STUDIES ON SO42- PROMOTED MIXED-OXIDE SUPERACIDS

Sulfated binary and trinary oxide solid superacids were prepared and c haracterized. The incorporation of Cr, Fe, Mn and V into sulfated zirc onia increases its superacidity and catalytic activity for n-butane is omerization at 35 degrees C significantly. The catalytic activity of s ulfated oxides of Cr-Zr, Fe-Cr-Zr and Fe-V-Zr is 2-3 times greater tha n that of the well-known sulfated Fe-Mn-Zr oxide. A negative effect wa s observed in the cases of sulfated Mn-Zr, Sn-Zr, W-Zr and Mo-Zr oxide s. The origin of the enhancement in superacidity and activity is discu ssed in the light of experimental results obtained by XRD, IR and chem ical analysis.