Adsorption equilibrium, kinetics and mechanism studies of mercury on coal-fired fly ash

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• 作者：Qiang Zhou ; Yufeng Duan ; Chun Zhu ; Jun Zhang…
• 关键词：Fly Ash ; Mercury ; Adsorption Equilibrium ; Adsorption Kinetics ; Adsorption Mechanism
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：32
• 期：7
• 页码：1405-1413
• 全文大小：490 KB
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• 作者单位：Qiang Zhou (1)
  Yufeng Duan (1)
  Chun Zhu (1)
  Jun Zhang (1)
  Min She (1)
  Hongqi Wei (1)
  Yaguang Hong (1)
  
  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

Fly ash samples were collected from the electrostatic precipitator (ESP) of a 600MW pulverized coal boiler firing Zhungeer bituminous coal in China to evaluate and explore its mercury adsorption capacity and mechanism. Samples characterization was conducted to feature their morphologies correlated to mercury content, and experimental studies on mercury adsorption in a fixed-bed apparatus were carried out to further verify its mercury adsorption availability. Based on the experimental data, adsorption isotherm was modeled with Langmuir, Freundlich, and Temkin equations. Adsorption kinetic analysis was also performed. The results show that mercury content of fly ash samples is associated with particle size, unburned carbon content and functional groups of Al-O/Si-O or Si-O-Si/Si-O-Al tetrahedron on fly ash. Increase of initial mercury concentration is beneficial to promote mercury adsorption due to the enhancement of mercury diffusion force onto the fly ash surface, mercury intraparticle diffusion rate and initial mercury adsorption rate. Fly ash with medium size displays better mercury adsorption capacity. Smaller particle size results in higher specific surface area, but brings about low specific surface area utilization rate for mercury adsorption. Freundlich isotherm equation presents better fitting result, indicating that fly ash surface is non-uniform. Mercury adsorption on fly ash at 120°C is mainly physisorption enhanced by chemisorption with ΔG at ?6.73 kJ/mol. The pseudo-first-order kinetic model can describe the adsorption process more accurately and predict mercury adsorption capacity of fly ash preferably, showing that mercury adsorption on fly ash surface in fixed-bed is controlled dominantly by external mass transfer.