Removal of gaseous elemental mercury from simulated syngas over Fe2O3/TiO2 sorbents

Chemical and Process Engineering

“…Wang et al (2018) also indicated that the Hg(0) removal efficiency was increased from 85.9 to 96.9%, while the concentration of H 2 S was increased from 200 to 800 ppm in the simulated gas. Wu et al (2021) and Xing et al (2022) also had similar reports. The Fe 2 O 3 or Fe 2 O 3 /TiO 2 mixture sorbents showed a great Hg(0) capture rate in a temperature range of 100 to 150 • C when H 2 S was present in the simulated gas (Wu et al, 2021;Xing et al, 2022).…”

“…Wu et al (2021) and Xing et al (2022) also had similar reports. The Fe 2 O 3 or Fe 2 O 3 /TiO 2 mixture sorbents showed a great Hg(0) capture rate in a temperature range of 100 to 150 • C when H 2 S was present in the simulated gas (Wu et al, 2021;Xing et al, 2022). This temperature range was also an optimal range for H 2 S removal using Fe 2 O 3 /AC sorbent.…”

“…The Fe 2 O 3 /AC sorbent captured the H 2 S from the simulated gas, H 2 S performed as the active site on the sorbent. And then it reacted with Hg(0) from the simulated gas (Wang et al, 2022) But Xing et al (2022 also noted that other gas components in the simulated gas, such as CO, H 2 and H 2 O, inhibited the Hg(0) removal efficiency. Nevertheless, they showed over 80% of the Hg(0) capture rate (Xing et al, 2022).…”

“…Hg(0) adsorbed onto the sorbent reacts with the sulfides and forms mercury sulfides (Fig. 5a) Xing et al, 2022). This mechanism is described by the following postulated Equations ( 65) to ( 68):…”

“…In this case, the activated surface sulfur reacts with gas phase Hg(0) to create stable HgS. Consequently, there are some proposed Equations from ( 69) to (71) (An et al, 2023;Wu et al, 2021;Xing et al, 2022;Xue et al, 2015): the MnO 2 sorbent. The effectiveness of Hg(0) capture was increased from 82.3% to 90.5%, when the temperature was increased from 80 • C to 160 • C, in the 400 ppm H 2 S gas solution in N 2 .…”