The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres
The structure and the thermal behavior of WO3 samples in air and in reduction atmosphere were studied. The sample I was prepared by the dissolution of fine metallic tungsten powder in hydrogen peroxide followed by solvent evaporation in the air at 60°C. Sample II was obtained by draining a part o...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Association of Chemical Engineers of Serbia
2011-01-01
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| Series: | Hemijska Industrija |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0367-598X/2011/0367-598X1100009G.pdf |
| _version_ | 1818934613026799616 |
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| author | Georgijević Radovan Mentus Slavko |
| author_facet | Georgijević Radovan Mentus Slavko |
| author_sort | Georgijević Radovan |
| collection | DOAJ |
| description | The structure and the thermal behavior of WO3 samples in air and in reduction atmosphere were studied. The sample I was prepared by the dissolution of fine metallic tungsten powder in hydrogen peroxide followed by solvent evaporation in the air at 60°C. Sample II was obtained by draining a part of the sample I at 60°C and then heating it up to 430°C. By the means of X-ray diffractometry, scanning electron microscopy and thermal analysis it was evidenced that the sample I was the amorphous hydrated gel, with the WO3•1.5H2O composition, while the second one was the anhidrous monoclinic WO3 with the mean particle size of 100 nm. Additionally, using the thermogravimetric and the differential thermal analysis simultaneously in the reduction atmosphere, both samples types were examined. After reduction the distribution of the metal particles number in respect to the diameters of the anhidrous sample was examined using the electron microscopy. |
| first_indexed | 2024-12-20T05:07:03Z |
| format | Article |
| id | doaj.art-9277925c766f48399fe0dce90755822a |
| institution | Directory Open Access Journal |
| issn | 0367-598X |
| language | English |
| last_indexed | 2024-12-20T05:07:03Z |
| publishDate | 2011-01-01 |
| publisher | Association of Chemical Engineers of Serbia |
| record_format | Article |
| series | Hemijska Industrija |
| spelling | doaj.art-9277925c766f48399fe0dce90755822a2022-12-21T19:52:22ZengAssociation of Chemical Engineers of SerbiaHemijska Industrija0367-598X2011-01-0165327928610.2298/HEMIND101228009GThe synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheresGeorgijević RadovanMentus SlavkoThe structure and the thermal behavior of WO3 samples in air and in reduction atmosphere were studied. The sample I was prepared by the dissolution of fine metallic tungsten powder in hydrogen peroxide followed by solvent evaporation in the air at 60°C. Sample II was obtained by draining a part of the sample I at 60°C and then heating it up to 430°C. By the means of X-ray diffractometry, scanning electron microscopy and thermal analysis it was evidenced that the sample I was the amorphous hydrated gel, with the WO3•1.5H2O composition, while the second one was the anhidrous monoclinic WO3 with the mean particle size of 100 nm. Additionally, using the thermogravimetric and the differential thermal analysis simultaneously in the reduction atmosphere, both samples types were examined. After reduction the distribution of the metal particles number in respect to the diameters of the anhidrous sample was examined using the electron microscopy.http://www.doiserbia.nb.rs/img/doi/0367-598X/2011/0367-598X1100009G.pdfelectron microscopyreduction in hydrogen atmospherethermal analysistungstentungsten trioxide |
| spellingShingle | Georgijević Radovan Mentus Slavko The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres Hemijska Industrija electron microscopy reduction in hydrogen atmosphere thermal analysis tungsten tungsten trioxide |
| title | The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| title_full | The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| title_fullStr | The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| title_full_unstemmed | The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| title_short | The synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| title_sort | synthesis of tungsten trioxide gel by dissolution of tungsten in hydrogen peroxide and its transformations during the heat treatment in oxidation and reduction atmospheres |
| topic | electron microscopy reduction in hydrogen atmosphere thermal analysis tungsten tungsten trioxide |
| url | http://www.doiserbia.nb.rs/img/doi/0367-598X/2011/0367-598X1100009G.pdf |
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