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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Preparation of CaO-based sorbent from coal fly ash cenospheres for calcium looping process
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Preparation of CaO-based sorbent from coal fly ash cenospheres for calcium looping process

机译：煤粉煤型钙煤煤层钙循环工艺制备

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摘要

With the aim to synthesize an inexpensive and high-stable sorbent for CO2 capture processes, an industrial waste-product derived from coal-fired power plant, the so-called coal fly ash (CFA) cenospheres, was employed as inert supporting material. The CaO-based sorbent derived from CFA cenospheres (mainly composed of mullite and quartz) was prepared via a solution-based citric acid method. The obtained slurry was decomposed at 500 degrees C in air for 2 h. From the XRD results the CaO-CFA500 sorbent was mainly composed of Ca12Al14O33 (mayenite) and Ca(OH)(2) along with trace of gamma-Al(OH)(3) and CaCO3 and starting SiO2. A further air-heating at 900 degrees C was conducted because the CO2 sorbent is submitted at high temperature for regeneration. The CaO-CFA900 sorbent was made of free-CaO and two crystalline calcium-alumino-silicate phases, namely gehlenite (Ca2Al2SiO2) and anorthite (CaAl2Si2O8). The optimized mesopore size particles belonging to CaO-CFA900 was reflected in a high stability over multiple cycles of carbonation/calcination. The initial CO2 capture capacity of the sorbent was 0.33 g CO2 g(-1) sorbent, which was about three times the value of pure CaO (0.11 g CO2 g(-1) CaO), and reduced to 0.22 g CO2 g(-1) sorbent after 20 cycles remaining then stable over 200th cycles. From the present results it can be argued that CaL process could be easily scalable by re-using a coal-fired plant waste-product. (C) 2019 Elsevier B.V. All rights reserved.
机译：以目标合成用于CO2捕获处理的廉价而高稳定的吸附剂，从燃煤发电厂衍生的工业废物副产物，即所谓的粉煤灰（CFA）空心微珠，被用作惰性辅助材料。从CFA煤胞衍生的CaO系吸附剂（主要成分的莫来石和石英）通过基于溶液的柠檬酸方法制备。将所得到的浆液在空气中500℃下2小时分解。从X射线衍射结果中的CaO-CFA500吸附剂主要与痕量沿着组成Ca12Al14O33（钙铝石）和Ca（OH）（2）的伽马的Al（OH）（3）和CaCO 3和起始的SiO 2。进一步的空气加热，在900℃下被进行，因为二氧化碳吸附剂在高温下提交再生。中的CaO-CFA900吸附剂制成游离CaO和两种结晶钙 - 铝 - 硅酸盐相，即钙黄长石（Ca2Al2SiO2）和钙长石（CaAl2Si2O8）的。属于的CaO-CFA900优化孔尺寸颗粒反映在经碳酸化/煅烧的多次循环的高稳定性。吸附剂的初始CO 2捕获能力为0.33克CO2克（-1）的吸附剂，其为约纯的CaO三倍的值（0.11克CO 2克（-1）的CaO），并降低至0.22克CO2克（ - 1）吸附剂20次循环后的剩余然后经200次循环中保持稳定。从目前的结果可以认为，加州的过程可能是通过重新使用燃煤电厂废弃物的产品易于扩展。 （c）2019 Elsevier B.v.保留所有权利。

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