Search results for "WO3"
showing 6 items of 26 documents
Comparative Hybrid Hartree-Fock-DFT Calculations of WO2-Terminated Cubic WO3 as Well as SrTiO3, BaTiO3, PbTiO3 and CaTiO3 (001) Surfaces
2021
We greatly acknowledge the financial support via the ERAF Project No. 1.1.1.1/18/A/073. Calculations were performed using Latvian Super Cluster (LASC), located in the Center of Excellence at Institute of Solid State Physics, the University of Latvia, which is supported by European Union Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-Teaming Phase 2 under Grant Agreement No. 739508, project CAMART.
Apvienotā Eiropas Tora vakuumkameras volframa materiālu oksidēšanās dažādās vidēs
2020
Bakalaura darbā apkopota informācija par termisko kodolsintēzi, tokamakiem un to potenciālajiem negadījumiem – dzesēšanas un vakuuma zudumu –, divertora materiālu – volframu –, tā oksīdiem un oksidēšanās procesiem atkarībā no temperatūras, kā arī volframa un tā oksīdu reakcijām ar ūdeni. Volframa oksidēšanās procesu izpētei izmantota pulvera rentgendifraktometrijas, termiskās analīzes un elektronu mikroskopijas metode, lai raksturotu volframa struktūru, virsmas morfoloģiju un novērtētu mitruma ietekmi uz volframa oksidēšanos. Eksperimentālajā daļā veikta volframa paraugu karsēšana no istabas temperatūras līdz 1000°C sausā un mitrā sintētiskā gaisa plūsmā. Ar termogravimetrijas metodi noteik…
WO 3 as Additive for Efficient Photocatalyst Binary System TiO 2 /WO 3
2021
The financial support provided by Scientific Research Project for Students and Young Researchers No. SJZ/2018/9 implemented at the Institute of Solid State Physics, University of Latvia is greatly acknowledged. Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the Euro-pean Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART².
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…
Tungsten -catalysts supported on ZrO2 nanopowder
2009
Wo3 and ionic liquids: A synergic pair for pollutant gas sensing and desulfurization
2020
This review deals with the notable results obtained by the synergy between ionic liquids (ILs) and WO3 in the field of pollutant gas sensing and sulfur removal pretreatment of fuels. Starting from the known characteristics of tungsten trioxide as catalytic material, many authors have proposed the use of ionic liquids in order to both direct WO3 production towards controllable nanostructures (nanorods, nanospheres, etc.) and to modify the metal oxide structure (incorporating ILs) in order to increase the gas adsorption ability and, thus, the catalytic efficiency. Moreover, ionic liquids are able to highly disperse WO3 in composites, thus enhancing the contact surface and the catalytic abilit…