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Thermal analysis of sulphur impregnated activated carbons with mercury adsorbed from the vapour phase

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Abstract

Activated carbons (AC), particularly those containing sulphur, are effective adsorbents for mercury (Hg) vapour at elevated temperatures. Activated carbon-based technologies are expected to become a major part of the strategy for controlling mercury emission from coal-fired power plants. Understanding the mechanism of mercury adsorption on sulphur impregnated activated carbons (SIAC) is essential to optimizing activated carbons for better mercury removal efficiency and to developing technologies for the handling of the spent AC.

In this work thermal analysis before and after mercury uptake was carried out for the SIAC prepared under various conditions from oil-sand petroleum coke using a simultaneous differential thermal analyzer. Samples were heated at 20°C min−1 under nitrogen in the temperature range from ambient to 1000°C. The DSC curves suggest both endothermic and exothermic changes during heating. The endothermic processes were attributed to evaporation of moisture and other volatile components. The exothermic processes existed in a wide temperature range of 150–850°C likely due to the oxidation reactions between carbon and adsorbed oxygen, oxygen-containing surface groups. The enthalpies of liquid mercury interaction with SIAC at different Hg/AC mass ratio were also measured at 30, 40 and 50°C using a differential scanning calorimeter. The combination of thermal analysis and calorimetry techniques enabled confirmation that the interaction of mercury with SIAC involves both physical and chemical processes.

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Authors and Affiliations

  1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St, Toronto, ON, M5S 3E5, Canada

    Irina V. Bylina & C. Q. Jia

  2. Department of Chemical Engineering, Wuhan University of Science and Technology, 947 Heping Ave, Qingshan, 430081, Wuhan, Hubei, China

    S. Tong

Authors
  1. Irina V. Bylina
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  2. S. Tong
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  3. C. Q. Jia
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Correspondence to C. Q. Jia.

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Bylina, I.V., Tong, S. & Jia, C.Q. Thermal analysis of sulphur impregnated activated carbons with mercury adsorbed from the vapour phase. J Therm Anal Calorim 96, 91–98 (2009). https://doi.org/10.1007/s10973-008-9879-0

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