The adsorbent clay has been characterized by SEM, EDXA, nitrogen
adsorption and TGA techniques. SEM image of the clay is
depicted in Fig. 3. The fresh clay contained 14.7% of ash. The
EDXA results revealed that the main components of the clay were
Si and Al (Table 4). The specific surface area of the fresh clay
according to nitrogen adsorption was 151 m
2
/g
and the micropore
volume 0.053 cm
3
/g
cat
cat
measured by Dubinin method, whereas