Journal Title
Title of Journal: Top Catal
|
Abbravation: Topics in Catalysis
|
|
|
|
|
|
|
|
Authors: José J Plata Antonio M Márquez Javier Fdez Sanz Rafael Sánchez Avellaneda Francisca RomeroSarria María Isabel Domínguez Miguel Angel Centeno José Antonio Odriozola
Publish Date: 2011/01/22
Volume: 54, Issue: 1-4, Pages: 219-228
Abstract
A series of titanium oxide catalysts modified with yttrium has been prepared by sol–gel method and their structural properties have been studied The incorporation of yttrium in the titania lattice favors the formation of oxygen vacancies while at low Y loadings the anatase structure is preserved The catalytic activity of these solids for CO oxidation is found to be significantly dependent on their physical properties In particular the amount of dopant controls the number of surface oxygen vacancies created as well as the gold particle size which directly affects the catalytic activity Also a linear relationship between the catalytic activity and the band gap values which depend on the Y loading is observed Density functional theory based calculations show that Y atoms are incorporated at the TiO2 surface at substitutional positions only while the preferred oxygen vacancies arise by removing the bridge surface oxygen atoms These Ovacancies are the preferential adsorption sites for Au atoms and nanoparticles acting as nucleation centers that favor the dispersion of the catalyst active phase over the support surface In agreement with experiment Y doping is found to decrease the band gap of the support due to a destabilization of the valence band of the oxideThis work was funded by the Ministerio de Ciencia e Innovación Spain grants ENE200914522C0501 MAT200804918 and CSD00023 cofinanced by FEDER from European Union and the Junta de Andalucía project P08FQM03661 RomeroSarria thanks the Spanish MEC for her contract Ramón y Cajal Programme The Red Española de Supercomputación RESBSC provided part of the computer time
Keywords:
.
|
Other Papers In This Journal:
- Investigation of the Impact of Calcium, Zinc and Phosphorus on DeNO x Activity of a Commercial SCR Catalyst
- Acrylonitrile from Biomass: Still Far from Being a Sustainable Process
- Characterization and Activity of Pd–Ir Catalysts in CO and C 3 H 6 Oxidation Under Stoichiometric Conditions
- Nano Design of Alumina Supported Monometallic Catalysts: A Promising Way to Improve the Selective Hydrogenation of Poly-Unsaturated Hydrocarbons
- Selective Nanocatalysis of Organic Transformation by Metals: Concepts, Model Systems, and Instruments
- New Insights on Kinetic Versus Thermodynamic Ratios in Catalyzed Alkene Isomerization
- Insights into the Reactivity of Thiophene: Heterogeneous Alkylation
- Hydrogenation of the Aromatics and Olefins in FCC Gasoline During Deep Desulphurisation
- Effect of Ce Doping on the Performance and Stability of Strontium Cobalt Ferrite Perovskites as SOFC Anode Catalysts
- Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves
- Nanoscale Optimization and Statistical Modeling of Photoelectrochemical Water Splitting Efficiency of N-Doped TiO 2 Nanotubes
- Enhanced Stability of Fe 2 O 3 -Doped FeVO 4 /TiO 2 –WO 3 –SiO 2 SCR Catalysts
- Enhanced Stability of Fe 2 O 3 -Doped FeVO 4 /TiO 2 –WO 3 –SiO 2 SCR Catalysts
- The 16th International Symposium on Relations Between Homogeneous and Heterogeneous Catalysis (ISHHC-16), Sapporo, August 4–9, 2013
- The Catalyst Selectivity Index (CSI): A Framework and Metric to Assess the Impact of Catalyst Efficiency Enhancements upon Energy and CO 2 Footprints
- Optimum Performance of Vanadyl Pyrophosphate Catalysts
- Deactivation of Diesel Oxidation Catalysts by Sulphur in Laboratory and Engine-Bench Scale Aging
- Fe-ZSM-5 Catalyst Prepared by Ion Exchange from Fe(acac) 3 : Application into NH 3 -SCR of NO
- Ethanol Reforming Reactions Over Co and Cu Based Catalysts Obtained from LaCoCuO 3 Perovskite-Type Oxides
- Higher Alcohol Synthesis Using K-Doped CoRhMoS 2 /MWCNT Catalysts: Influence of Pelletization, Particle Size and Incorporation of Binders
- Selective Hydrogenation of 4-Nitrobenzaldehyde to 4-Aminobenzaldehyde by Colloidal RhCu Bimetallic Nanoparticles
- Etherification of 5-Hydroxymethylfurfural to a Biodiesel Component Over Ionic Liquid Modified Zeolites
- Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH 3 -SCR Applications
- Evidence for Diffusion-Controlled Hydrocarbon Selectivities in the Fischer–Tropsch Synthesis Over Cobalt Supported on Ordered Mesoporous Silica
- CO Dissociation at Vacancy Sites on Hägg Iron Carbide: Direct Versus Hydrogen-Assisted Routes Investigated with DFT
- Some Attempts in the Rational Design of Heterogeneous Catalysts Using Density Functional Theory Calculations
- Effect of Ag, Cu, and Au Incorporation on the Diesel Soot Oxidation Behavior of SiO 2 : Role of Metallic Ag
- The Denitridation of Nitrides of Iron, Cobalt and Rhenium Under Hydrogen
- The Selective Oxidation of Methanol on Iron Molybdate Catalysts
- Solar Thermal Hydrogen Production from Water over Modified CeO 2 Materials
- Engineered CNT Support for Selective Hydrogenation Reactions
- The Electronic Structure of Saturated NaCl and NaI Solutions in Contact with a Gold Substrate
- Cellulase Immobilized Nanostructured Supports for Efficient Saccharification of Cellulosic Substrates
|