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Investigation of CuO–Fe2O3 Oxygen Carriers with Different Supports in Chemical Looping Combustion
Energy & Fuels ( IF 5.3 ) Pub Date : 2021-01-21 , DOI: 10.1021/acs.energyfuels.0c03694
Shouxi Jiang 1 , Laihong Shen 2 , Jingchun Yan 2 , Xin Niu 3 , Bin Hu 1
Affiliation  

In this study, Cu–Fe bimetallic oxygen carriers (OCs) were prepared by the impregnation method based on SiO2, Al2O3, or hematite supports and the characteristics of manufactured OCs were investigated in a fluidized-bed reactor. The X-ray diffraction studies showed that Cu in OCs existed in the form of CuFe2O4. During cyclic operations, using CO gas as a fuel, Cu–Fe OCs with hematite (CuFe–He) or Al2O3 (CuFe–Al) as a support performed better and the reactivity of the CuFe–He OC increased with the cyclic reaction number, but deactivation occurred when SiO2 was used as a support (CuFe–Si). For the CuFe–Si OC, energy-dispersive spectrometer analysis results showed that both Cu and Fe distributed uniformly, and no obvious sintering was observed on the surface of OC particles from the scanning electron microscopy results. This deactivation was due to the irreversible interaction between the iron-based OC and SiO2. The CuFe–He OC was better than the CuFe–Al OC in accelerating fuel conversion due to its high oxygen capacity during chemical looping combustion of coal. Therefore, hematite was an excellent support candidate for manufacturing Cu–Fe OCs based on the impregnation method. The ratio of oxygen in OC to C in coal (O/C) had a significant impact on the coal conversion rate, and the O/C value should be above 7 for obtaining the desired coal conversion efficiency. Besides, increasing the reaction temperature promoted coal conversion effectively in chemical looping combustion of coal, especially with the CuFe–He OC, and a reaction temperature of above 850 °C was better.

中文翻译:

化学环流燃烧中不同载体的CuO–Fe 2 O 3载氧体的研究

在这项研究中,通过基于SiO 2,Al 2 O 3或赤铁矿载体的浸渍方法制备了Cu-Fe双金属氧载体(OCs),并在流化床反应器中研究了制备的OCs的特性。X射线衍射研究表明,OC中的Cu以CuFe 2 O 4的形式存在。在循环操作过程中,使用CO气体作为燃料,以赤铁矿(CuFe–He)或Al 2 O 3(CuFe–Al)为载体的Cu–Fe OCs表现更好,并且CuFe–He OC的反应性随循环而增加。反应数,但当SiO 2时发生失活被用作载体(CuFe-Si)。能量色散光谱仪分析结果表明,对于CuFe-Si OC,Cu和Fe均分布,从扫描电镜观察到OC颗粒表面没有明显的烧结现象。这种失活是由于铁基OC和SiO 2之间不可逆的相互作用。由于在煤化学循环燃烧过程中具有较高的氧气容量,因此在加速燃料转化方面,CuFe–He OC优于CuFe–Al OC。因此,赤铁矿是基于浸渍法制造Cu-Fe OCs的极好的载体候选物。OC中的氧气与煤中的C的比率(O / C)对煤的转化率有重大影响,为了获得所需的煤转化效率,O / C值应大于7。此外,提高反应温度可在煤的化学循环燃烧中有效地促进煤转化,特别是在使用CuFe-He OC的情况下,反应温度高于850°C更好。
更新日期:2021-02-04
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