Characterization The High Dispersion Molybdenum Oxide On Silica Surface Using XRD Technique
| dc.contributor.author | F.A Abudelrhman, Mohmed | |
| dc.date.accessioned | 2017-11-27T10:18:47Z | |
| dc.date.available | 2017-11-27T10:18:47Z | |
| dc.date.issued | 2010 | |
| dc.description.abstract | The X-ray powder diffraction method is thus ideally suited for characterization and identification of polycrystalline phases. The main use of powder diffraction is to identify components in a sample by a search/match procedure. Silica (SiO2) supported molybena (MoO3) catalysts at loading varying between 3 and 6 wt% were prepared by impregnating support silica (SiO2) with an aqueous solution at different acidity levels (pH = 2, 4 and 6) of ammonium hepta molybdate. After stirring for 3 h, the excess water was slowly evaporated at 100°C. Moreover, the impregnated supports were further dried at 120°C for 24 h. The products thus obtained were calcined at 700 °C for 2 h in static atmosphere of air. X-ray powder diffractogram (XRD) for support (SiO2), supported (MoO3) and different loading levels (3, 4, 5 and 6 wt% MoO3/SiO2) catalysts at different PH`s were investigated. The results clearly revealed that the formation of highly dispersed MoO3 phase on the SiO2 surface at a loading levels of 3 wt%, at pH = 2, for 4 wt%, at pH = 4 and 5 wt%, at pH = 6. This indicts that, a weaker dispersion of MoO3 on SiO2 surface at low pH. Given that, at low pH = 2 the formation of MoO3 phase crystallites was observed at 2 wt%. Whereas, at high pH = 6 the form of MoO3 crystallites was observed at 6 wt%. These results can be reorganized on the basis of the different surface chemical properties of the oxide support and nature of oxide supported. | ar |
| dc.identifier.uri | https://repository.sebhau.edu.ly/handle/1/163 | |
| dc.language.iso | en | ar |
| dc.publisher | Sebha University | ar |
| dc.subject | Dispersion, SiO2, MoO3, pH, XRD. | ar |
| dc.title | Characterization The High Dispersion Molybdenum Oxide On Silica Surface Using XRD Technique | ar |
| dc.type | Article | ar |