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Effect of gas phase alkali species on tar reforming catalyst performance: Initial characterization and method development

机译：气相碱类物质对焦油重整催化剂性能的影响：初步表征和方法开发

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摘要

In thermochemical conversion of biomass to synthesis gas and biofuels, the effect of varying gas phase alkali concentrations on tar reforming catalyst performance in combination with gas phase sulfur and chlorine is largely unknown. The current study demonstrates a new methodology for investigating gas phase alkali adsorption and presents results for early stage adsorption on a Ni-based catalyst under realistic industrial conditions. The experiments were carried out using pine pellets as feedstock in a setup consisting of a 5 kW atmospheric bubbling fluidized bed gasifier, a high temperature hot gas filter and a catalytic reactor - all operating at 850 degrees C. A potassium chloride solution was atomized with an aerosol generator, and the produced submicrometer KCl particles were continuously introduced to the catalytic reactor where they rapidly evaporated to form KCl (g). The accurate dosing of gas-phase alkali was combined with elimination of transient effects in catalytic performance due to catalyst sintering and S adsorption, and results for K uptake in relation to sulfur uptake were obtained. Different KCl levels in the gas phase demonstrates different initial uptake of K on the catalyst surface, which at low K coverage (theta(K)) is approximately linearly proportional to time on stream. The results also show a clear suppressing effect of sulfur adsorption on potassium uptake. Indications of a slow approach to K equilibration on the catalyst were observed. The potential of the developed methodology for detailed studies under close to industrial conditions is discussed. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在将生物质热化学转化为合成气和生物燃料中，改变气相碱浓度对焦油重整催化剂性能以及气相硫和氯的影响是未知的。当前的研究表明了一种用于研究气相碱吸附的新方法，并提出了在现实的工业条件下在镍基催化剂上进行早期吸附的结果。实验是使用松散颗粒作为原料，在由5 kW大气鼓泡流化床气化炉，高温热气过滤器和催化反应器组成的装置中进行的，这些装置均在850℃下运行。气溶胶发生器，并将产生的亚微米级KCl颗粒连续引入催化反应器中，并在其中迅速蒸发形成KCl（g）。气相碱金属的准确计量与消除由于催化剂烧结和S吸附引起的催化性能瞬变效应相结合，得出了K吸收与硫吸收相关的结果。气相中不同的KCl含量表明催化剂表面上的K初始吸收不同，在低K覆盖率（theta（K））时，其与投产时间大致成线性比例。结果还显示出明显的抑制硫吸附对钾吸收的作用。观察到催化剂上钾平衡缓慢的迹象。讨论了开发的方法在接近工业条件下进行详细研究的潜力。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2015年第15期|95-106|共12页
  • 作者

    Moud Pouya H.; Andersson Klas J.; Lanza Roberto; Pettersson Jan B. C.; Engvall Klas;

  • 作者单位

    KTH Royal Inst Technol, Dept Chem Engn & Technol, SE-10044 Stockholm, Sweden;

    Haldor Topsoe Res Labs, DK-2800 Lyngby, Denmark;

    KTH Royal Inst Technol, Dept Chem Engn & Technol, SE-10044 Stockholm, Sweden;

    Univ Gothenburg, Dept Chem & Mol Biol, Atmospher Sci, SE-41296 Gothenburg, Sweden;

    KTH Royal Inst Technol, Dept Chem Engn & Technol, SE-10044 Stockholm, Sweden;

  • 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

    Tar reforming; Ni catalyst; Biomass gasification; Alkali; Sulfur; Potassium;

    机译：焦油重整Ni催化剂生物质气化碱硫钾;

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