Citation: CHI Gui-long, SHEN Bo-xiong, ZHU Shao-wen, HE Chuan. Oxidation of elemental mercury over modified SCR catalysts[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(6): 763-768. shu

Oxidation of elemental mercury over modified SCR catalysts

1.
College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
2.
College of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

Corresponding author: SHEN Bo-xiong, shenboxiong0722@sina.com
Received Date: 12 January 2016
Revised Date: 17 March 2016

Figures(6)

The oxidation activity of elemental mercury (Hg⁰) by transition metal modified SCR catalysts was investigated by using the simulated SCR reactor. The physical and chemical properties of the catalysts were characterized by N₂ adsorption-desorption and X-ray diffraction (XRD). The results show that the specific surface area and total pore volume of the catalysts are decreased after the modification by metal oxide. However, the pore structure and distribution after modification have little variation. The weak diffraction peaks of transition metal oxide can be seen from the XRD pattern. Both 8% Ce/SCR and 8% Cu/SCR catalysts show a relatively stable and high Hg⁰ oxidation efficiency, while the oxidation activity of the 8% Co/SCR catalyst is greatly influenced by temperature. The modified SCR catalysts have an excellent catalytic performance for the Hg⁰ oxidation under a lower concentration of NH₃ and NO. And the Hg⁰ oxidation efficiency is promoted significantly in the presence of HCl. On the contrary, there is little improvement in the Hg⁰ oxidation by HCl at the condition of higher concentration of NH₃ and NO.
- metal modifier,
- SCR catalyst,
- Hg⁰ oxidation
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1.
沈阳化工大学材料科学与工程学院沈阳 110142