Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 122

Fig. 5.20 AC(MJ) Hg 0 adsorption in the N 2 environment
Fig. 5.21 AC(MZ) Hg 0 adsorption in N 2 environment
There were also significant differences in the adsorption of Hg 0 between
AC(XK)\AC(YK)\AC(MJ) and AC(MZ). The reason for the different adsorption
phenomena had no connection with the form of AC (Figs. 5.18 to 5.21). Further
analyses were conducted using Autosorb/1/C in order to explore the influences of
surface physical characteristics on AC adsorbing Hg 0 .
The surface physical characteristics of AC(XK), AC(YK), AC(MJ), and
AC(MZ) were basically similar, except for quantity (Table 5.8). For example, the
pore volume of AC(YK) was 0.48 cm 3 /g, whereas that of AC(MZ) was 0.94 cm 3 /g.
However, the difference in quantity was unlikely to induce such significant dif-
ferences in the adsorption of Hg 0 between AC(XK)\AC(YK)\AC(MJ) and
AC(MZ).
The three samples (AC(XK)/AC(YK)/AC(MJ)) were derived from different
raw materials, namely apricot shell (XK), coconut shell (YK) and coal (MJ), and
were all activated by steam. Steam activation is a common activation technique for
AC production and is effective in creating more surface area physically by opening
up more micropores. The surfaces of AC(XK), AC(YK), and AC(MJ) had no spe-