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Surface modification of activated carbon for siloxane adsorption

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  • Gong, Huijuan
  • Chen, Zezhi
  • Fan, Yangmei
  • Zhang, Mengqun
  • Wu, Weili
  • Wang, Weibing

Abstract

The presence of siloxanes challenges the use of landfill gas (LFG) as a fuel for energy recovery, due to the formation of microcrystalline silica deposits during combustion. Activated carbon (AC) is often selected as an adsorbent for removing siloxanes from LFG. In order to find the key characteristics that affect the siloxanes adsorption capacity of AC, this paper studied the effects of AC textural structure and surface chemistry on siloxane adsorption. Anthracite AC was respectively treated by aqua ammonia, hydrochloric acid and heat to obtain modified AC with different surface properties. Adsorption capacities of the original and modified AC for octamethylcyclotetrasiloxane (D4) were measured. Results showed that most of the modified AC had a higher D4 adsorption capacity than the original AC. Several approaches were adopted to characterize the AC. The results obtained by nitrogen adsorption experiment revealed that all the employed modification methods changed the AC pore size distribution to some extent. The narrow mesopores on the AC surface are more desired for the siloxane adsorption. As for the AC surface functional groups, the results obtained by Boehm titration revealed that the alkaline and phenolic groups are favorable for siloxane adsorption, while the carboxylic groups are undesired for siloxane adsorption.

Suggested Citation

  • Gong, Huijuan & Chen, Zezhi & Fan, Yangmei & Zhang, Mengqun & Wu, Weili & Wang, Weibing, 2015. "Surface modification of activated carbon for siloxane adsorption," Renewable Energy, Elsevier, vol. 83(C), pages 144-150.
    • Handle: RePEc:eee:renene:v:83:y:2015:i:c:p:144-150
    DOI: 10.1016/j.renene.2015.04.004
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    References listed on IDEAS

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    1. Läntelä, J. & Rasi, S. & Lehtinen, J. & Rintala, J., 2012. "Landfill gas upgrading with pilot-scale water scrubber: Performance assessment with absorption water recycling," Applied Energy, Elsevier, vol. 92(C), pages 307-314.
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    1. Zheng, Yanhui & Hou, Xifeng & Liu, Yuheng & Ma, Zichuan, 2021. "Hexamethyldisiloxane removal from biogas using reduced graphene-oxide aerogels as adsorbents," Renewable Energy, Elsevier, vol. 178(C), pages 153-161.
    2. Kazimierz Gaj, 2020. "Adsorptive Biogas Purification from Siloxanes—A Critical Review," Energies, MDPI, vol. 13(10), pages 1-10, May.
    3. Abdulrasheed, A.A. & Jalil, A.A. & Triwahyono, S. & Zaini, M.A.A. & Gambo, Y. & Ibrahim, M., 2018. "Surface modification of activated carbon for adsorption of SO2 and NOX: A review of existing and emerging technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 1067-1085.
    4. Sun, Shengnan & Yu, Qiongfen & Li, Ming & Zhao, Hong & Wu, Chunxiang, 2019. "Preparation of coffee-shell activated carbon and its application for water vapor adsorption," Renewable Energy, Elsevier, vol. 142(C), pages 11-19.

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