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›› 2007, Vol. 7 ›› Issue (6): 1071-1076.

• 反应与分离 • 上一篇    下一篇

CuO/Al2O3吸附SO2后的氢再生及一体化回收硫磺：表征与机理

赵有华,刘振宇,贾哲华   

  1. 中国科学院山西煤炭化学研究所，煤转化国家重点实验室
  • 出版日期:2007-12-20 发布日期:2007-12-20

Regeneration of SO2-adsorbed CuO/Al2O3 with H2 and Recovery of Elemental Sulfur

ZHAO You-hua,LIU Zhen-yu,JIA Zhe-hua   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry Chinese Academy of Sciences
  • Online:2007-12-20 Published:2007-12-20

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摘要： 吸附SO2饱和的CuO/Al2O3可在400℃下的尾气循环过程中用还原剂H2对其再生. 在热重仪上进行程序升温还原再生实验，以考察尾气循环过程中吸附剂上Cu和S的相态变化. DTG曲线上分别于280和330℃处出现失重峰，表明吸附剂上的CuSO4在H2气氛中依次被还原为CuO和Cu. XPS表征结果则显示吸附剂上CuS由SO2和Cu反应生成. 在400℃、进口气H2/SO2摩尔比为1.5时的硫磺制备过程中，以H2再生后的CuO/Al2O3作催化剂，可获得50%以上的硫磺产率，表明在吸附剂的H2再生过程中生成的CuS是硫磺制备过程的催化剂.

关键词: CuO/Al2O3, 氢再生, 硫磺回收, 表征, 机理

Abstract: SO2-adsorbed CuO/Al2O3 can be regenerated with H2 through recycling the tail gas back into the reactor. The temperature-programmed regeneration experiments are carried out in a thermogravimetric analyzer to study Cu and S phase changes during tail gas recycling process. The existence of peaks in the DTG curve at 280 and 330℃, respectively, shows that CuSO4 formed during the SO2 removal transforms to CuO and then Cu, while the result of XPS characterization shows that CuS in the adsorbent is produced by the reaction of SO2 and Cu. An elemental sulfur yield of above 50% can be obtained in the sulfur recovery process at 400℃ with an H2/SO2 molar ratio of 1.5, which shows that CuS formed in the H2 regeneration of CuO/Al2O3 is the catalyst for elemental sulfur production.

Key words: CuO/Al2O3, H2 regeneration, elemental sulfur recovery, characterization, mechanism