Study of zirconia microporous structure

The microporous structure of zirconium dioxide obtained by precipitation at different pH and different times of gel aging is studied by the physical a dsorption of nitrogen, oxygen, and molecular hydrogen. It is shown that the ratio between the supermicropore surface areas measured by the adsorption of O-2 and N-2 as a function of the supermicropore volume previously reveal ed for SnO2 is also retained for zirconia (the surface area of supermicropo res measured by O-2 adsorption is larger than that measured by N-2 adsorpti on). Possible reasons for this phenomenon are discussed. The conclusions on the factors responsible for the formation of the zirconia microporous stru cture are drawn.