改性SCR催化剂对Hg<sup>0</sup>催化氧化性能的研究

赵莉; 何青松; 李琳; 陆强; 董长青; 杨勇平

改性SCR催化剂对Hg⁰催化氧化性能的研究

华北电力大学生物质发电成套设备国家工程实验室, 北京 102206

基金项目: 国家重点基础研究发展规划(973计划, 2015CB251501); 中央高校基本科研业务费(2014ZD17)。

详细信息

通讯作者:
赵莉(1969-), 女, 博士, 副教授, 主要从事燃煤污染物控制技术研究, E-mail: zhaoli9533@163.com。

中图分类号: X51
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出版历程
- 收稿日期: 2015-01-08
- 刊出日期: 2015-05-30

Research on the catalytic oxidation of Hg⁰ by modified SCR catalysts

National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China

摘要

摘要: 采用一系列金属氧化物对商用SCR催化剂进行掺杂改性,筛选出最优Ce掺杂SCR催化剂,模拟实际烟气组分,考察了Ce改性催化剂对烟气中Hg⁰氧化的影响。实验结果表明,Ce掺杂比例适当可显著提高其催化活性,Ce最佳负载量为9%时,Hg⁰的催化氧化效率比未掺杂SCR催化剂提高近40%,BET和XRD也显示,CeO₂在催化剂表面分散程度较好,未出现聚集现象。烟气工况对Hg⁰的催化氧化具有重要影响,其中,烟气组分HCl显著促进了Ce改性催化剂对Hg⁰的氧化,在一定温度范围内,Hg⁰的氧化效率随着温度升高而增加,在最佳空速、温度和烟气组分浓度时,Hg⁰的催化氧化效率可达95.11%。此外,掺杂CeO₂之后SCR催化剂的脱硝性能并未受到影响。
- 改性SCR催化剂 /
- Hg⁰ /
- 催化氧化技术
Abstract: A series of metal oxides were employed to modify the commercial SCR catalyst, and the Ce modified SCR catalyst was selected and then subjected to detailed catalytic oxidation of Hg⁰ by using the simulated flue gas. The results indicated that the catalytic activity of the catalyst was increased remarkably after the Ce modification, and the highest catalytic oxidation of Hg⁰ was obtained from the modified SCR catalyst with 9% Ce loading, being 40% higher than that of the non-modified SCR catalyst. The BET and XRD analysis indicated that the surface area of the 1%~9% Ce modified SCR catalyst was no significant change compared with the non-modified SCR catalyst, and the CeO₂ was well dispersed on the catalyst surface, without any aggregation. The flue gas condition had great effects on the Hg⁰ conversion. The catalytic oxidation of Hg⁰ would be significantly increased by HCl, and also increased as the increasing of the temperature in a certain range. The highest catalytic oxidation efficiency reached 95.11% at the optimal space velocity, temperature and flue gas components. In addition, the CeO₂ doping did not affect the denitration efficiency of the SCR catalyst.
- modified SCR catalyst /
- Hg⁰ /
- catalytic oxidation

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