0000000000046246

AUTHOR

María José López-muñoz

showing 6 related works from this author

Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home-prepared titanium dioxide

2008

Abstract Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl alcohol (BA) and 4-methoxybenzyl alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterization of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both alcohols the main oxidation products were the corresponding aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA convers…

chemistry.chemical_classificationProcess Chemistry and TechnologyButanolAlcoholAldehydeCatalysisCatalysischemistry.chemical_compoundchemistryBenzyl alcoholAlcohol oxidationOrganic chemistryMethanolPartial oxidationApplied Catalysis A: General
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Home-prepared anatase, rutile, and brookite TiO2 for selective photocatalytic oxidation of 4-methoxybenzyl alcohol in water: reactivity and ATR-FTIR …

2009

5th European Meeting on Solar Chemistry and Photocatalysis -- OCT 04-08, 2008 -- Palermo, ITALY

AnataseSettore ING-IND/24 - Principi Di Ingegneria ChimicaAldehydesCatalystsChemistryBrookiteInorganic chemistryAlcoholSelective photooxidation 4-methoxybenzylalcohol TiO2 ATR-FTIRP-anisaldehydeCatalysischemistry.chemical_compoundOrganic-chemistryGreen routeRutilevisual_artvisual_art.visual_art_mediumPhotocatalysisAqueous suspensionReactivity (chemistry)Partial oxidationSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhysical and Theoretical Chemistry
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ESR study of photo-oxidation of phenol at low temperature on polycrystalline titanium dioxide

1994

The formation of oxygen radicals on hydrated TiO 2 (anatase) samples irradiated at 77 K in the near-UV region and their interaction with adsorbed phenol molecules have been studied by electron spin resonance. The results indicate that the irradiation determines the generation of O 2 H · and O − radicals which react with adsorbed phenol molecules. Phenol-derived radicals are generated after warming the sample at room temperature. A reaction mechanism is proposed on the basis of the observed species.

Reaction mechanismAnataseChemistryRadicalInorganic chemistrychemistry.chemical_elementPhotochemistryOxygenlaw.inventionchemistry.chemical_compoundAdsorptionlawTitanium dioxidePhenolElectron paramagnetic resonance
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Photocatalytic Oxidation of Cyanides in Aqueous Titanium Dioxide Suspensions

1997

The photocatalytic oxidation of free cyanides in aqueous suspensions containing polycrystalline TiO2(anatase) powders irradiated in the near-UV region has been investigated. The rate of cyanide photooxidation has been studied by varying the following operative parameters: (i) initial cyanide concentration; (ii) catalyst concentration; (iii) initial pH; (iv) power of irradiation; and (v) chloride ion concentration in the reacting mixture. Under the used experimental conditions the photoreaction proceeded at a measurable rate until the complete disappearance of cyanides. The kinetics of cyanide photooxidation is affected by the catalyst concentration, the chloride ion concentration, and the p…

Aqueous solutionCyanideInorganic chemistryCyanatePhotochemistryChlorideCatalysisCatalysischemistry.chemical_compoundAdsorptionchemistryTitanium dioxidePhotocatalysismedicinePhysical and Theoretical Chemistrymedicine.drugJournal of Catalysis
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Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home prepared titanium dioxide

2008

In this paper some intrinsic electronic properties of home prepared (HP) TiO2 catalysts were investigated by diffuse reflectance spectroscopy and quasi-Fermi level measurements. These powders were used for carrying out the photocatalytic oxidation of benzyl alcohol to benzaldehyde and CO2 in water; the selectivity for aldehyde formation was enhanced by the addition of small amounts of ethanol, a typical hole trap. The values of band gap, valence band and conduction band edges are almost identical for all the HP samples in which anatase phase is predominant, whereas appreciable differences can be noticed for an HP sample containing high amount of rutile phase. A comparative ATR-FTIR study of…

chemistry.chemical_classificationAnataseProcess Chemistry and TechnologyInorganic chemistryAldehydeCatalysisCatalysisBenzaldehydechemistry.chemical_compoundchemistryBenzyl alcoholTitanium dioxidePhotocatalysisSelectivityApplied Catalysis A: General
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Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home prepared titanium dioxide: 2. Intrinsic and surface features…

2008

Some intrinsic electronic properties of home prepared (HP) TiO2 catalysts were investigated by diffuse reflectance spectroscopy and quasi-Fermi level measurements. These powders were used for carrying out the photocatalytic oxidation of benzyl alcohol to benzaldehyde and CO2 in water; the selectivity for aldehyde formation was enhanced by the addition of small amounts of ethanol, a typical hole trap. The values of band gap, valence band and conduction band edges are almost identical for all the HP samples in which anatase phase is predominant, whereas appreciable differences can be noticed for an HP sample containing high amount of rutile phase. A comparative ATR-FTIR study of the HP cataly…

Settore ING-IND/24 - Principi Di Ingegneria ChimicaIn situ ATR-FTIR analysisPhotocatalysis AT-FTIR TiO2 Aromatic alcohols Aliphatic alcohol Selective oxidationTiO2Selective oxidationPhotocatalysisAromatic alcoholsAliphatic alcohol
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