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Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

  • Environmental Engineering
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Abstract

To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH3, coal-based AC was modified by H2SO4 under various conditions and then treated in N2 atmosphere at 400 °C. The resulting carbons were characterized by N2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH3 in the temperature range of 30–250 °C. Results reveal that H2SO4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H2SO4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH3 adsorption and then enhancing the SCR activity of modified carbons above 150 °C. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.

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Authors and Affiliations

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, P. R. China

    Qianqian Guo, Wen Jing, Shangzeng Cheng, Zhanggen Huang, Dekui Sun, Yaqin Hou & Xiaojin Han

  2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Qianqian Guo, Wen Jing & Shangzeng Cheng

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  1. Qianqian Guo
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  2. Wen Jing
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  3. Shangzeng Cheng
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  4. Zhanggen Huang
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  5. Dekui Sun
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  6. Yaqin Hou
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  7. Xiaojin Han
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Correspondence to Zhanggen Huang.

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Guo, Q., Jing, W., Cheng, S. et al. Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons. Korean J. Chem. Eng. 32, 2257–2263 (2015). https://doi.org/10.1007/s11814-015-0076-0

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  • DOI: https://doi.org/10.1007/s11814-015-0076-0

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