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Regeneration performance and characteristic of iron oxide/arenaceous sorbents in the atmosphere of O-2/N-2

机译：O-2 / N-2气氛中氧化铁/芳烃吸附剂的再生性能和特性

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The performance and the change characteristic of iron oxide/arenaceous sorbent in the regeneration reaction are systematically investigated by studying the effects of temperature, space velocity and O-2 concentration on the sorbent in a fixed-bed quartz reactor. Sulfidation-regeneration cycles were also conducted to evaluate the reusability of the sorbents. The surface and bulk structural features of the sorbents, both before and after regeneration, were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, energy dispersive spectroscopy, Fourier transform infrared spectroscopy and N-2 adsorption-desorption. The results show that the sorbents exhibit the highest regeneration rate at the conditions of 6 vol.% O-2, 650 degrees C, and space velocity of 3000 h(-1). After five sulfidation-regeneration cycles, the breakthrough curves of regenerated sorbents changed slightly and the regeneration rates of the regenerated sorbents still exceeded 95%. The characterization data indicates that the outer layer electron density of surface atoms decreased in the regeneration process, which adversely affects the adsorption rate of acidic H2S and the reaction rate of H2S with Fe2O3 on the surface of sorbents. It can be seen from XRD analysis that the particle size of the sorbent gradually increased as the number of sulfidation-regeneration cycles increased, leading to reduced surface area and blocked pore structure. Furthermore, the internal structure deteriorated due to sintering, which resulted in the lowered sulfidation performance of the regenerated sorbent. (C) 2016 Elsevier Ltd. All rights reserved.
机译：通过研究温度，空速和O-2浓度对固定床石英反应器中吸附剂的影响，系统地研究了氧化铁/芳烃吸附剂在再生反应中的性能和变化特性。还进行了硫化再生循环以评估吸附剂的可重复使用性。通过X射线衍射，X射线光电子能谱，扫描电子显微镜，能量分散光谱，傅立叶变换红外光谱和N-2吸附-脱附表征了吸附剂在再生前后的表面和整体结构特征。结果表明，吸附剂在O-2为6％（体积），650摄氏度，空速为3000 h（-1）的条件下表现出最高的再生速率。经过五个硫化再生循环后，再生吸附剂的穿透曲线略有变化，再生吸附剂的再生率仍超过95％。表征数据表明，表面原子的外层电子密度在再生过程中降低，这不利地影响了酸性H2S的吸附速率以及H2S与Fe2O3在吸附剂表面的反应速率。从XRD分析可以看出，随着硫化再生循环次数的增加，吸附剂的粒径逐渐增加，导致表面积减小和孔结构堵塞。此外，内部结构由于烧结而劣化，这导致再生吸附剂的硫化性能降低。 （C）2016 Elsevier Ltd.保留所有权利。

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