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New insights into mercury removal mechanism on CeO(2)based catalysts: A first-principles study TEXT SIZE: A A A
First-principles calculations were performed to investigate the mechanism of Hg-0 adsorption and oxidation on CeO2(1 11). Surface oxygen activated by the reduction of Ce4+ to Ce3+ was vital to Hg-0 adsorption and oxidation processes. Hg-0 was fully oxidized by the surface lattice oxygen on CeO2(111), without using any other oxidizing agents. HCl could dissociate and react with the Hg adatom on CeO2(111)to form adsorbed Hg-Cl or Cl-Hg-Cl groups, which promoted the desorption of oxidized Hg and prevented CeO2 catalyst deactivation. In contrast, O-H and H-O-H groups formed during HCl adsorption consumed the active surface oxygen and prohibited Hg oxidation. The consumed surface oxygen was replenished by adding O-2 into the flue gas. We proposed that oxidized Hg desorption and maintenance of sufficient active surface oxygen were the rate-determining steps of Hg-0 removal on CeO2-based catalysts. We believe that our thorough understanding and new insights into the mechanism of the Hg-0 removal process will help provide guidelines for developing novel CeO2-based catalysts and enhance the Hg removal efficiency. (C) Higher Education Press and Springer-Verlag GmbH Germany 2018
 

Publication name

 FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING, 12 (2):10.1007/s11783-018-1007-1 APR 2018

Author(s)

 Li, Ling; He, Yu; Lu, Xia

Corresponding author(s) 

 HE Yu 
 heyu@mail.gyig.ac.cn  
 Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Guizhou, Peoples R China

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