Abstract
The effects of transition metal promoters on the thermal stability of sulfated zirconia (SZ) were studied by XRD and Raman spectroscopy. After calcination at 750 °C, the proportion of the monoclinic phase in SZ and 2.7 wt% Fe–SZ were 58 and 13%, respectively. Ni showed a smaller effect and Co showed a negative effect for the stabilization of the tetragonal phase. The results were compared with those of nonsulfated Fe-loaded zirconia, and it was suggested that Fe forms a solid solution with sulfated zirconia.
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