Synergistic effects of multi-walled carbon nanotubes and Mn0.4Cu0.6Fe2O4 on mercury removal with high efficiency and sulfur resistance

IF 5.6 2区工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-10-16 DOI:10.1016/j.joei.2024.101863

Bo Xu , Wan-Yuan Shi , Lin Feng , Wan Sun , Liang-Ming Pan

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Abstract

Although ferrite-based adsorbents are the potential mercury removal materials for the high thermal stability, they usually suffer from a low efficiency in flue gas environment, especially under SO₂ condition. In the present paper, the multi-walled carbon nanotubes (MWCNTs) are utilized to improve the adsorption capacity of the Mn_0.4Cu_0.6Fe₂O₄ adsorbents as well as inhibit the influence of flue gas composition. The influences of temperature, adsorbent type and the flue gas composition on Hg⁰ removal efficiency are evaluated by experiments. The physical adsorption property of MWCNTs provides a platform for Hg⁰ oxidation by Mn_0.4Cu_0.6Fe₂O₄. The synergistic effect between MWCNTs and Mn_0.4Cu_0.6Fe₂O₄ enhances the mercury removal efficiency as well we the sulfur resistance. The results find that the adsorbent of Mn_0.4Cu_0.6Fe₂O₄ containing 14 % MWCNTs has a high mercury removal efficiency of 95.6 % at 120 °C even under 1000 ppm SO₂ concentration. The kinetic behaviors of adsorbent adsorption are analyzed by theoretical models. The mechanisms of porous carbon-containing modifier to improve the mercury removal performance of Mn_0.4Cu_0.6Fe₂O₄ are explored carefully. The present ferrite-based adsorbent exhibits promising prospects for the practical industrial applications of the low temperature mercury removal from coal-fired flue gas.

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多壁碳纳米管和 Mn0.4Cu0.6Fe2O4 在高效脱汞和抗硫方面的协同效应

虽然亚铁基吸附剂具有较高的热稳定性，是一种潜在的脱汞材料，但它们在烟气环境中通常效率较低，尤其是在二氧化硫条件下。本文利用多壁碳纳米管（MWCNTs）来提高 Mn0.4Cu0.6Fe2O4 吸附剂的吸附能力，并抑制烟气成分的影响。实验评估了温度、吸附剂类型和烟气成分对 Hg0 去除效率的影响。MWCNTs 的物理吸附特性为 Mn0.4Cu0.6Fe2O4 氧化 Hg0 提供了一个平台。MWCNTs 与 Mn0.4Cu0.6Fe2O4 的协同效应提高了汞的去除效率和抗硫能力。结果发现，含有 14% MWCNTs 的 Mn0.4Cu0.6Fe2O4 吸附剂在 120 °C、1000 ppm 二氧化硫浓度条件下的汞去除率高达 95.6%。理论模型分析了吸附剂吸附的动力学行为。仔细探讨了多孔碳改性剂改善 Mn0.4Cu0.6Fe2O4 汞去除性能的机理。该铁氧体基吸附剂在燃煤烟气低温脱汞的实际工业应用中具有广阔的前景。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.