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High efficiency of Mn–Ce‐modified TiO 2 catalysts for the low‐temperature oxidation of Hg 0 under a reducing atmosphere
Author(s) -
Zhang Yingjie,
Ning Ping,
Wang Xueqian,
Wang Langlang,
Ma Yixing,
Ma Qiang,
Xie Yibing
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4866
Subject(s) - chemistry , x ray photoelectron spectroscopy , catalysis , cerium , inorganic chemistry , manganese , adsorption , catalytic oxidation , mercury (programming language) , oxide , scanning electron microscope , cerium oxide , analytical chemistry (journal) , nuclear chemistry , chemical engineering , physics , organic chemistry , biochemistry , chromatography , quantum mechanics , computer science , engineering , programming language
Manganese‐ and cerium oxide‐modified titania catalysts were prepared by the deposition precipitation for the removal of elemental mercury (Hg 0 ) from simulated yellow phosphorus off‐gas at low temperature. In addition, these catalysts were characterized by X‐ray diffraction, Brunauer–Emmett–Teller measurements, X‐ray photoelectron spectroscopy and field‐emission scanning electron microscope to determine the surface morphology of the obtained compounds and explore their formation mechanism. The results revealed that a Mn–Ce loading and reaction temperature of 10% and 150 °C, respectively, as well as a Mn/Ce molar ratio of 2:1, led to an optimal efficiency for the oxidation of elemental mercury. Furthermore, the effects of flue gas components were investigated. The presence of O 2 clearly promoted the oxidation of Hg 0 . A CO atmosphere did not affect the Hg 0 oxidation, when compared with N 2 , whereas the presence of H 2 S and water vapor inhibited the oxidation process. Furthermore, the X‐ray photoelectron spectroscopy spectra of Hg 4f revealed that the elemental mercury adsorbed by the catalyst is present as HgO. Finally, the Hg 0 catalytic oxidation mechanism was discussed on the basis of the experimental results and characterization analysis.