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CO_2 adsorption capacity of argonne premium coals

机译：氩气高级煤的CO_2吸附能力

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摘要

Adsorption and desorption isotherms of C02 on dried Argonne Premium coal samples were investigated. A small hysteresis was detected between the adsorption and desorption isotherms. The hysteresis was small or negligible for high rank coals but discernable for low rank coals. The isotherms were found to be rectilinear and to fit the conventional adsorption equations poorly. The rectilinear shape of the adsorption isotherms was related to the solubility of the CO_2 in the coal and to coal swelling. Using an adsorption model that accounted for volumetric effects provided good agreement between the surface areas calculated from the high-pressure isotherms and the literature values obtained under traditional low-pressure conditions. Ignoring the volumetric effects resulted in estimated surface areas that were 40 percent larger for the higher-ranked coals and 60-100 percent larger for the lower-ranked coals. The heat of adsorption, after correcting for volumetric effects, was fairly constant (26 +- 1 kJ/mol) regardless of rank. The adsorption capacity, average pore size, and volume effect for each of the Argonne coals were also estimated employing the same model. The model equation explicitly accounts for volumetric effects, attributable to the solubility of CO_2 in the organic matrix and the coal swelling, and estimates the actual adsorbed amount.
机译：研究了干燥的Argonne Premium煤样品上CO2的吸附和解吸等温线。在吸附和解吸等温线之间检测到小的磁滞。对于高阶煤，磁滞很小或可以忽略不计，而对于低阶煤，磁滞可以识别。发现等温线是直线的，并且与常规吸附方程的拟合很差。吸附等温线的直线形状与CO_2在煤中的溶解度和煤溶胀有关。使用考虑了体积效应的吸附模型，可以根据高压等温线计算出的表面积与在传统低压条件下获得的文献值之间取得很好的一致性。忽略体积效应，得出的表面积估计值对于较高等级的煤来说要大40％，而对于较低等级的煤要大60-100％。校正体积效应后，吸附热是相当恒定的（26 +1 kJ / mol），与等级无关。每种阿贡煤的吸附容量，平均孔径和体积效应也采用相同的模型估算。模型方程式明确考虑了体积效应，归因于CO_2在有机基质中的溶解度和煤溶胀，并估算了实际吸附量。

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  • 来源
    《Fuel》 |2004年第8期|p.1085-1094|共10页
  • 作者

    Ekrem Ozdemir; Badie I. Morsi; Karl Schroeder;

  • 作者单位

    Environmental Science and Technology Division, National Energy Technology Laboratory (NETL), US Department of Energy (DOE), P.O. Box 10940, Pittsburgh, PA 15236-0940, USA;

  • 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 燃料化学工业（总论）;
  • 关键词

    Isotherm; Swelling; Rank;

    机译：等温线;膨胀;等级;

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