The adsorption abilities for vapor-phase Hg 0 by a Ca-based sorbent were investigated in an attempt to produce more effective sorbents for the control of elemental mercury emission. Ca(OH) 2 and Mn x + doped in Ca(OH) 2 have been characterized by surface analytical methods, such as Brunauer−Emmett−Teller (BET) surface area, scanning electron micrographs (SEMs), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The mercury adsorption characteristic was also revealed by XPS. The results showed that mercury removal by Mn x + /Ca(OH) 2 was a bit higher than that by Ca(OH) 2 . From mercury speciation measurement, Hg 0 could be oxidized by MnO 2 effectively. From XPS analysis, there was a peak corresponding to the divalent mercury. Thus, there was oxidized mercury on the surface of Mn x + /Ca(OH) 2 . The presence of MnO 2 affected mercury speciation.
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Wang et al. (2011) studied this question.
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