纳米氧化锌在模拟煤气下吸附单质汞的实验研究

周劲松; 齐攀; 侯文慧; 游淑淋; 高翔; 骆仲泱

纳米氧化锌在模拟煤气下吸附单质汞的实验研究

浙江大学能源清洁利用国家重点实验室, 浙江杭州 310027

基金项目: 国家自然科学基金(51176171)。

详细信息

通讯作者:
周劲松(1970- ),男,浙江杭州人,主要从事煤的清洁燃烧、生物质能的综合利用等方面的研究,Tel:0571-87952041,E-mail:zhoujs@zju.edu.cn。

中图分类号: X701.7
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出版历程
- 收稿日期: 2013-07-10
- 修回日期: 2013-08-29
- 刊出日期: 2013-11-30

Elemental mercury removal from syngas by nano-ZnO sorbent

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 采用均匀沉淀法制备纳米氧化锌吸附剂,并采用BET、XRD、XPS等分析手段对其进行表征。在固定床吸附实验台上,研究了吸附剂在N₂和模拟煤气气氛下对单质汞的吸附特性,分析气体成分对纳米氧化锌脱汞性能的影响。结果表明,纳米氧化锌在纯N₂气氛下的脱汞效率较低,以物理吸附为主;H₂S的加入可以显著提高纳米氧化锌对汞的吸附,停止通入H₂S后,脱汞效率仍能维持较长时间;CO和H₂通过促进纳米氧化锌脱硫进而促进对汞的脱除。随着温度的提高,纳米氧化锌表面形成的单质硫逐渐减少,抑制了吸附剂对单质汞的吸附脱除。
- 汞 /
- 纳米氧化锌 /
- 脱汞效率 /
- 煤气气氛
Abstract: Nano-ZnO sorbents synthesized by a homogeneous precipitation method were characterized by BET (Brunauer-Emmett-Teller), XRD (X-ray diffraction) as well as XPS (X-ray photoelectron spectroscopy) analysis. The adsorption of elemental mercury by nano-ZnO under nitrogen and simulated gas atmosphere was studied on a bench-scale fixed-bed apparatus. The effect of various gases on Hg⁰ removal performance by nano-ZnO was analyzed. The results show that the mercury removal efficiency of the nano-ZnO is relatively poor in nitrogen atmosphere. The presence of H₂S promotes the Hg⁰ removal by nano-ZnO observably and the mercury removal efficiency can be maintained for a long time even after stopping pass into H₂S. The presence of CO and H₂ promotes the Hg⁰ removal because of desulfurization effect of nano-ZnO. As the temperature increases, the formation of elemental sulfur in the surface of the nano-ZnO decreases, which can suppress the removal of Hg⁰ by sorbent.
- elemental mercury /
- nano-ZnO /
- removal efficiency /
- gas atmosphere

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