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首页> 外文期刊>Energy Conversion & Management >Enhancement of reactivity in Li_4SiO_4-based sorbents from the nano-sized rice husk ash for high-temperature CO_2 capture
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Enhancement of reactivity in Li_4SiO_4-based sorbents from the nano-sized rice husk ash for high-temperature CO_2 capture

机译：纳米稻壳灰中Li_4SiO_4基吸附剂的活性提高，用于高温CO_2捕集

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摘要

Using the cost-effective, renewable and nano-sized of citric acid pretreatment rice husk ash (CRHA) as silicon source, high efficient Li_4SiO_4 (lithium orthosilicate)-based sorbents (CRHA-Li_4SiO_4) for high-temperature CO_2 capture were prepared through the solid-state reaction at lower temperature (700 ℃). Two typical raw materials (nano-structured Aerosil and crystalline Quartz powders) were used to synthesize Li_4SiO_4 sorbents (Aerosil-Li_4SiO_4 and Quartz-Li_4SiO_4) for comparison purposes. The phase composition behavior, surface area, and morphology of the silicon sources, heat treated raw materials and as-received Li_4SiO_4 sorbents were studied by analytical techniques. The CO_2 adsorption capacity and adsorption-desorption performance were tested by the ther mo-gravimetric analyses (CO_2 atmosphere) and a fixed bed reactor, respectively. Compared with the case of its original samples, the morphology of heat treated raw materials had a greater effect on the phase composition, microstructure, special surface area and CO_2 adsorption properties of their resulting sorbents. Although the calcined Quartz sample maintained the structure of micron particles, its reactivity was not enough to react completely with Li_2CO_3. Due to the greater reactivity of nanoparticles, Aerosil-Li_4SiO_4 presented pure of Li_4SiO_4 whereas it obtained large particles with dense morphology, which was coming from the pronounced fusing of silica nanoparticles during the calcined process. Conversely, CRHA-Li_4SiO_4 achieved porous agglomerates of submicron particles resulting from a high anti-sintering character of its calcined CRHA. This more favorable structure of CRHA-Li_4SiO_4 could lead to the higher CO_2 adsorption capacity of 30.5 wt% (6.92 mmol/g Li_4SiO_4, corresponding to 83.1% efficiency), faster kinetic behavior and better regenerability (its adsorption capacity only decreased 2.1 wt% from the first cycle to the 15th cycle), which was illustrated by the thermogravi-metric analyses and fix bed results.
机译：以经济高效，可再生且纳米级的柠檬酸预处理稻壳灰（CRHA）作为硅源，通过热解法制备了高效的Li_4SiO_4（原硅酸锂）基吸附剂（CRHA-Li_4SiO_4）。在较低温度（700℃）下发生固态反应。为了比较目的，使用两种典型的原材料（纳米结构的Aerosil和晶体石英粉）合成Li_4SiO_4吸附剂（Aerosil-Li_4SiO_4和Quartz-Li_4SiO_4）。通过分析技术研究了硅源，热处理原料和原样的Li_4SiO_4吸附剂的相组成行为，表面积和形态。通过热重分析（CO_2气氛）和固定床反应器分别测试了CO_2的吸附能力和吸附-脱附性能。与原始样品相比，热处理过的原料的形态对所形成的吸附剂的相组成，微观结构，比表面积和CO_2吸附性能的影响更大。尽管煅烧的石英样品保持了微米颗粒的结构，但其反应性不足以与Li_2CO_3完全反应。由于纳米颗粒具有更高的反应性，Aerosil-Li_4SiO_4表现出纯的Li_4SiO_4，而它却获得了具有致密形态的大颗粒，这是由于煅烧过程中二氧化硅纳米颗粒的明显熔合所致。相反，CRHA-Li_4SiO_4通过煅烧后的CRHA的高抗烧结特性获得了亚微米颗粒的多孔团聚体。 CRHA-Li_4SiO_4的这种更有利的结构可导致更高的CO_2吸附能力，达到30.5 wt％（6.92 mmol / g Li_4SiO_4，相当于效率83.1％），更快的动力学行为和更好的可再生性（其吸附能力仅比上一年降低2.1 wt％）。第一个循环到第15个循环），通过热重分析和固定床结果进行了说明。

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  • 来源
    《Energy Conversion & Management》 |2014年第5期|447-454|共8页
  • 作者

    Ke Wang; Pengfei Zhao; Xin Guo; Yimin Li; Dongtai Han; Yang Chao;

  • 作者单位

    School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

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

    School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

    School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, China;

  • 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

    CO_2; Rice husk ash; Sorption/desorption; Li_4SiO_4;

    机译：CO_2;稻壳灰;吸附/解吸;Li_4SiO_4;

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