Nanocrystalline zirconia(Zr O2) powders were prepared by a sol e gel process followed by annealing treatments from 500 to 1200 C. Phase transformation, microstr
Solid superacid SO42-/Zr O2-SiO2 was prepared by dip-impregnation method, and its catalytic activity was tested with esterification of p-nitrobenzoic acid and m