBK 20180405153345.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10562-007-9039-3 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9039-3 Gold supported on well-ordered ceria films: nucleation, growth and morphology in CO oxidation reaction [Elektronische Daten] [J.-L. Lu, H.-J. Gao, S. Shaikhutdinov, H.-J. Freund] Structure of gold nanoparticles formed by physical vapor deposition onto thin ceria films was studied by scanning tunneling microscopy (STM). Gold preferentially nucleates on point defects present on the terraces of the well-ordered, fully oxidized films to a low density. The nucleation expands to the terrace step edges, providing a large variety of low-coordinated sites. Only at high coverage, the Au particles grow homogeneously on the oxygen-terminated CeO2(111) terraces. The morphology of Au particles was further examined by STM in situ and ex situ at elevated (up to 20mbar) pressures of O2, CO, and CO+O2 at 300K. The particles are found to be stable in O2 ambient up to 10mbar, meanwhile gold sintering emerges at CO pressures above ∼1mbar. Sintering of the Au particles, which mainly proceeds along the step edges of the CeO2(111) support, is observed in CO+O2 (1:1) mixture at much lower pressure (∼10−3mbar), thus indicating that the structural stability of the Au/ceria catalysts is intimately connected with its reactivity in the CO oxidation reaction. Springer Science+Business Media, LLC, 2007 gold nationallicence ceria nationallicence CO oxidation nationallicence thin films nationallicence scanning tunneling microscopy nationallicence Lu J.-L Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut Gao H.-J Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, 100080, Beijing, China aut Shaikhutdinov S. Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut Freund H.-J Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut Catalysis Letters Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 114/1-2(2007-03-01), 8-16 1011-372X 114:1-2<8 2007 114 10562 https://doi.org/10.1007/s10562-007-9039-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9039-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu J.-L Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut NATIONALLICENCE 700 1- Gao H.-J Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, 100080, Beijing, China aut NATIONALLICENCE 700 1- Shaikhutdinov S. Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut NATIONALLICENCE 700 1- Freund H.-J Department of Chemical Physics, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany aut NATIONALLICENCE 773 0- Catalysis Letters Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 114/1-2(2007-03-01), 8-16 1011-372X 114:1-2<8 2007 114 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer