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首页> 外文期刊>Fuel >CO_2 splitting by thermo-chemical looping based on Zr_xCe_(1-x)O_2 oxygen carriers for synthetic fuel generation
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CO_2 splitting by thermo-chemical looping based on Zr_xCe_(1-x)O_2 oxygen carriers for synthetic fuel generation

机译：基于Zr_xCe_（1-x）O_2氧载体的热化学循环法裂解CO_2用于合成燃料的生产

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摘要

The thermochemical CO_2 splitting via cerium-based mixed oxides is considered. This process targets the recycling and upgrading of CO_2 emissions for the production of solar fuels. The CO_2 reduction is achieved by thermochemical looping using ceria-zirconia solid solutions as oxygen carriers: (1) the mixed oxide is first reduced by thermal activation for releasing some oxygen from its lattice, (2) the reduced oxide is then oxidized with CO_2 for producing carbon monoxide and the initial metal oxide that is recycled to the first step. Reactive cerium-based mixed oxides were first synthesized as nanopowders by different soft chemical routes. Their reactivity was then investigated experimentally by thermogravimetry analysis to demonstrate that the produced nanoparticles react efficiently with CO_2. The two-step process consisting of thermal activation and CO_2-splitting reaction was able to produce CO repeatedly. The influence of the synthesis method, the Zr content in Zr_xCe_(1-x)O_2, and the temperature of the CO_2 reduction reaction was investigated. The material was reduced at 1400℃ in flowing Ar and the CO_2 reduction was performed below this temperature (typically in the range of 700-1200℃). Both the CO production and the material cyclability were improved when decreasing the Zr content, although the reduction extent was lessened. The Ce_(0.75)Zr_(0.25)O_2 and Ce_(0.9)Zr_(0.1)O_2 redox catalysts withstood repeated cycles without any noticeable sintering and reactivity losses. The most reactive material was the powder synthesized via the Pechini method (242 μmol CO/g at 1000℃).
机译：考虑通过铈基混合氧化物的热化学CO_2分解。此过程的目标是回收和提高用于生产太阳能的CO_2排放量。通过使用二氧化铈-氧化锆固溶体作为氧气载体的热化学循环来实现CO_2的还原：（1）首先通过热活化还原混合氧化物以从其晶格中释放一些氧气，（2）然后将还原后的氧化物用CO_2氧化以得到生产一氧化碳和初始金属氧化物，将其再循环到第一步。活性铈基混合氧化物首先通过不同的软化学路线合成为纳米粉。然后通过热重分析对它们的反应性进行实验研究，以证明所产生的纳米颗粒与CO_2有效反应。由热活化和CO_2分解反应组成的两步​​法能够反复产生CO。研究了合成方法，Zr_xCe_（1-x）O_2中Zr含量以及CO_2还原反应温度的影响。在1400℃的氩气中还原该材料，并在此温度以下（通常在700-1200℃范围内）进行CO_2还原。降低Zr含量时，虽然减少程度减少，但CO的产生和材料的可循环性均得到改善。 Ce_（0.75）Zr_（0.25）O_2和Ce_（0.9）Zr_（0.1）O_2氧化还原催化剂经受了重复的循环，而没有任何明显的烧结和反应性损失。活性最高的材料是通过Pechini方法合成的粉末（在1000℃时为242μmolCO / g）。

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  • 来源
    《Fuel》 |2012年第2012期|p.180-186|共7页
  • 作者

    Stephane Abanades; Alex Le Gal;

  • 作者单位

    Processes, Materials, and Solar Energy Laboratory, CNRS-PROMES, 7 Rue du Four Solaire, 66720 Font-Romeu, France;

    Processes, Materials, and Solar Energy Laboratory, CNRS-PROMES, 7 Rue du Four Solaire, 66720 Font-Romeu, France;

  • 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

    carbon dioxide; valorization; solar fuel; thermochemical; mixed oxide;

    机译：二氧化碳;物价稳定措施;太阳能热化学混合氧化物;

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