Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 118

The results of the analysis indicated that many other elements exited on the
surface of AC, including O F, S, Cl, and Cu. These elements might exist on the
surface of AC as groups or other forms during the activation process, with O being
the most dominant element.
Fig. 5.17 shows surface chemical characteristics at locations 3 (0.2 m obser-
vation) and 4 (0.05 m observation) on the surface of A-AC treated by high tem-
perature removal. Almost all elements, except C, were desorbed by decomposing
SFGs for 10 h with protective inert gas at 1200 °C temperatures. The surface of the
treated A-AC became very clean. However, there were still extremely low traces of
O and Si elements at location 3, which may be due to incomplete desorption at some
complex surface structures.
Location 3 (A) Location 3 (B)
Location 4 (A) Location 4 (B)
Fig. 5.17 TEM micrographs and energy dispersive X-ray microanalysis of element compositions
on the surface of treated A-AC
5.4.2 Type of AC Sorbents
Four kinds of AC samples were used in the adsorption experiments, namely,
AC(XK), AC(YK), AC(MJ), and AC(MZ). All ACs were dried at a temperature of
100 °C for 2 h. Table 5.7 provides information on ACs, including their raw material,