PREPARATIONS OF NEW POROUS OXIDES SPHERICAL POWDERS BY SPRAY REACTION TECHNIQUE

New porous ZrO₂、ZrO₂（Y₂O₃）、Al₂O₃、SnO₂、and SnO₂ spherical powders were prepared by novel spray reaction method.SEM,TEM/HRTEM,BET surface area,and XRD characterizations show that the average diameters of the obtained porous oxides powders are ＜3 μm,and particles are fairly spherical morphology with smooth surface.The spherical oxides particles possess three kinds of microstructures:homogeneous porous structure,porous structure with a loose core and dense shell,and hollow porous structure.After calcinations BET surface areas of porous oxides powders are c-ZrO₂（700 ℃）:～31.0 m²/g,t-ZrO₂（Y₂O₃）（600 ℃）:～34.9 m²/g,α-Al₂O₃（1 200 ℃）:～170 m²/g,respectively.