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首页> 外文期刊>Aerosol and Air Quality Research >Preparation of Fe2O3/Al2O3 and Fe2O3/TiO2 Pellets as Oxygen Carrier for Chemical Looping Process
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Preparation of Fe2O3/Al2O3 and Fe2O3/TiO2 Pellets as Oxygen Carrier for Chemical Looping Process

机译：Fe2O3 / Al2O3和Fe2O3 / TiO2颗粒作为氧气的化学环流载体的制备

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Fe-based oxygen carriers supported by Al2O3 and TiO2 were prepared as pellets for chemical looping combustion in this study. Over 90% conversions were obtained for most experiments operated in the TGA; however, experiments conducted with FeTi320 pellets exhibited higher conversions than those with FeAl320. The prepared pellets sintered at higher temperatures always exhibited higher crush strength. The crush strength of prepared FeAl320 and FeTi320 pellets were decreased for experiments conducted with greater starch content, because the more pore spaces are formed in the original places of the starch grains. For experiments conducted in the fixed bed reactor, the prepared pellets exhibited relatively high conversion. The conversions of FeTi320 were remained to be about 80% with increasing starch content because high porosity (approximately 50%) was formed for 0–20% starch contents of FeTi320 pellets after 10 redox cycles. Less porosity was formed after 20 redox cycles for experiments conducted with FeAl320 pellets prepared with higher starch contents. Therefore, the conversion of FeAl320 pellets was elevated with increasing starch content. Iron content for inner part of prepared pellets was significantly decreased after operated for 20 redox cycles, while iron content for outer part of pellets were increased. It is suggested that the iron ions may diffuse onto the surface of oxygen carriers to react with oxygen during the oxidation period.
机译：本研究以Al2O3和TiO2为载体的铁基氧载体制备为颗粒，用于化学循环燃烧。对于大多数在TGA中进行的实验，转化率均超过90％;但是，用FeTi320球团进行的实验显示出比用FeAl320更高的转化率。在较高温度下烧结的制备的粒料总是表现出较高的抗碎强度。对于淀粉含量较高的实验，制备的FeAl320和FeTi320颗粒的抗碎强度会降低，因为在淀粉颗粒的原始位置会形成更多的孔隙。对于在固定床反应器中进行的实验，所制备的粒料表现出较高的转化率。 FeTi320的转化率随淀粉含量的增加而保持在80％左右，因为在10个氧化还原循环后，FeTi320颗粒的0-20％淀粉含量高，形成了高孔隙率（约50％）。对于用较高淀粉含量制备的FeAl320颗粒进行的实验，在20个氧化还原循环后形成的孔隙率降低。因此，FeAl320颗粒的转化率随淀粉含量的增加而提高。进行20次氧化还原循环后，制得的颗粒内部的铁含量显着降低，而颗粒外部的铁含量则增加。建议在氧化期间铁离子可以扩散到氧载体的表面上，与氧反应。

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