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Journal of Materials Science
Erschienen in: Journal of Materials Science 14/2018

05.04.2018 | Chemical routes to materials

Mechanism of Hg0 oxidation in the presence of HCl over a CuCl2-modified SCR catalyst

verfasst von: Chuanmin Chen, Wenbo Jia, Songtao Liu, Yue Cao

Erschienen in: Journal of Materials Science | Ausgabe 14/2018

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Abstract

CuCl2-SCR catalysts prepared by an improved impregnation method were examined to evaluate the catalytic activity for gaseous elemental mercury (Hg0) oxidation in the presence of HCl at the typical SCR reaction temperature of 350 °C. It was found that Hg0 oxidation activity of commercial SCR catalyst was significantly improved by the introduction of CuCl2. The X-ray fluorescence and Hg0 temperature-programmed desorption (Hg0-TPD) methods were employed to characterize the catalysts. The results indicated that CuCl2 on CuCl2-SCR catalyst could release active Cl species in the presence of O2 at 350 °C, and the released active Cl species could be replenished in the presence of gas-phase HCl. CuCl2-SCR catalyst possessed the appropriate active sites for the adsorption of NH3 and HCl, which could scavenge the inhibiting effect of NH3 on Hg0 oxidation. Hg0-TPD results suggested that the oxidized mercury compounds mainly exited as HgCl2 once HCl was present. The Hg0 oxidation mechanism over CuCl2-SCR catalyst in the presence of HCl could be explained as follows: The adsorbed Hg0 reacted with active Cl species released by CuCl2 to form HgCl2. The reduced CuCl was re-chlorinated to CuCl2 via the intermediate copper oxychloride (Cu2OCl2) formation by being exposed to the gas-phase HCl.
Vorheriger Artikel Co/Mn co-doped TiO2 nanotube arrays for enhanced photoelectrochemical properties: experimental and DFT investigations
Nächster Artikel Interfacial liquid phase-driven removal of copper ions for bioavailable hyperbranched polytriazoles

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Metadaten
Titel
Mechanism of Hg0 oxidation in the presence of HCl over a CuCl2-modified SCR catalyst
verfasst von
Chuanmin Chen
Wenbo Jia
Songtao Liu
Yue Cao
Publikationsdatum
05.04.2018
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 14/2018
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-2287-3

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