Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 41, Pages 27758-27768Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp03394b
Keywords
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Funding
- National Natural Science Foundation of China [21273150, 21203119]
- National Basic Research Program of China [2013CB933201]
- national high technology research and development program of China [2011AA03A406, 2012AA062703]
- Shanghai Natural Science Foundation [12ZR1430800]
- Shanghai Innovation Program [12YZ161]
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Density functional theory (DFT+U) was used to study the adsorption of Au-x (x = 1-4) clusters on the defective CeO2(111) facet and CO adsorption on the corresponding Au-x/CeO2-x catalyst, in this work Aux clusters are adsorbed onto the CeO2-x + superoxide/peroxide surface. When Au-1 is supported on the CeO2(111) facet with an O vacancy, the strong electronegative Au delta- formed is not favorable for CO adsorption. When peroxide is adsorbed on the CeO2(111) facet with the O vacancy, Aux was oxidized, resulting in stable Aux adsorption on the defective ceria surface with peroxide, which promotes CO adsorption on the Au-x/CeO2-x catalyst. With more Au atoms in supported Aux clusters, CO adsorption on this surface becomes stronger. During both the Au being supported on CeO2-x and CO being adsorbed on Au-x/CeO2-x, CeO2 acts as an electron buffer that can store/release the electrons. These results provide a scientific understanding for the development of high-performance rare earth catalytic materials.
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