Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 109

5.3.1.3 Hg 0 Adsorption Ability of Zeolite

Hg 0 adsorption experiments by different zeolites were conducted under the same
conditions (Hg 0 concentration: 19.5 g/m 3 ; temperature: 125 °C; simulated flue gas:
BL; flow: 1 L/min; amount of sorbent: 100 mg). The respective adsorption kinetic
curves of Hg 0 by zeolite (FS), hydrogen-zeolite (H-FS), sodium-zeolite (N-FS), and
ammonium-zeolite (A-FS) are shown in Fig. 5.6. The sodium-zeolite had the
maximum Hg 0 adsorption quantity.

0.7

FS
H-FS
N-FS
A-FS

0.6

0.5

0.4

0.3

0.2

0.1

0.0

0 5 10 15 20 25 30 35

Time (min)

Fig. 5.6 Hg 0 adsorption by different zeolites

5.3.1.4 Hg 0 Adsorption Ability of Bentonite

Hg 0 adsorption experiments by bentonite and cetyltrimethylammonium bromide
(CTMAB)-modified bentonites were conducted under the same conditions (Hg 0
concentration: 18.4 g/m 3 , temperature: 125 °C, simulated flue gas: BL, flow: 1
L/min, amount of sorbent: 100 mg). The adsorption kinetic curves of Hg 0 by ben-
tonite (PT), 1% CTMAB-modified bentonite (PT1), 3% CTMAB-modified ben-
tonite (PT2), and 6% CTMAB-modified bentonite (PT3) are shown in Fig. 5.7. PT3
had the maximum adsorption quantity of Hg 0 , which had the biggest interlamellar
spacing of 2.78 nm through 6% CTMAB-modified bentonites.

0.7

PT
PT1
PT2
PT3

0.6

0.5

0.4

0.3

0.2

0.1

0.0

0 5 10 15 20 25 30 35

Time (min)

Fig. 5.7 Hg 0 adsorption by different bentonites