Adsorption of argon on non-porous silica     Supercritical adsorption of methane on active carbon

Estimation of surface area for carbonaceous adsorbents

While the validity of the surface area determination for microporous solids has been questioned, 2 it can be used as a parameter for comparison of different samples. We applied Equation 9 for estimation of surface area of two types of carbonaceous adsorbents (active carbon and activated carbon cloth). Experimental data of nitrogen adsorption at 77K are presented in Figure 3 . In Table 1 the values calculated from Equation 9 and BET theory are reported. It can be seen that for a much wider relative pressure interval, reliable values are obtained.

Figure 3 Adsorption Data of Nitrogen (77K) on Active Carbon and Active Carbon Cloth

Table 1 Values of Surface Area Calculated from BET and Langmuir Generalized Equations
S [m2/g]
Range of p/po
Active carbon
Active carbon cloth
BET
0.05 - 0.35
1130 ± 5%
970 ± 5%
Langmuir generalized
0.005 - 0.60
1210 ± 5%
1035 ± 5%
Adsorption of argon on non-porous silica     Supercritical adsorption of methane on active carbon