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首页> 外文期刊>Energy & fuels >Potassium Catalytic Effect on Gasification Reactions of Coal and Coal/Biomass Blends under Oxy-combustion Conditions. An Isotopic Study Using ~(13)C~(18)O_2
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Potassium Catalytic Effect on Gasification Reactions of Coal and Coal/Biomass Blends under Oxy-combustion Conditions. An Isotopic Study Using ~(13)C~(18)O_2

机译：氧燃烧条件下钾对煤及煤/生物质混合物气化反应的催化作用〜（13）C〜（18）O_2的同位素研究

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摘要

In the present study, 20 wt % K2CO3 was added to coal and coal/biomass blends in a 20:80 wt % ratio and subsequently were heating-treated at 600 degrees C using CO2 or N-2 atmospheres. The reactivity under oxy-combustion conditions (21% O-2 + 79% CO2) was studied by thermogravimetry, and characterization of chars was carried out by N-2 adsorption, scanning electron microscopy, and Raman and X-ray photoelectron spectroscopy. Higher activation energy for impregnated coal/biomass blends compared to impregnated coal was observed, likewise, for materials thermally treated with CO2. It is demonstrated that CO2 gasification takes place together with O-2 combustion under oxy-combustion conditions. Isotopically labeled (CO2)-C-13-O-18 was used to confirm the participation of CO2 gasification reactions at 450, 500, 550, and 600 degrees C in both catalyzed and uncatalyzed systems under O-2 + CO2. The catalytic effect of potassium promotes CO2 gasification, and the highest CO ((CO)-C-12-O-18) desorption was obtained with impregnated samples. It is possible to suggest that CO2 gasification reactions follow different reaction pathways in the presence or absence of potassium. The catalytic gasification reaction proceeded preferentially through a molecular CO2 ((CO2)-C-13-O-18) adsorption route, while the noncatalyzed systems advanced using a dissociative adsorption pathway.
机译：在本研究中，将20 wt％的K2CO3以20:80 wt％的比例添加到煤和煤/生物质混合物中，随后在600摄氏度下使用CO2或N-2气氛进行热处理。通过热重法研究了在氧燃烧条件下（21％O-2 + 79％CO2）的反应性，并通过N-2吸附，扫描电子显微镜以及拉曼和X射线光电子能谱对炭进行了表征。对于浸渍过的煤/生物质混合物，与浸渍过的煤相比，活化能更高。结果表明，在氧气燃烧条件下，CO2气化与O-2燃烧一起发生。同位素标记的（CO2）-C-13-O-18用于确认在O-2 + CO2下催化和未催化系统中450、500、550和600摄氏度下CO2气化反应的参与。钾的催化作用促进了CO2的气化，并且浸渍样品获得了最高的CO（（CO）-C-12-O-18）解吸。可能暗示在有或没有钾的情况下，CO2气化反应遵循不同的反应路径。催化气化反应优先通过分子CO2（（CO2）-C-13-O-18）吸附途径进行，而非催化系统则采用解离吸附途径进行反应。

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  • 来源
    《Energy & fuels》 |2018年第2期|2439-2449|共11页
  • 作者

    Betancur Yuli; Sanchez Astrid; Bueno-Lopez Agustin; Lopez Diana;

  • 作者单位

    Univ Antioquia, UdeA Colombia, Quim Recursos Energet & Medio Ambiente, Inst Quim,Fac Ciencias Exactas & Nat, Calle 70 52-21, Medellin, Colombia;

    Univ Nacl Colombia, Sede Medellin, Escuela Quim, Calle 59A 63-20, Medellin, Colombia;

    Univ Alicante, Dept Quim Inorgan, Carretera San Vicente S-N, E-03080 Alicante, Spain;

    Univ Antioquia, UdeA Colombia, Quim Recursos Energet & Medio Ambiente, Inst Quim,Fac Ciencias Exactas & Nat, Calle 70 52-21, Medellin, Colombia;

  • 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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