Catalysis and the Nature of Mixed-metal Oxides at the Nanometer Level: Special Properties of MOx/TiO2(110) {M= V, W, Ce} Surfaces

Journal Article · Wed Jun 23 04:00:00 EDT 2010 · Physical Chemistry Chemical Physics

DOI:https://doi.org/10.1039/c003665j· OSTI ID:989174

Rodriguez, J A; Stacchiola, D

To rationalize structure-reactivity relationships for mixed-metal oxide catalysts, well-defined systems are required. Studies involving the deposition of nanoparticles and clusters of VO{sub x}, CeO{sub x} and WO{sub x} on TiO{sub 2}(110) and other well-defined oxide surfaces have shown novel structures that have special chemical properties. Dimers of vanadia and ceria have been found on TiO{sub 2}(110), monomers of vanadia on CeO{sub 2}(111), and (WO{sub 3}){sub 3} clusters on TiO{sub 2}(110). The VO or WO groups present in VO{sub x}/TiO{sub 2}(110), VO{sub x}/CeO{sub 2}(111) and WO{sub x}/TiO{sub 2}(110) surfaces dislay a very high activity for the selective oxidation of alkanes and the dehydrogenation of alcohols. The non-typical coordination modes imposed by TiO{sub 2}(110) on ceria nanoparticles make possible the direct participation of this oxide in catalytic reactions and enhance the dispersion of metals on the titania substrate. Au/CeO{sub x}/TiO{sub 2}(110) surfaces display an extremely high catalytic activity for CO oxidation and the water-gas shift reaction. In general, the chemical behavior of the MOx/TiO{sub 2}(110) {l_brace}M = V, Ce or W{r_brace} surfaces reflects their unique structure at the nanometer level. These simple models can provide a conceptual framework for modifying or controlling the chemical properties of mixed-metal oxides and for engineering industrial catalysts.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 989174
• Report Number(s): BNL--91145-2010-JA; KC0302010
• Journal Information: Physical Chemistry Chemical Physics, Journal Name: Physical Chemistry Chemical Physics Journal Issue: 33 Vol. 12; ISSN 1463-9076
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALCOHOLS
ALKANES
CATALYSIS
CATALYSTS
CHEMICAL PROPERTIES
DEHYDROGENATION
DEPOSITION
DIMERS
MONOMERS
OXIDATION
OXIDES
WATER GAS
national synchrotron light source