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首页> 外文期刊>Fuel >Pure hydrogen from lighter fractions of bio-oil by steam-iron process: Effect of composition of bio-oil, temperature and number of cycles
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Pure hydrogen from lighter fractions of bio-oil by steam-iron process: Effect of composition of bio-oil, temperature and number of cycles

机译：通过蒸汽熨斗工艺从较轻的生物油馏分中获得纯氢：生物油的组成，温度和循环次数的影响

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摘要

High purity hydrogen has been obtained by "steam-iron" process from lighter fractions of synthetic bio-oils of different compositions in a single fixed bed reactor operating cyclically. This process in closely related to chemical looping producing and purifying hydrogen in a single reactor. The feedstock consisted of a blend of four model compounds representing the lighter fractions of a bio-oil. Acetic acid has been chosen as representative of the acidic fraction, hydroxyacetone of the ketonic/aldehydic, methanol of the alcoholic and finally water of the aqueous one. Content of each model compound in the mixture has been fixed by design of experiments techniques according to composition of real bio-oils found in literature. First step involves the reduction of an iron oxide at several temperatures (650-850 degrees C) by the action of a synthetic bio-oil, which catalytically decomposes into gaseous reductive species (mainly hydrogen and carbon monoxide). Solid carbon was also produced and deposited on the surface of the solid. Once the iron oxide is completely reduced, a second step consists in the oxidation of the metallic iron with steam releasing pure hydrogen. Along this reaction, and due to the low oxidation temperature (550 degrees C), carbon deposited in the previous step was not appreciably gasified, letting the released hydrogen be virtually free of carbon monoxide ([ CO] < 20 ppm). Low proportions of water in the reductive gases have proved to exert a positive effect in the process, diminishing the residual carbon deposited on the solid bed, although decreasing reduction rates. The solid tested along this study, based on an iron oxide with small amounts of alumina and ceria, can produce pure hydrogen following a cyclic process, but exhibits a progressive loss of redox capacity of ca. 3 wt% after each cycle. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在单一固定床反应器中，通过“蒸汽-铁”法从不同组成的合成生物油的较轻馏分中获得了高纯度氢，该固定床反应器循环运行。该过程与在单个反应器中产生和纯化氢的化学循环密切相关。原料由代表生物油较轻馏分的四种模型化合物的混合物组成。选择了乙酸作为酸性部分的代表，酮/醛的羟基丙酮，醇的甲醇，最后是含水的水。通过根据文献中发现的真实生物油的组成，通过实验技术的设计来固定混合物中每种模型化合物的含量。第一步涉及通过合成生物油的作用，在几个温度（650-850摄氏度）下还原氧化铁，该生物油催化分解为气态还原性物质（主要是氢和一氧化碳）。固体碳也被产生并沉积在固体表面上。一旦氧化铁被完全还原，第二步包括用蒸汽将金属铁氧化以释放出纯氢。在该反应过程中，由于氧化温度较低（550摄氏度），在先前步骤中沉积的碳并未明显气化，从而使释放出的氢气几乎不含一氧化碳（[CO] <20 ppm）。还原性气体中低比例的水已证明在该过程中发挥了积极作用，尽管降低了还原率，但减少了沉积在固体床上的残留碳。沿着这项研究测试的固体，是基于具有少量氧化铝和二氧化铈的氧化铁，可以在循环过程中产生纯氢，但是氧化还原能力逐渐下降，约为。每个循环后3wt％。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第1期|452-459|共8页
  • 作者

    Plou J.; Lachen J.; Duran P.; Herguido J.; Pena J. A.;

  • 作者单位

    Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor 3,Ed I D, Zaragoza 50018, Spain;

    Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor 3,Ed I D, Zaragoza 50018, Spain;

    Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor 3,Ed I D, Zaragoza 50018, Spain;

    Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor 3,Ed I D, Zaragoza 50018, Spain;

    Univ Zaragoza, Aragon Inst Engn Res I3A, Catalysis Mol Separat & Reactor Engn Grp CREG, Mariano Esquillor 3,Ed I D, Zaragoza 50018, Spain;

  • 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

    Hydrogen; Steam-iron; Oxygen carrier; Iron oxide; Bio-oil; Chemical looping;

    机译：氢;蒸汽铁;氧载体;氧化铁;生物油;化学循环;

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