制备方法对MnOx鄄TiO2吸附剂脱汞及抗硫性能的影响

张安超; 张志会; 石金明; 陈国艳; 周长松; 孙路石

制备方法对MnO_x鄄TiO₂吸附剂脱汞及抗硫性能的影响

1.
河南理工大学机械与动力工程学院, 河南焦作摇454003;
2.
江西省科学院能源研究所, 江西南昌摇330096;
3.
华中科技大学煤燃烧国家重点实验室, 湖北武汉摇430074

基金项目: 国家自然科学基金(51306046,51166004,51376073)和河南省高校基本科研业务费(NSFRF140204)

详细信息

通讯作者:
张安超,Tel:15039126550,E-mail:anchaozhang@126.com.

中图分类号: X511
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出版历程
- 收稿日期: 2015-07-01
- 修回日期: 2015-08-23
- 刊出日期: 2015-10-31

Effect of preparation methods on the performance of MnO_x-TiO₂ adsorbents for Hg⁰ removal and SO₂ resistance

1.
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2.
Institute of Energy Conversion, Jiangxi Academy of Sciences, Nanchang 330096, China;
3.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Funds: The project was supported by the National Natural Science Foundation of China (51306046, 51166004, 51376073), the Fundamental Research Funds for the Universities of Henan Province (NSFRF140204).

摘要

摘要: 针对燃煤烟气中单质汞(Hg⁰)不溶于水很难去除和锰基吸附剂抗硫能力差的问题,以浸渍法、溶胶鄄凝胶法和沉积鄄沉淀法等三种方法制备MnO_x 鄄TiO₂ 为吸附剂,在固定床实验台架上考察了制备方法对MnO_x 鄄TiO₂ 吸附剂Hg⁰ 吸附量和抗硫性能的影响;利用N₂ 吸附/ 脱附、TG鄄DSC、XRD、TEM、H2鄄TPR 和XPS 等手段对吸附剂进行表征。结果表明,制备方法对MnO_x 鄄TiO₂ 吸附剂的脱汞活性影响颇大;沉积鄄沉淀法制备的MnO_x 鄄TiO₂ 吸附剂具有较高的Hg0 吸附量和抗硫能力。吸附剂的BET 比表面积高低与其脱汞活性无直接相关性;与浸渍法和溶胶鄄凝胶法相比,沉积鄄沉淀法制备的MnO_x 鄄TiO₂ 吸附剂不但可以增强其还原性和MnO_x分散度,而且还会显著提高吸附剂表面Mn⁴⁺/Mn 的比率和表面化学吸附态氧含量,进而增强吸附剂的脱汞活性和抗硫性能。
- 制备方法 /
- MnO_x-TiO₂ /
- 脱汞 /
- 抗硫性能 resistance
Abstract: Aiming at the difficulty of elemental mercury (Hg⁰) removal from flue gas due to its indissolubility in water and the problem of lower SO₂ resistance performance of manganese-based adsorbent, the MnO_x-TiO₂ adsorbents prepared with impregnation (IM), sol-gel (SG) and deposition-precipitation method (DP) were employed to remove Hg⁰ in the absence and presence of SO₂. The adsorbents were characterized by N₂ adsorption-desorption, TG-DSC, XRD, TEM, H₂-TPR, and XPS techniques. The results showed that Hg⁰ removal performance over MnO_x-TiO₂ adsorbents was markedly influenced by the preparation methods. The adsorbent prepared by DP method exhibited a superior activity for Hg⁰ adsorption and the best SO₂ resistance performance. The characterization results indicated that the Hg⁰ removal activity did not correlate with the BET surface area. The preparation method of deposition-precipitation could not only lead to an increase of reducibility and high dispersion of MnO_x, but also significantly enhance a migration of well-dispersed active phase from bulk to surface, resulting in a higher Mn⁴⁺/Mn ratio and the presence of abundant chemisorbed oxygen, which would play an important role in promoting Hg⁰ removal.
- preparation method /
- MnO_x-TiO₂ /
- Hg⁰ removal /
- SO₂ resistance

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