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首页> 外文期刊>Environmental Science & Technology >Tailor-Made Core-Shell CaO/TiO_2-Al_2O_3 Architecture as a High-Capacity and Long-Life CO_2 Sorbent
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Tailor-Made Core-Shell CaO/TiO_2-Al_2O_3 Architecture as a High-Capacity and Long-Life CO_2 Sorbent

机译：量身定制的CaO / TiO_2-Al_2O_3核壳结构，具有高容量和长寿命的CO_2吸附剂

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摘要

CaO-based sorbents are widely used for CO_2 capture, steam methane reforming, and gasification enhancement, but the sorbents suffer from rapid deactivation during successive carbonation/calcination cycles. This research proposes a novel self-assembly template synthesis (SATS) method to prepare a hierarchical structure CaO-based sorbent, Ca-rich, Al_2O_3 supported, and TiO_2-stabilized in a core-shell microarchitecture (CaO/TiO_2-Al_2O_3). The cyclic CO_2 capture performance of CaO/TiO_2-Al_2O_3 is compared with those of pure CaO and CaO/Al_2O_3 CaO/TiO_2-Al_2O_3 sorbent achieved superior and durable CO_2 capture capacity of 0.52 g CO_2/g sorbent after 20 cycles under the mild calcination condition and retained a high-capacity and long-life performance of 0.44 g CO_2/g sorbent after 104 cycles under the severe calcination condition, much higher than those of CaO and CaO/Al_2O_3. The microstructure characterization of CaO/TiO_2- Al_2O_3 confirmed that the core-shell structure of composite support effectively inhibited the reaction between active component (CaO particles) and main support (Al_2O_3 particles) by TiO_2 addition, which contributed to its properties of high reactivity, thermal stability, mechanical strength, and resistance to agglomeration and sintering.
机译：基于CaO的吸附剂被广泛用于CO_2捕集，蒸汽甲烷重整和气化增强，但是在连续的碳化/煅烧循环中，吸附剂会迅速失活。这项研究提出了一种新颖的自组装模板合成（SATS）方法，以制备分层结构的CaO基吸附剂，富Ca，Al_2O_3负载和TiO_2稳定在核壳微体系结构（CaO / TiO_2-Al_2O_3）中。将CaO / TiO_2-Al_2O_3与纯CaO的循环CO_2捕集性能进行了比较，并且CaO / Al_2O_3 CaO / TiO_2-Al_2O_3吸附剂在温和的煅烧条件下经过20个循环后实现了0.52 g CO_2 / g吸附剂的持久耐用CO_2捕集能力。在苛刻的煅烧条件下经过104次循环后，仍具有0.44 g CO_2 / g吸附剂的高容量和长寿命性能，远高于CaO和CaO / Al_2O_3。 CaO / TiO_2-Al_2O_3的微观结构表征证实，复合载体的核-壳结构通过加入TiO_2有效抑制了活性成分（CaO颗粒）与主载体（Al_2O_3颗粒）之间的反应，从而使其具有高反应活性，热稳定性，机械强度以及抗结块和烧结性。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|8237-8245|共9页
  • 作者

    Weiwei Peng; Zuwei Xu; Cong Luo; Haibo Zhao;

  • 作者单位

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China,China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China,China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;

  • 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);美国《化学文摘》(CA);
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