0000000000303658

AUTHOR

Alla Spojakina

showing 2 related works from this author

Phase formation in mixed TiO2-ZrO2 oxides prepared by sol-gel method

2011

Pure titania, zirconia, and mixed oxides (3—37 mol.% of ZrO2) are prepared using the sol-gel method and calcined at different temperatures. The calcined samples are characterized by Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption porosimetry. Measurements reveal a thermal stability of the titania anatase phase that slightly increases in the presence of 3—13 mol.% of zirconia. Practically, the titania anatase-rutile phase transformation is hindered during the temperature increase above 700 C. The mixed oxide with 37 mol.% of ZrO2 treated at 550 C shows a new single amorphous phase with a surface area of the…

Anatasex ray scatteringMaterials scienceelectron microscopyScanning electron microscopeMineralogysrilankite Rietveld method.Inorganic Chemistryx ray scattering; electron microscopyChemical engineeringTransmission electron microscopyPhase (matter)Materials ChemistryMixed oxideTiO2—ZrO2 mixed oxidesol-gel methodCubic zirconiaPhysical and Theoretical ChemistryPowder diffractionSol-gelSettore CHIM/02 - Chimica Fisica
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Nanoparticles of AlTiZr mixed oxides as support of hydrodesulfurizaton catalysts: Synthesis and characterisation

2012

Abstract TiAlZr mixed oxides, synthesized using sol–gel method, were characterized and used as supports of hydrodesulfurization catalysts (12 wt% Mo) prepared by impregnation either with molybdenum heteropolyacid H3PMo12O40 or its cobalt salt Co1.5PMo12O40. Structure, morphology and textural properties of oxides and catalysts were characterized using X-ray powder diffraction (XRD), Raman spectroscopy, Nitrogen adsorption porosimetry, TEM-EDS, temperature-programmed desorption (TPD) and temperature-programmed reduction (TPR) techniques. Activity of the catalytic systems was tested in thiophene hydrodesulfurization (HDS). No formation of a new oxide phase was revealed in the synthesized mixed…

Materials scienceMechanical EngineeringInorganic chemistryMetals and AlloysOxidechemistry.chemical_elementCatalysisMixed oxides supports Sol–gel process Co-Mo-P-catalysts Thiophene hydrodesulfurizationchemistry.chemical_compoundchemistryMechanics of MaterialsMolybdenumDesorptionMaterials ChemistryThiopheneCobaltHydrodesulfurizationSol-gelSettore CHIM/02 - Chimica Fisica
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