Raman spectroscopic evidence for the existence of 6-molybdoaluminate entities on an Mo/Al2O3 oxidic precursor

Abstract

A study by Raman spectroscopy of the oxomolybdate surface phase present on an Mo/Al₂O₃ oxidic precursor reveals the presence of well dispersed 6-molybdoaluminate entities (AlMo₆O₂₄H₆ ^3-) on a 15 wt.% MoO₃ oxidic precursor. It is also shown that precipitation of an ammonium 6-molybdoaluminate salt occurs at higher Mo loadings.