A systematic review on the efficiency of cerium-impregnated activated carbons for the removal of gas-phase, elemental mercury from flue gas.
In the present systematic review, we aimed to collect and analyze all the relevant evidence on the efficiency of cerium-impregnated versus virgin-activated carbons (ACs) for the removal of gas-phase elemental mercury (Hg0) from the flue gas of coal-fired power plants and to assess the effect of different calcination and operational parameters on their efficiency. A total of eight relevant papers (out of 1193 hits produced by the search) met the eligibility criteria and were included in the study. Results indicated that the Hg0adsorption capacity of cerium-impregnated ACs is significantly higher than that of virgin ACs, depending highly on the impregnation and operational parameters. It was noticed that although cerium-impregnated ACs possessed smaller surface areas and pore volumes, their Hg0removal efficiencies were still higher than their virgin counterparts. An increased Hg0removal efficiency was in general found by increasing the operational adsorption temperature as high as 150-170 °C. Studies also indicated that NO, SO2, and HCl have promoting impacts on the Hg0removal efficiency of Ce-impregnated ACs, while H2O has an inhibitory effect.
Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran.
Mohammad Hossein
MH
Sowlat
Department of Environmental Health Engineering, Alborz University of Medical Sciences, Karaj, Iran.|Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Babak
B
Kakavandi
Department of Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Saeedeh
S
Lotfi
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Masud
M
Yunesian
Faculty of Pharmacy and Pharmaceutical Sciences Research Center and Endocrinology and Metabolism Research Centre, Tehran University of Medical Sciences, Tehran, 1417614411, Iran.
Mohammad
M
Abdollahi
Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran. rezaei.r@iums.ac.ir.|Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran. rezaei.r@iums.ac.ir.
Roshanak
R
Rezaei Kalantary
D000393:Air Pollutants / Q000302:isolation & purification*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D003031:Coal; D008628:Mercury / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D011210:Power Plants
D000393:Air Pollutants; D003031:Coal; D002606:Charcoal; D002563:Cerium; D008628:Mercury
Activated carbons; Cerium oxide; Elemental mercury; Flue gas; Impregnation; Vapor-phase