One-Pot Hydrothermal Synthesis for a Manganese Oxide Molecular Sieve for Application in Mercury Removal in Chloride-Free Flue Gas

作者：Han, Jun; Shan, Weiwei; Zhao, Bo^*; Tian, Chong; Ma, Junwei; Zhang, Qiang; Qin, Linbo^*; Chen, Wangsheng

来源：ChemistrySelect, 2022, 7(12): e202200246.

DOI：10.1002/slct.202200246

• Elemental mercury
• Hydrothermal synthesis
• Chloride free flue gas
• Catalytic oxidation

OMS-2 (manganese oxide octahedral molecular sieve) were prepared by one pot hydrothermal method under different temperatures in this work, and their performances of oxidizing elemental mercury (Hg-0) in the flue gas derived from coal combustion were evaluated. Moreover, the effects of the reaction temperature and flue gas component on Hg-0 oxidation ability of these catalysts were also investigated. It is found that OMS-2 catalysts have an excellent mercury oxidizing ability under 100-200 degrees C, and 94 % Hg-0 oxidation efficiency could be achieved by catalyst prepared under 120 degrees C (OMS-2-H120) in the chlorine free flue gas. The process of elemental mercury oxidation over OMS-2-H120 by O-2 is found to follow Mars-Maessen mechanism based on the XPS and FTIR analysis of the fresh and spent catalysts. NO is the precursors of the active species such as NO-, NO2, which is benefit to improve Hg-0 oxidation ability of OMS-2-H120. SO2 have a negative effect on Hg-0 oxidation over OMS-2-H120 while water vapor exhibits nearly no influence.

• 单位
  武汉大学