NiO/ZnO-Al<sub>2</sub>O<sub>3</sub>吸附剂吸附脱除焦炉气中COS

周广林; 王美庆; 王晓胜; 姜伟丽; 周红军

NiO/ZnO-Al₂O₃吸附剂吸附脱除焦炉气中COS

中国石油大学(北京) 新能源研究院, 北京 102249

基金项目: 国家高技术研究发展计划(863计划,2011AA05A202)。

详细信息

通讯作者:
周广林(1966-), 男, 山东郓城人, 博士后, 副教授, 研究方向为石油天然气工业、燃料化工等。Tel:010-89731300-803, Fax:010-89731300-808, E-mail:zhouguanglin2@163.com。

中图分类号: O643.38
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出版历程
- 收稿日期: 2014-10-30
- 刊出日期: 2015-04-30

Removal of COS in coke-oven gas by NiO/ZnO-Al₂O₃ adsorption

Institute of New Energy, China University of Petroleum(Beijing), Beijing 102249, China

摘要

摘要: 采用浸渍法制备了NiO/ZnO-Al₂O₃吸附剂,在固定床装置上对模拟焦炉气中的COS进行吸附脱除,并采用XRD和压汞仪对吸附剂进行了表征。实验结果表明,吸附反应适宜的工艺条件为350 ℃、0.40 MPa、空速500~1 000 h^-1,在此条件下吸附剂可将焦炉气中的COS从320~450 mg/m³降低至0.5 mg/m³,烯烃的体积分数从2.3%~4.5%降为0,其他组分含量不变,吸附剂穿透硫容为17.18%。吸附剂的再生实验表明,吸附剂再生前后晶形、孔结构及硫容变化不大,吸附剂具有较好的再生性能。通过实验总结出脱硫过程为COS首先吸附在还原态Ni原子上,在Ni作用下COS中S-C断裂生成NiS,然后生成H₂S,H₂S与ZnO反应生成ZnS。
- 焦炉气 /
- 吸附剂 /
- COS /
- 烯烃 /
- 脱硫
Abstract: The NiO/ZnO-Al₂O₃ adsorbent was prepared by incipient method and characterized by XRD and mercury porosimeter. The performance of the adsorbent in the removal of COS from the simulated coke-oven gas was tested in a fixed-bed reactor. The results show that the appropriate reaction conditions are 350 ℃, 0.40 MPa and GHSV of 500~1 000 h^-1. The adsorbent could remove COS from 320~450 mg/m³ to 0.5 mg/m³ as well as olefins from 2.3%~4.5% to 0 without changing other component. The breadthrough sulfer capacity is 17.18%. The regeneration test shows that the crystal form, pore structure and sulfer capacity of the regenerated adsorbent have no significant change compared with the fresh adsorbent. A desulfurization mechanism is proposed as follows:first COS is absorbed on the reduced Ni atoms to form NiS via the breaking of the S-C bond, then NiS is transformed to H₂S in the presence of H₂, finally H₂S is captured by ZnO.
- coke-oven gas /
- adsorbent /
- COS /
- olefins /
- desulfurization

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参考文献(13)

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