The phase state,chemical structure,surface morphology,specific surface areas and mesoporous structure of the synthesized silica- based xerogels were measured systemically by means of X-ray diffraction(XRD),infrared spectrum (FTIR),transmission electron microscope(TEM),and N_2 adsoption-desoption(BET)techniques,re- spectively.

Catalyst activity was determined by not only specific surface area of catalyst but also the distributions of active center and utilization ratio of internal surface.

A method for measuring the specific surface area and pore volume of ion-exchange resin by N_2 absorption apparatus is introduced.

Effect of pretreated by K_2Cr_2O_7 solution and activated on specific surface area of carbon fiber;

Variation of pore structure of semi-coke with temperature and spatial location during pyrolysis ——Porosity,specific surface area and pore size distribution;

Calculation of the specific surface area of the froth in flotation;

Determination of catalyst′s specific area by LN_2;

The results show that,when the contents of titanium increase,the specific area of these hybrid materials increase accordingly.

By regressive analyzing the relation between specific area and water retention value (WRV) of the bleached eucalyptus KP can be expressed with a logarithm regressive equation as follows:y=127.

Effect of pyrolysis conditions on the char surface area and pore distribution;

Influence of preparing technology on specific surface area and oil absorption value in thepreparation of precipitated silica;

Determination of the Surface Area of Catalyst Support by Gas Chromatography;