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Characterization of coal before and after supercritical CO_2 exposure via feature relocation using field-emission scanning electron microscopy

机译：使用场发射扫描电子显微镜通过特征重定位来表征超临界CO_2暴露前后的煤特征

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摘要

The solvent and swelling effects of supercritical CO_2 on coal structure and porosity were examined using high-resolution field-emission scanning electron microscopy (FE-SEM) and surface area techniques to investigate any irreversible CO_2 induced alterations of the micro-, meso-, and macropores. Dry, 1 in. unconfined cores of Pittsburgh and Sewickly bituminous coals were exposed to supercritical CO_2 at 15.3 MPa (2200 psig) and 328 K (55 ℃) for 104 days. Prior to CO_2 exposure, coal structure and porosity - specifically macropores (>50 nm) - were imaged using FE-SEM. After CO_2 exposure, the imaged features were relocated, reimaged, and analyzed for structural changes. Brunauer-Emmett-Teller (BET) surface areas were evaluated from the adsorption isotherms of N_2 at 77 K and P/Po = 0.1-0.3. Micropore surface areas were determined from the low-pressure adsorption isotherms of CO_2 at 293 K using the Dubinin-Polanyi equation. FE-SEM analysis indicated that there were no significant changes observed in the pore areas in all coal samples after CO_2 exposure. Meso- and micropore characteristics were slightly affected by supercritical CO_2 exposure.
机译：使用高分辨率场发射扫描电子显微镜（FE-SEM）和表面积技术研究了超临界CO_2对煤结构和孔隙度的溶剂和溶胀作用，以研究任何不可逆的CO_2引起的微观，中观和微观变化。大孔。匹兹堡和Sewickly烟煤的干燥1英寸无侧限岩心在15.3 MPa（2200 psig）和328 K（55℃）的超临界CO_2中暴露104天。在暴露于CO_2之前，使用FE-SEM对煤的结构和孔隙率-特别是大孔（> 50 nm）进行了成像。在CO_2曝光后，将成像的特征重新定位，重新成像并分析结构变化。由N_2在77 K和P / Po = 0.1-0.3时的吸附等温线评估Brunauer-Emmett-Teller（BET）表面积。使用Dubinin-Polanyi方程由293 K下CO_2的低压吸附等温线确定微孔表面积。 FE-SEM分析表明，CO_2暴露后，所有煤样品的孔隙面积均未见明显变化。超临界CO_2暴露对中孔和微孔特征有轻微影响。

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  • 来源
    《Fuel》 |2013年第5期|777-786|共10页
  • 作者

    Barbara G. Kutchko; Angela L Goodman; Eilis Rosenbaum; Sittichai Natesakhawat; Keith Wagner;

  • 作者单位

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh, PA 15236, United States;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh, PA 15236, United States;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh, PA 15236, United States;

    National Energy Technology Laboratory, United States Department of Energy, P.O. Box 10940, Pittsburgh, PA 15236, United States,Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15260, United States;

    RJ Lee Croup, Inc., Monroeville, PA 15146, United States;

  • 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

    coal structure; carbon sequestration; scanning electron microscopy; storage; macrospheres;

    机译：煤结构碳汇;扫描电子显微镜;存储;宏球;

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