γ-Fe2O3/AC脱硫剂的制备及低温脱除CS2性能

doi:10.16085/j.issn.1000-6613.2017-2510

摘要/Abstract

摘要： 以活性炭（AC）为载体，用FeSO₄·7H₂O为原料，采用沉淀法制备Fe负载脱硫剂，通过XRD、FTIR、FE-SEM、ICP、H₂-TPR等方法对脱硫剂进行表征。从制备方法和焙烧温度的角度，研究脱硫剂低温脱除CS₂的性能以及造成其差异的原因。结果表明：采用FeSO₄先沉淀后焙烧，焙烧气氛是氮气的γ-Fe₂O₃/AC-N₂法生成的γ-Fe₂O₃结晶度最高，并且有效地增加了活性炭表面碱性基团数量，提高了负载量和分散性，使脱硫效果大大提升，当焙烧时有O₂存在会生成α-Fe₂O₃降低脱硫剂脱除CS₂的活性；使用γ-Fe₂O₃/AC-N₂法焙烧温度在500℃时，结晶度最高，脱硫剂的脱硫效果最好，吸附量达到40.41mg/g，当温度超过500℃时生成了Fe₃O₄，降低了脱硫效果，用4种动力学模型对γ-Fe₂O₃/AC在活性炭载体上的脱硫过程进行动力学描述，发现Elovich模型可以更好地描述CS₂在脱硫剂上的脱硫过程，其化学控制是主要因素。

关键词: 活性炭, 吸附剂, 动力学, 二硫化碳, 低温

Abstract: The iron loaded desulfurizers were prepared by precipitation method with AC as carrier and FeSO₄·7H₂O as raw material. The desulfurizers were characterized by XRD, FTIR, FE-SEM, ICP and H₂-TPR. The performance of the desulfurizers in the CS₂ low-temperature desorption was explored and the performance differences were analyzed from the aspects of preparation methods and calcination temperatures. The results showed that the crystallinity of generated γ-Fe₂O₃ was the highest when the precursors were calcined in N₂ after precipitation. The method increased the amount of basic groups on the surface of activated carbon, so that the capacity and dispersivity was increased. α-Fe₂O₃ was generated when the calcination gas contained oxygen, thus reduced the activation of CS₂ desorption on the desulfurizer. The adsorption capacity reached 40.41mg/g when the calcination temperature of γ-Fe₂O₃/AC-N₂ method was 500℃. Fe₃O₄ was generated when the temperature was over 500℃, which would reduce the desulfurization effect. The desulfurization process on γ-Fe₂O₃/AC was fitted by four kinetics models. It was shown that the Elovich model could best describe the desulfurization process of CS₂, and the main reaction control step was the chemical control.

Key words: activated carbon, adsorbents, kinetics, carbon disulfide, low temperature

中图分类号:

金健, 张智宏, 白鸿帆. γ-Fe₂O₃/AC脱硫剂的制备及低温脱除CS₂性能[J]. 化工进展, 2018, 37(11): 4397-4404.

JIN Jian, ZHANG Zhihong, BAI Hongfan. Preparation and performance of γ-Fe₂O₃/AC desulfurizer at low temperature for CS₂ removal[J]. Chemical Industry and Engineering Progress, 2018, 37(11): 4397-4404.

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γ-Fe₂O₃/AC脱硫剂的制备及低温脱除CS₂性能

Preparation and performance of γ-Fe₂O₃/AC desulfurizer at low temperature for CS₂ removal

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