KINETIC BEHAVIOR OF ELEMENTAL MERCURY SORPTION ON CERIUM- AND LANTHANUM-BASED COMPOSITE OXIDES

Dongjing Liu, Weiguo Zhou and Jiang Wu
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Dongjing Liu: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, P. R. China†College of Mechanical Engineering, Tongji University, Shanghai 200092, P. R. China
Weiguo Zhou: #x2020;College of Mechanical Engineering, Tongji University, Shanghai 200092, P. R. China
Jiang Wu: #x2021;College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 02, 1-9

Abstract: The kinetic behavior of gas phase mercury sorption on ZSM-5 supported cerium- and lanthanum-based composite oxides in the temperature range of 120–240∘C is investigated. The Hg0 sorption abilities all first increase and then decrease with the elevation of the temperatures, the cerium-based composite oxides show better Hg0 sorption abilities than that of the lanthanum-based composite oxides. CeO2–Mn2O3/ZSM-5 performs the best Hg0 sorption ability with Hg0 removal efficiency of nearly 100% at 180∘C. Doping Cu or Mn into La2O3 lattice causes the decrease in the Hg0 removal efficiency of the lanthanum-based composite oxides due to the formation of perovskite or perovskite-like compounds. The sorption of elemental mercury over metal oxides is governed both by diffusion processes as well as chemical reactions, and the sorption of elemental mercury on the cerium- and lanthanum-based composite oxides are chemisorption processes.

Keywords: Elemental mercury; sorption; kinetics; cerium oxide; lanthanum oxide (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X1850141X

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