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Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts
Author(s) -
Lv Qiang,
Cai Ming,
Wang Chang'an,
Zhang Zehan,
Che Defu
Publication year - 2018
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2208
Subject(s) - catalysis , flue gas , cerium , adsorption , chemistry , vanadium , mercury (programming language) , inorganic chemistry , chemical engineering , organic chemistry , computer science , programming language , engineering
The ever‐growing concern of mercury exhausted from coal‐fired boiler is driving the requirement for using novel catalysts with stable Hg 0 removal efficiency. However, the influences of flue gas components on Hg 0 removal performance of modified and deactivated catalysts have been seldom investigated previously. The antideactivation ability of modified catalysts is still unclear. In this study, cerium (Ce) and zirconium (Zr) were utilized to modify the honeycomb V 2 O 5 –WO 3 /TiO 2 catalysts. Sodium (Na) was doped on the rudimentary and modified catalysts by impregnation method to obtain deactivated catalysts. Elemental mercury removal efficiency of the catalysts was measured using a lab‐scale experimental system under various working conditions. Characterization of the catalysts was conducted to further analyze the mechanism of Hg 0 removal process. Physical adsorption plays an important role in Hg 0 removal over catalysts in the atmosphere of N 2 and O 2 . The introduction of SO 2 has an adverse effect on Hg 0 removal because of the competitive adsorption. NO and HCl motivate the Hg 0 removal through different mechanisms whereas NH 3 has little effect on the removal efficiency. Mars–Maessen mode could be responsible for the excellent Hg 0 removal performance and the splendid antideactivation ability of Ce‐modified catalysts. The efficiency of Zr‐modified catalysts is lower due to the decline of vanadium content.