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首页> 外文期刊>Energy & fuels >CO2 and H2S Removal from CH4-Rich Streams by Adsorption on Activated Carbons Modified with K2CO3, NaOH, or Fe2O3
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CO2 and H2S Removal from CH4-Rich Streams by Adsorption on Activated Carbons Modified with K2CO3, NaOH, or Fe2O3

机译：通过吸附在用K2CO3，NaOH或Fe2O3改性的活性炭上，从富含CH4的物流中去除CO2和H2S

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摘要

In this study, the adsorption of CO2 and H2S has been investigated on commercial activated carbon Desorex K43 impregnated with K2CO3, NaOH, or Fe2O3 in order to assess their potential for "upgrading" and desulfurization of biogas or contaminated natural gas. Different chemical [Fourier transformed infrared spectra (FTIR), X-ray fluorescence (XRF) and pH measurements] and textural characterization techniques (N-2 adsorption/desorption isotherms) were used to study the material surface and confirm the presence of K, Na, and Fe. Gravimetric experiments of single and binary gas sorption isotherms were used to evaluate CO2 uptake and selectivity with respect to CH4. Breakthrough curves under dry and humid conditions were performed to assess the adsorption of H2S. The materials studied showed high adsorption capacities for both gases: in the range from 0.85 to 4.58 mmol g(-1) for H2S and from 1.61 to 1.88 mmol g(-1) CO2, under dry conditions and 1 bar. Furthermore, the selectivity of the activated carbons for CO2 in relation to CH4 was in the range of 1.2-2.4, Desorex K43-BG being the material with higher adsorption capacity for gases under study. The data obtained by the adsorption experiments were correlated with the textural characteristics and the chemical properties of the materials, which allowed one to identify how promising an adsorbent is for the removal of acidic gases from biogas to obtain biomethane. The best compromise between H2S adsorption and CO2/CH4 selectivity was found for the sample containing Na (Desorex K43-Na), which benefited from both a basic surface chemistry and pore size distribution restricted to the micropore range.
机译：在这项研究中，已经研究了在用K2CO3，NaOH或Fe2O3浸渍的商业活性炭Desorex K43上对CO2和H2S的吸附，以评估它们对沼气或受污染天然气的“升级”和脱硫的潜力。使用不同的化学物质[傅立叶变换红外光谱（FTIR），X射线荧光（XRF）和pH测量]和结构表征技术（N-2吸附/解吸等温线）研究材料表面并确定K，Na的存在和铁。使用单一和二元气体吸附等温线的重量实验来评估CO2的吸收和相对于CH4的选择性。进行了在干燥和潮湿条件下的穿透曲线，以评估H2S的吸附。所研究的材料显示出对两种气体的高吸附能力：在干燥条件和1 bar下，对H2S的吸附量为0.85至4.58 mmol g（-1），对CO2的吸附量为1.61至1.88 mmol g（-1）。此外，相对于CH4，活性炭对CO2的选择性为1.2-2.4，Desorex K43-BG是对所研究气体具有更高吸附能力的材料。通过吸附实验获得的数据与材料的质地特性和化学性质相关，这使人们能够确定吸附剂从沼气中去除酸性气体以获得生物甲烷的前景如何。对于含Na的样品（Desorex K43-Na），发现H2S吸附和CO2 / CH4选择性之间的最佳折衷，这得益于基本的表面化学性质和限制在微孔范围内的孔径分布。

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  • 来源
    《Energy & fuels》 |2016年第11期|9596-9604|共9页
  • 作者

    Castrillon Melina C.; Moura Karine O.; Alves Caiua A.; Bastos-Neto Moises; Azevedo Diana C. S.; Hofmann Jorg; Mollmer Jens; Einicke Wolf-Dietrich; Glaser Roger;

  • 作者单位

    Univ Fed Ceara, GPSA, Dept Engn Quim, Campus Pici,Bl 731, BR-60455760 Fortaleza, CE, Brazil;

    Univ Fed Ceara, GPSA, Dept Engn Quim, Campus Pici,Bl 731, BR-60455760 Fortaleza, CE, Brazil;

    Univ Fed Ceara, GPSA, Dept Engn Quim, Campus Pici,Bl 731, BR-60455760 Fortaleza, CE, Brazil;

    Univ Fed Ceara, GPSA, Dept Engn Quim, Campus Pici,Bl 731, BR-60455760 Fortaleza, CE, Brazil;

    Univ Fed Ceara, GPSA, Dept Engn Quim, Campus Pici,Bl 731, BR-60455760 Fortaleza, CE, Brazil;

    Inst Nichtklass Chem eV INC, Permoserstr 15, D-04318 Leipzig, Germany;

    Inst Nichtklass Chem eV INC, Permoserstr 15, D-04318 Leipzig, Germany;

    Univ Leipzig, Inst Chem Technol, Linnestr 3, D-04103 Leipzig, Germany;

    Inst Nichtklass Chem eV INC, Permoserstr 15, D-04318 Leipzig, Germany|Univ Leipzig, Inst Chem Technol, Linnestr 3, D-04103 Leipzig, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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