Journal Title
Title of Journal: Top Catal
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Abbravation: Topics in Catalysis
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Authors: I AlShankiti F AlOtaibi Y AlSalik H Idriss
Publish Date: 2013/06/18
Volume: 56, Issue: 12, Pages: 1129-1138
Abstract
A series of cerium oxide based materials for hydrogen production from water was studied by temperatureprogrammed reduction Xray diffraction and Xray photoelectron spectroscopy XPS in addition to thermal reactions with water vapour The addition of uranium ions into CeO2 making mixed oxides Ce x U1−x O2 resulted in noticeable modification of the reduction properties of CeO2 with the main observations being the decrease in reduction temperature and the increase of hydrogen consumption when compared to CeO2 alone XPS U4f of the as prepared Ce05U05O2 showed the presence of large amounts of U6+ cations at 3809 eV in addition to the U4+ cations at 3799 eV the ratio U4+ to U6+ cations was found equal to 035 XPS Ce3d showed on the contrary considerable amount of Ce3+ cations with an estimated ratio of Ce3+ to Ce4+ = ca 05 Arions sputtering results in decreasing the U6+ contribution and a dramatic increase of the Ce3+ contribution The decrease of U6+ cations was however not mirrored by the increase in Ce3+ cations After five minutes of Ar ions sputtering 1 kV 10 mA the surface and near surface Ce3d line shapes looked closer to those of Ce2O3 with prominent Ce3d5/2 and Ce3d3/2 lines at 8856 and 9040 eV attributed to v′ and u′ respectively The Ce x U1−x O2 series was tested for hydrogen production from water where x = 0 025 05 075 and 1 All uranium containing oxides had higher activity than CeO2 or UO2 alone Ce075U025O2 was found to have the highest activity in the studied series about one order of magnitude higher than that of CeO2 alone at the same temperature The reason for the enhanced activity is linked to the ease by which oxygen ions are removed from the oxide materials
Keywords:
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- 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
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- 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
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- Evidence for Diffusion-Controlled Hydrocarbon Selectivities in the Fischer–Tropsch Synthesis Over Cobalt Supported on Ordered Mesoporous Silica
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- Engineered CNT Support for Selective Hydrogenation Reactions
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