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首页> 外文期刊>Fuel >Magnesium-based basic mixtures derived from earth-abundant natural minerals for CO_2 capture in simulated flue gas
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Magnesium-based basic mixtures derived from earth-abundant natural minerals for CO_2 capture in simulated flue gas

机译：富含地球天然矿物的镁基碱性混合物，用于在模拟烟道气中捕获CO_2

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摘要

Magnesium-based adsorbents with high theoretical CO2 uptakes, moderate regeneration energy, and good cyclic working stability show promise for intermediate-temperature CO2 capture from flue gas stream. Identification of low-cost materials for fabricating highly efficient magnesium-based adsorbents is one significant challenge for their large-scale applications. In this work, magnesium-based basic mixtures derived from earth-abundant natural minerals were employed as CO2 adsorbents. CO2 sorption performance of the adsorbents was evaluated using a fixed-bed reactor. Several kinetic equations were adopted to describe their CO2 sorption kinetic behaviors. Results show that the BM-HM and BM-BR adsorbents calcined from hydromagnesite and brucite possess attractive CO2 uptakes (1.73 and 1.67 mmol CO2/g) at 200 degrees C. The Avrami fractional kinetic model is expected to accurately predict the equilibrium CO2 uptakes, and the adsorbents show relatively fast CO2 sorption rate. The desired adsorbents exhibit favorable working stability with low loss-in-capacity of 5.65% and 5.33% over 10 repeated cycles. Characterization analyses indicates that the adsorbents own great physicochemical parameters, which will facilitate the diffusion and adsorption of gaseous reactants. Moreover, the dispersion of the basic mixtures in flake and sheet-like geometry can benefit the adsorbents reduced internal diffusion resistance and enhanced MgO utilization efficiency. These are associated with their excellent CO2 sorption performance. The scheme provides significant environmental implications as it will provide an attractive route towards cost-effective CO2 abatement and waste management.
机译：具有高理论CO 2吸收量，适度的再生能量和良好的循环工作稳定性的镁基吸附剂有望从烟气流中捕获中等温度的CO 2。鉴定用于制造高效镁基吸附剂的低成本材料是其大规模应用的一项重大挑战。在这项工作中，源自地球上丰富的天然矿物的镁基碱性混合物被用作CO2吸附剂。使用固定床反应器评估了吸附剂对CO2的吸附性能。采用了几个动力学方程式来描述它们的CO2吸附动力学行为。结果表明，从菱镁矿和水镁石煅烧的BM-HM和BM-BR吸附剂在200摄氏度下具有有吸引力的CO2吸收（1.73和1.67 mmol CO2 / g）。Avrami分数动力学模型有望准确预测平衡的CO2吸收，吸附剂表现出相对较快的CO2吸附速率。所需的吸附剂在10个重复循环中表现出良好的工作稳定性，以及低的5.65％和5.33％的容量损失。表征分析表明，吸附剂具有很大的理化参数，这将促进气态反应物的扩散和吸附。而且，基本混合物以薄片状和片状几何形状的分散可以使吸附剂降低内部扩散阻力并提高MgO的利用效率。它们具有出色的CO2吸附性能。该计划将对环境产生重大影响，因为它将为实现经济高效的二氧化碳减排和废物管理提供有吸引力的途径。

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  • 来源
    《Fuel》 |2019年第1期|298-305|共8页
  • 作者

    Guo Yafei; Tan Chang; Wang Peng; Sun Jian; Li Weiling; Zhao Chuanwen; Lu Ping;

  • 作者单位

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

    Nanjing Normal Univ, Sch Energy & Mech Engn, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210042, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium mineral precursor; Magnesium-based adsorbent; CO2 sorption capacity; CO2 sorption kinetic performance; Cyclic working stability;

    机译：镁矿物前体镁基吸附剂CO2吸附能力CO2吸附动力学性能循环工作稳定性;

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