Efficient removal of Hg ⁰ from cement kiln flue gas using Ce x Fe y O z composite catalyst.

Publisher: Springer Country of Publication: Germany NLM ID: 9441769 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1614-7499 (Electronic) Linking ISSN: 09441344 NLM ISO Abbreviation: Environ Sci Pollut Res Int Subsets: MEDLINE

Publication: <2013->: Berlin : Springer
Original Publication: Landsberg, Germany : Ecomed

Air Pollutants*/analysis ; Mercury*/analysis; Oxidation-Reduction ; Temperature ; Oxygen

In this study, a kind of Ce x Fe y O z composite with oxygen vacancy structure and strong oxygen storage capacity was prepared by coprecipitation method. Under the condition of no HCl of flue gas, the Hg ⁰ in the flue gas of cement kiln was efficiently and economically removed by using 6-8% oxygen. The results showed that the optimum preparation conditions of the catalyst were Ce-Fe molar ratio of 1-11 and calcination temperature of 550 °C. In addition, the reaction temperature, space velocity, the concentration of O 2 , SO 2 , and NO had significant effects on the removal efficiency of Hg ⁰ at different rates. More precisely, at the reaction temperature of 350 °C, low airspeed, high concentration of O 2 , and low concentration of SO 2 and NO, the efficiency reached the highest value. According to XPS results, the elemental valence of the Ce x Fe y O z composite changed after the reaction. The redox pairs of Ce ³⁺ -Ce ⁴⁺ and Fe ³⁺ -Fe ²⁺ had the ability to transfer electrons, which enabled more oxygen adsorbed on the catalyst surface to be converted into O 2 ^- , leading to the improvement of the oxidation efficiency of Hg ⁰ .
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

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No. 2022JDRC0101 the Science and Technology Department of Sichuan Province; No. 21676032 National Natural Science Foundation of China; No. KYTZ202014 Chengdu University of Information Technology; No. J201513 Chengdu University of Information Technology; No. 14TD0020 Education Department of Sichuan Province; No. 2016-GH02-00032-HZ Chengdu Science and Technology Bureau; No. 2015-HM01-00127-SF Chengdu Science and Technology Bureau

Keywords: Cement kiln flue gas; Chemisorbed oxygen; Coprecipitation method; Electron transfer; Elemental mercury removal; Oxygen vacancy structure

0 (Air Pollutants)
S88TT14065 (Oxygen)
FXS1BY2PGL (Mercury)

Date Created: 20230601 Date Completed: 20230717 Latest Revision: 20240327

20240327

10.1007/s11356-023-27781-w

37261688