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Role of Ceria in the Design of Composite Materials for Elemental Mercury Removal
Author(s) -
Jampaiah Deshetti,
Chalkidis Anastasios,
Sabri Ylias M.,
Bhargava Suresh K.
Publication year - 2019
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.201800161
Subject(s) - flue gas , mercury (programming language) , elemental mercury , flue , waste management , pollution , coal , scope (computer science) , adsorption , process engineering , environmental science , materials science , chemistry , computer science , engineering , ecology , organic chemistry , biology , programming language
Abstract The necessity to drastically act against mercury pollution has been emphatically addressed by the United Nations. Coal‐fired power plants contribute a great deal to the anthropogenic emissions; therefore, numerous sorbents/catalysts have been developed to remove elemental mercury (Hg 0 ) from flue gases. Among them, ceria (CeO 2 ) has attracted significant interest, due to its reversible Ce 3+ /Ce 4+ redox pair, surface‐bound defects and acid‐base properties. The removal efficiency of Hg 0 vapor depends among others, on the flue gas composition and temperature. CeO 2 can be incorporated into known materials in such a way that the abatement process can be effective at different operating conditions. Hence, the scope of this account is to discuss the role of CeO 2 as a promoter, active phase and support in the design of composite Hg 0 sorbents/catalysts. The elucidation of each of these roles would allow the integration of CeO 2 advantageous characteristics to such degree, that tailor‐made environmental solution to complex issues can be provided within a broader application scope. Besides, it would offer invaluable input to theoretical calculations that could enable the materials screening and engineering at a low cost and with high accuracy.