Solid state reaction of MoO3–CeO2 complex oxide studied by Raman spectroscopy

The effects of MoO3 content and calcination temperature on the solid-state reaction of MoO3–CeO2 complex oxide were studied by Raman spectroscopy and XRD. Depending on the MoO3 content, molybdenum oxide species were found to exist as the highly dispersed molybdate, crystalline Ce8Mo12O49 and Ce2Mo4O15 for the MoO3–CeO2 complex oxide calcined at 500 °C resulting from the solid-state reaction between MoO3 and CeO2. Such a solid–state reaction is promoted at higher temperature. However, Ce2Mo3O13 is observed for 20% MoO3–CeO2 sample under O2 atmosphere, which indicates Ce2Mo3O13 is formed firstly and then it is transformed into Ce8Mo12O49 at higher temperature during the solid-state reaction.

Figure optionsDownload as PowerPoint slideHighlights
► The solid-state reaction of MoO3–CeO2 was studied by Raman and XRD.
► Molybdenum oxide species exist as molybdate, Ce8Mo12O49 and Ce2Mo4O15.
► The solid-state reaction is promoted at higher temperature and under O2 atmosphere.