Search results for "Surface oxygen"

showing 4 items of 4 documents

The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation

2015

12 figures, 2 tables

MorphologyNanocubesMaterials scienceInorganic chemistryNanoparticlechemistry.chemical_elementOxygenHydrothermal circulationCatalysisCatalysisCrystalchemistry.chemical_compoundCeriaSurface oxygen vacanciesEnvironmental Science(all)General Environmental ScienceNanotubesProcess Chemistry and TechnologyTolueneToluene oxidationNanostructuresCrystal sizechemistryNanoparticlesNanorodNanorodsToluene
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Oxygen Incorporation Reaction into Mixed Conducting Perovskites: a Mechanistic Analysis for (La,Sr)MnO3 Based on DFT Calculations

2009

Based on DFT calculations of intermediates and transition states, several hypothetical mechanisms for oxygen incorporation into mixed conducting La1-xSrxMnO3{plus minus}d perovskites are discussed. In the most probable mechanism, the rate-determining step comprises the encounter of a highly mobile surface oxygen vacancy and a molecular oxygen adsorbate. Starting from these results, the variation of reaction rates for different materials is explored.

Reaction rateSurface oxygenComputational chemistryChemistryVacancy defectchemistry.chemical_elementMolecular oxygenOxygenTransition stateProbable mechanismECS Transactions
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Highly Active Co3O4-Based Catalysts for Total Oxidation of Light C1–C3 Alkanes Prepared by a Simple Soft Chemistry Method: Effect of the Heat-T…

2021

9 figures, 2 tables.

inorganic chemicalsTechnologyInorganic chemistryTotal oxidationcobalt oxidechemistry.chemical_elementalkane oxidationpropaneHeterogeneous catalysissurface oxygen vacanciesMethaneArticleCatalysischemistry.chemical_compoundPropaneAlkane oxidationSurface oxygen vacanciesPropanetotal oxidationvolatile organic compoundsGeneral Materials ScienceReactivity (chemistry)Volatile organic compoundsCobalt oxideAlkanechemistry.chemical_classificationHeterogeneous catalysisEthaneMicroscopyQC120-168.85methaneTQH201-278.5ethaneEngineering (General). Civil engineering (General)TK1-9971heterogeneous catalysischemistryDescriptive and experimental mechanicsMixed oxideElectrical engineering. Electronics. Nuclear engineeringTA1-2040cobalt oxide; total oxidation; alkane oxidation; heterogeneous catalysis; volatile organic compounds; propane; ethane; methane; surface oxygen vacanciesCobaltMethaneMaterials; Volume 14; Issue 23; Pages: 7120
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Photoluminescence time decay of surface oxygen deficient centers in un‐doped and Ge‐doped silica

2005

We report a study of the emission decay from the singlet excited state of two fold coordinated Si and Ge centers stabilized on the surface of silica and Ge-doped silica. The PL lifetimes are of the order of nanoseconds and increase on decreasing the temperature. The results suggest that, for the surface centers, the phonon assisted intersystem-crossing process linking the excited states affects the decay rates, is effective down to low temperatures and is distributed because of the inhomogeneity of the defects. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

optical fiberSurface oxygenPhotoluminescenceradiation effectChemistryPhononDopingTime decayAnalytical chemistryNanosecondExcited stateradiation-induced attenuationSinglet stateAtomic physicsphysica status solidi (c)
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