Characterization The High Dispersion Molybdenum Oxide On Silica Surface Using XRD Technique
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Date
2010
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Publisher
Sebha University
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.
Description
Keywords
Dispersion, SiO2, MoO3, pH, XRD.