Effects of temperature and oxygen content on Hg<sup>0</sup> oxidation and adsorption by rice husk char impregnated with NH<sub>4</sub>Br

YAO Ting; DUAN Yufeng; ZHU Chun; ZHOU Qiang; SHE Min; CHEN Yanan

doi:10.11949/j.issn.0438-1157.20151368

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Effects of temperature and oxygen content on Hg⁰ oxidation and adsorption by rice husk char impregnated with NH₄Br

更新时间：2025-12-10

- Effects of temperature and oxygen content on Hg⁰ oxidation and adsorption by rice husk char impregnated with NH₄Br
- CIESC Journal Issue 4, Pages: 1467-1474(2016)
- 作者机构：
  
  东南大学能源热转换及其过程测控教育部重点实验室,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151368
  CLC： Q534.9
- Online First：05 April 2016，
  
  Published：05 April 2016
- 稿件说明：
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YAO Ting, DUAN Yufeng, ZHU Chun, et al. Effects of temperature and oxygen content on Hg⁰ oxidation and adsorption by rice husk char impregnated with NH₄Br[J]. CIESC Journal, 2016, (4): 1467-1474. DOI: 10.11949/j.issn.0438-1157.20151368.
DOI：

YAO Ting, DUAN Yufeng, ZHU Chun, et al. Effects of temperature and oxygen content on Hg⁰ oxidation and adsorption by rice husk char impregnated with NH₄Br[J]. CIESC Journal, 2016, (4): 1467-1474. DOI: 10.11949/j.issn.0438-1157.20151368. DOI：

摘要

采用10 g·L-1 NH4Br溶液对原始稻壳焦进行浸渍改性制备了脱汞吸附剂。利用比表面积及孔隙度分析仪、扫描电子显微镜/X射线能谱分析仪对改性前后稻壳焦吸附剂物理化学性质进行表征。在固定床汞吸附实验台上对吸附剂床层出口元素汞(Hg0)和二价汞(Hg2+)进行同步检测

研究了不同温度下N2气氛和N2+6.4 %(体积)O2气氛中改性稻壳焦的汞氧化吸附特性。50℃下N2气氛、N2+6.4%(体积)O2气氛以及150℃下N2气氛中固定床出口均未明显检测到Hg2+

50℃和150℃时脱汞率均可达90%。温度为150℃时

在N2+6.4%(体积)O2气氛中吸附剂的总汞(HgT)脱除效率为98.2%

其中82.2%的Hg0被吸附脱除

其余则被O2非均相氧化为Hg2+而氧化脱除。通过对程序升温管式炉出口HgT进行检测研究了吸附剂表面吸附态汞的脱附特性。汞脱附峰值温度300℃表明吸附态汞可能以Hg-Br化合物的形式赋存于改性稻壳焦表面

220~350℃的脱附温度说明吸附态汞有较高的热稳定性。100.14%~118.62%的汞平衡率验证了实验结果的准确性。

Abstract

The mercury sorbent was prepared from raw rice husk char impregnated with 10 g·L-1 NH4Br solution. The physical-chemical characteristics of sorbents before and after modification were analyzed by surface area and porosity analyzer

scanning electron microscopy and X-ray energy dispersive spectroscope. The mercury oxidation and adsorption performance of the modified sorbents were investigated by analyzing mercury speciation (Hg0 and Hg2+) in the outlet of a fixed bed reactor system in N2 and N2+6.4%(vol)O2 atmosphere at different temperatures. No obvious Hg2+ was detected in N2

N2+6.4%(vol)O2 atmosphere at 50℃ and N2 atmosphere at 150℃. Modified rice husk char exhibited a mercury removal efficiency of 90% at 50℃ and 150℃. Total mercury (HgT) removal efficiency of 98.2% was obtained in N2+6.4%(vol)O2 atmosphere at 150℃

82.2% Hg0 was bound to the sorbent surface

the remaining was removed in the form of Hg2+ which was generated from heterogeneous oxidation by O2 at the surface of sorbent. The heterogeneous reaction between O2 and gaseous Hg0 at relatively elevated adsorption temperature promotes the Hg0 oxidation efficiency of modified sorbents. Desorption performance of adsorbed mercury was identified by analyzing HgT at the outlet of temperature programmed tube furnace. Peak mercury desorption temperature of 300℃ manifested that mercury was bound to sorbent surface in the form of Hg-Br compound most likely. Mercury desorption temperature between 220℃ and 350℃ suggested high thermal stability of adsorbed mercury. Mercury balance ratio of 100.14%—118.62% verified the accuracy of experimental results in this study.

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Effects of temperature and oxygen content on Hg0 oxidation and adsorption by rice husk char impregnated with NH4Br

DOI：10.11949/j.issn.0438-1157.20151368

摘要

Abstract

关键词

Keywords

references

Effects of temperature and oxygen content on Hg⁰ oxidation and adsorption by rice husk char impregnated with NH₄Br