期刊
CHEMICAL ENGINEERING JOURNAL
卷 275, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.04.022
关键词
Heterogeneous elemental mercury oxidation; Cupric chloride; gamma-Al2O3; Redox catalyst; Coal combustion flue gas
资金
- National Science Foundation, NSF [1151017]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1151017] Funding Source: National Science Foundation
In our previous studies, CuCl2 demonstrated excellent Hg(0) oxidation capability and holds potential for Hg(0) oxidation in coal-fired power plants. In this study, the properties and performances of CuCl2 supported onto gamma-Al2O3 with high surface area were investigated. From various characterization techniques using XPS, XAFS, XRD, TPR, SEM and TGA, the existence of multiple copper species was identified. At low CuCl2 loadings, CuCl2 forms copper aluminate species with gamma-Al2O3 and is inactive for Hg(0) oxidation. At high loadings, amorphous CuCl2 forms onto the gamma-Al2O3 surface, working as a redox catalyst for Hg(0) oxidation by consuming Cl to be converted into CuCl and then being regenerated back into CuCl2 in the presence of O-2 and HCl gases. The 10%(wt) CuCl2/gamma-Al2O3 catalyst showed excellent Hg(0) oxidation performance and SO2 resistance at 140 degrees C under simulated flue gas conditions containing 6%(v) O-2 and 10 ppmv HCl. The oxidized Hg(0) in the form of HgCl2 has a high solubility in water and can be easily captured by other air pollution control systems such as wet scrubbers in coal-fired power plants. The CuCl2/gamma-Al2O3 catalyst can be used as a low temperature Hg(0) oxidation catalyst. (C) 2015 Elsevier B.V. All rights reserved.
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