Speciation of mercury formed on MnOx-CeO2/γ-Al2O3 catalyst surface

LUO Xiaoyu; SU Sheng; XIANG Jun; WANG Yi; WANG Pengying; YOU Mo; LU Qi

doi:10.11949/j.issn.0438-1157.20141887

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Speciation of mercury formed on MnO_x-CeO₂/γ-Al₂O₃catalyst surface

更新时间：2025-12-10

- Speciation of mercury formed on MnO_x-CeO₂/γ-Al₂O₃catalyst surface
- CIESC Journal Issue 6, Pages: 2082-2088(2015)
- 作者机构：
  
  华中科技大学国家煤燃烧重点实验室,湖北,武汉,430074
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141887
  CLC： Q534.9
- Online First：05 June 2015，
  
  Published：05 June 2015
- 稿件说明：
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LUO Xiaoyu, SU Sheng, XIANG Jun, et al. Speciation of mercury formed on MnO_x-CeO₂/γ-Al₂O₃catalyst surface[J]. CIESC Journal, 2015, (6): 2082-2088. DOI: 10.11949/j.issn.0438-1157.20141887.
DOI：

LUO Xiaoyu, SU Sheng, XIANG Jun, et al. Speciation of mercury formed on MnO_x-CeO₂/γ-Al₂O₃catalyst surface[J]. CIESC Journal, 2015, (6): 2082-2088. DOI: 10.11949/j.issn.0438-1157.20141887. DOI：

摘要

为了高效经济地控制燃煤电站汞的排放

探索新型SCR催化剂上汞的催化氧化具有重要的学术价值和广阔的应用前景。Hg0在MnOx-CeO2/γ-Al2O3(MnCe15)催化剂上被氧化后会以多种形态存在于催化剂表面

为确定MnCe15催化剂上汞的化合物的赋存形态

使用程序升温热分解方法研究了纯汞化合物的分解曲线

并与在不同烟气条件下处理过的MnCe15催化剂的分解脱附曲线进行了对比。研究确认了反应中HgO、HgCl2、Hg(NO3)2和HgSO4的生成

并根据实验结果分析了相应的汞化合物生成的反应路径。结果表明

在模拟烟气条件下HgCl2是主要的异相催化反应产物

同时可以在催化剂表面检测到少量HgO和HgSO4的生成。这一结论可为研究SCR催化剂上Hg0的催化氧化机理提供基础。

Abstract

Hg0 oxidation over selective catalytic reduction (SCR) catalysts would be of great scientific and practical value to control mercury emission in coal-fired power stations. To elucidate the mercury species existing on the MnOx-CeO2/γ-Al2O3(MnCe15) catalyst surface

a temperature programmed thermal decomposition (TPTD) method was used in this study to analyze the characteristics of the mercury species formed on the MnCe15 catalysts. A series of pure mercury compounds mixed with fresh MnCe15 were first studied for qualitative calibration. Then

the TPTD method was used to identify the Hg species on used MnCe15 catalysts pretreated under different operation conditions. The formation of HgO

HgCl2

Hg(NO3)2 and HgSO4 during the oxidation process was confirmed and the reaction pathways were proposed. The mercury species present were mainly HgCl2 after MnCe15 catalysts were used to oxidize Hg0 under simulated flue gas conditions. HgO and HgSO4 were found to exist in very low concentrations. This study provided the basis for the study on catalytic oxidation mechanism of Hg0 on SCR catalyst.

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