Search results for "I.2"

showing 10 items of 662 documents

Environmentally Friendly Photocatalytic Oxidation of Aromatic Alcohol to Aldehyde in Aqueous Suspension of Brookite TiO(2)

2008

WOS: 000260509000008

chemistry.chemical_classificationGreen chemistryBrookite Tio2Settore ING-IND/24 - Principi Di Ingegneria ChimicaSelective photocatalysis Alcohol oxidation BrookiteAlcohol OxidationBrookiteAlcoholGeneral ChemistryAldehydeCatalysisCatalysischemistry.chemical_compoundchemistryvisual_artAlcohol oxidationSelective Photocatalysisvisual_art.visual_art_mediumPhotocatalysisOrganic chemistrySettore CHIM/07 - Fondamenti Chimici Delle TecnologieSelectivity
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Reactive Polymers: A Versatile Toolbox for the Immobilization of Functional Molecules on TiO2 Nanoparticles

2006

chemistry.chemical_classificationMaterials sciencechemistryFunctional importanceTio2 nanoparticlesNanotechnologyGeneral ChemistryPolymerGeneral MedicineCatalysisToolboxAngewandte Chemie
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Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

2013

The photoelectrocatalytic partial oxidation of 4-methoxybenzyl alcohol in aqueous solution irradiated by near-UV light was carried out in a three-electrode batch reactor. TiO2 films were either deposited by dip-coating of a TiO2 sol onto a Ti foil and subsequent calcination or generated on Ti plates by thermal oxidation in air at 400-700 degrees C. The effects of the anode preparation method and bias potential values on conversion and selectivity to the corresponding aldehyde were investigated. The photoelectrocatalytic results were compared with the photocatalytic and electrocatalytic ones. The results indicated that no reaction occurred during the electrocatalytic experiments, whereas the…

chemistry.chemical_classificationPhotoelectrocatalysis Titanium TiO2/Ti 4-Methoxybenzaldehyde Aromatic alcohols Green synthesisProcess Chemistry and TechnologyInorganic chemistryAlcoholAldehydeCatalysislaw.inventionchemistry.chemical_compoundchemistrylawBenzyl alcoholSaturated calomel electrodePhotocatalysisCalcinationReactivity (chemistry)Partial oxidationGeneral Environmental Science
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Overview on oxidation mechanisms of organic compounds by TiO2 in heterogeneous photocatalysis

2012

This review provides the reader with a general overview on heterogeneous photocatalytic oxidation mechanisms in the presence of TiO2, with a special address to conversion of aliphatic and aromatic organic species. The aim was to clarify the steps of the photo-oxidation of the various classes of compounds and to relate them with the properties of the catalysts and the experimental conditions used. Reactions carried out to perform complete degradation and photocatalytic partial oxidations have been deeply discussed. Recent isotopic studies highlighted new reaction pathways concerning partial oxidation of alcohols to aldehyde and oxidation of benzene while EPR investigations confirmed that not…

chemistry.chemical_classificationReaction mechanismRadicalOrganic ChemistryPhotochemistryAldehydeCatalysisCatalysischemistry.chemical_compoundchemistryOrganic reactionPhotocatalysisPartial oxidationSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhysical and Theoretical ChemistryPhotocatalysis Reaction mechanisms Organic reactions TiO2Benzene
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Aqueous selective photocatalytic oxidation of salicyl alcohol by TiO2 catalysts: Influence of some physico-chemical features

2021

Abstract Partial photocatalytic oxidation of salicyl alcohol (2-hydroxybenzyl alcohol) to salicylaldehyde in water was investigated under environmental friendly conditions in the presence of home-prepared and commercial TiO2 (Merck and Aeroxide P25) samples under UVA irradiation. The photocatalysts were characterized by using BET, XRD, SEM and/or TEM techniques. The effects of crystallinity degree, pH (3–11) and presence of a hole trap (ethanol) on the photocatalytic activity and product selectivity were investigated. 4-Hydroxybenzyl alcohol was also used to study the influence of the position of the substituent group in the aromatic ring. High alcohols conversion and product selectivity va…

chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria ChimicaAqueous solutionEthanolSubstituentSubstrate (chemistry)AlcoholGeneral ChemistryAldehydeCatalysischemistry.chemical_compoundchemistryEnvironmental friendly conditions Photocatalysis Salicyl alcohol Salicylaldehyde Salicylic acid Selective oxidationTiO2PhotocatalysisSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSelectivityNuclear chemistry
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Nanostructured rutile TiO2 for selective photocatalytic oxidation of aromatic alcohols to aldehydes in water

2008

WOS: 000253100100022

chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria ChimicaChemistryGeneral ChemistryBiochemistryAldehydeCatalysisCrystallinityColloid and Surface ChemistryTiO2 Rutile Selectice photocatalytic oxidation Aromatic Alcohol Aromatic AldehydesRutilePhotocatalysisOrganic chemistrySelectivity
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Kinetics of 4-Methoxybenzyl Alcohol Oxidation in Aqueous Solution in a Fixed Bed Photocatalytic Reactor

2010

WOS: 000280384800004

chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria ChimicaChromatographyAqueous solutionChemistryGeneral Chemical EngineeringInorganic chemistryKinetics4-Methoxybenzyl Alcohol photooxidation TiO2 Fixed bed photoreactorchemistry.chemical_elementAlcoholGeneral ChemistryOxygenAldehydeIndustrial and Manufacturing EngineeringCatalysischemistry.chemical_compoundPhotocatalysisPartial oxidationSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie
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Photocatalytic oxidation of trans-ferulic acid to vanillin on TiO2 and WO3-loaded TiO2 catalysts

2015

Abstract The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied by using various TiO2 and WO3-loaded TiO2 samples as catalysts. Different values of selectivity were obtained depending on the physico-chemical properties of the single samples and a vanillin selectivity of 10% was reached in the presence of the commercial TiO2 Merck. Higher selectivity values were obtained by impregnation of TiO2 with H2WO4 followed by calcination. The increased production of vanillin exhibited by the obtained WO3-loaded TiO2 powders was attributed to a reduced further oxidation of the aldehyde caused by the presence of the practically inactive tungsten trioxide hydrate on the…

chemistry.chemical_classificationSettore ING-IND/24 - Principi Di Ingegneria ChimicaVanillin synthesiWO3-loaded TiO2 photocatalystsVanillinInorganic chemistryTrans-ferulic acid oxidationGeneral ChemistryAldehydeTungsten trioxideCatalysislaw.inventionCatalysisFerulic acidchemistry.chemical_compoundPhotocatalysiSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistrylawPhotocatalysisCalcinationSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSelectivityCatalysis Today
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Concentration of amino acids using supported liquid membranes with di-2-ethylhexyl phosphoric acid as a carrier

1997

Abstract Basic studies of a procedure for extraction of amino acids using a supported liquid membrane containing di-2-ethylhexyl phosphoric acid are presented. The extractions are made from an aqueous donor phase with pH 3 to a more acidic acceptor phase and the mass transfer is driven by the proton gradient between these phases. For 0.01 mM tryptophan and with 1 M HCl as acceptor phase, an extraction efficiency of 60% is obtained, constant up to at least 12 h. This permits concentration enrichment factors linearly increasing with time up to values of at least 150. For higher amino acid concentrations, the extraction efficiency is constant only over shorter time intervals.

chemistry.chemical_classificationamino acidsphosphonic acidAqueous solutionChromatographyDEHPAChemistryExtraction (chemistry)TryptophanDi-(2-ethylhexyl)phosphoric acidBiochemistryAcceptorAnalytical ChemistryAmino acidchemistry.chemical_compoundMembranesupported liquid membrane extractiondi-2-ethylhexylEnvironmental ChemistryPhosphoric acidSpectroscopyAnalytica Chimica Acta
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Enhancing Selectivity In Photocatalytic Formation Of P-Anisaldehyde In Aqueous Suspension Under Solar Light Irradiation Via Tio2 N-Doping

2012

The photocatalytic partial oxidation of 4-methoxybenzyl alcohol to the corresponding aldehyde (p-anisaldehyde) was performed under simulated solar irradiation by using home prepared N-doped TiO2 catalysts. The photocatalysts were prepared by a sol–gel method, using TiCl4 as TiO2 precursor and NH4Cl, urea or NH4OH as N-doping sources. A commercial TiO2 (Degussa P25) was also used for comparison aims. The prepared catalysts were characterized by BET specific surface area, XRD, ESEM and UV-vis spectroscopy. The reactivity results show that (i) the doped catalysts are predominantly amorphous, and they show selectivity values far higher than those of the corresponding undoped ones and of well cr…

chemistry.chemical_classificationinorganic chemicalsChemistryInorganic chemistryGeneral ChemistryAldehydeCatalysisCatalysisSpecific surface areaMaterials ChemistryPhotocatalysisReactivity (chemistry)Partial oxidationIrradiationN doping TiO2 photocatalysis partial oxidationSelectivity
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