Elemental mercury oxidation from flue gas by microwave catalytic oxidation over Mn/γ-Al2O3

The integrated microwave with Mn/gamma-Al2O3 and ozone was employed to oxidize elemental mercury (Hg-0) in simulated flue gas. Hg-0 oxidation efficiency in the integrated system attained 92.2%. Mn/gamma-Al2O3 catalyst was characterized by XRD, XPS, FT-IR, SEM. XPS spectra indicate the formation of a stable mercuric oxide species (HgO) from mercury oxidation. Ozone molecules in air could enhance free radical formation. Hg-0 was oxidized to Hg-0 in the presence of ozone and free radical. The coupling role between ozone and radical on mercury oxidation was formed. Microwave catalytic oxidation of elemental mercury reaction with the Mn/gamma-Al2O3 catalyst follows Langmuir-Hinshelwood kinetics. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.