吸附法深度脱除液化石油气中硫化物的研究

发布时间：2018-01-08 15:18

  本文关键词：吸附法深度脱除液化石油气中硫化物的研究　出处：《华东理工大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 液化石油气 活性白土 Al-MCM-41 吸附脱硫

【摘要】：本文研究了混捏法和等体积浸渍法制备改性吸附剂,采用固定床动态吸附的方式考察吸附剂脱除LPG中硫化物的性能,并使用XRD、BET、TG-DSC、Raman、Py-IR、SEM、TEM、FTIR等技术对吸附剂进行表征及吸附脱硫机理研究。研究表明,混捏法制备的含铜化合物改性活性白土吸附剂有良好的脱硫效果,同时发现含铜化合物中的阴离子对脱硫过程无影响,起决定作用的是铜离子,并通过XRD分析可知,当铜在吸附剂上以Cu2(OH)3N03的形式存在时,脱硫效果要好于铜以CuO的形式存在。当铜负载量为15 wt%,焙烧温度为150℃时,吸附剂脱硫性能达到最佳。通过Py-IR分析可知,铜改性活性白土吸附剂可以提高吸附剂的L酸量,有利于对硫化物的吸附;利用Raman分析可知,铜改性活性白土吸附剂是通过络合S-M的方式脱除硫化物,且Cu(I)比Cu(II)与硫化物之间有更多的结合位点,其脱硫效果明显好于后者。等体积浸渍法制备杂多酸改性A1-MCM-41吸附剂脱硫效果较未改性吸附剂有明显的提高,且磷钨酸的效果好于磷钼酸。当杂多酸的负载量为25wt%,焙烧温度为550℃时吸附剂脱硫性能最佳。通过Py-IR分析可知,负载杂多酸可以提高吸附剂的酸量,促进吸附剂对硫化物的吸附。同时发现,杂多酸改性A1-MCM-41吸附剂有着优良的再生性能,最好的再生条件为:空气气氛中再生温度为550℃,时间为5h。
[Abstract]:In this paper, the modified adsorbents were prepared by kneading method and iso-volume impregnation method. The performance of adsorbent in removing sulfides from LPG was investigated by means of dynamic adsorption in fixed bed, and XRD-BET was used. The adsorbents were characterized and desulfurized by TG-DSC-Raman-Py-IRTM-SEMM-TME-FTIR. The results show that the adsorbents can be adsorbed and the desulfurization mechanism of the adsorbents is also studied. The modified activated clay adsorbent prepared by kneading method has a good desulfurization effect. At the same time, it is found that the anions in the copper-containing compounds have no effect on the desulphurization process, and copper ions play a decisive role in the desulfurization process. The results of XRD analysis showed that the desulfurization effect of copper was better than that of copper in the form of CuO when copper was adsorbed on the adsorbent in the form of Cu2(OH)3N03. When the amount of copper loaded on the adsorbent was 15 wt%, the desulfurization effect was better than that of copper in the form of CuO. When the calcination temperature is 150 鈩，

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