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

ZHANG An-chao; ZHANG Zhi-hui; SHI Jin-ming; CHEN Guo-yan; ZHOU Chang-song; SUN Lu-shi

Volume 43 Issue 10

Oct. 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(10): 1258-1266

ZHANG An-chao, ZHANG Zhi-hui, SHI Jin-ming, CHEN Guo-yan, ZHOU Chang-song, SUN Lu-shi. Effect of preparation methods on the performance of MnOx-TiO2 adsorbents for Hg0 removal and SO2 resistance[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1258-1266.

Citation:

ZHANG An-chao, ZHANG Zhi-hui, SHI Jin-ming, CHEN Guo-yan, ZHOU Chang-song, SUN Lu-shi. Effect of preparation methods on the performance of MnO_x-TiO₂ adsorbents for Hg⁰ removal and SO₂ resistance[J]. Journal of Fuel Chemistry and Technology, 2015, 43(10): 1258-1266.

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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).

Received Date: 2015-07-01
Rev Recd Date: 2015-08-23
Publish Date: 2015-10-31

Abstract

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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