Removal of siloxanes from biogas using acetylated silica gel as adsorbent
投稿时间:2018-09-10  
英文关键词:Siloxanes, Biogas, Acetylated silica gel, Adsorption, Removal of the siloxanes
基金项目:We are grateful for the financial support from the National Natural Science Foundation of China (21677046) and the Natural Science Foundation of Hebei Province (B2017205146).
作者单位
Yu-Heng Liu College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, Hebei, China
College of Pharmaceutical Sciences, Hebei Medical University, Shijiazhuang 050017, Hebei, China 
Ze-You Meng College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, Hebei, China 
Ji-Ye Wang College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, Hebei, China 
Yan-Fei Dong College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, Hebei, China 
Zi-Chuan Ma College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, Hebei, China 
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英文摘要:
      Biogas can be used as an alternative energy source for producing heat and electricity; however, volatile methylsiloxanes (VOSiC) present in biogas can severely damage heat exchangers, turbines and gas engines. Consequently, efficient removal of VOSiC from biogas that is used as a biofuel is required. In this work, acetylated silica gel (Ac@SG) was synthesized, via treatment of microporous silica gel (SG) with acetic anhydride as an adsorbent, for removal of VOSiC from biogas, and characterized with XRD, SEM–EDS, N2- BET and FT-IR. This Ac@SG adsorbent exhibited a meso-/microporous structure and hydrophobic surface, indicating it was a more efficient adsorbent for removing hexamethyldisiloxane (L2) and octamethylcyclotetrasiloxane (D4) from biogas samples than conventional SG. It was found that the adsorption capacities of Ac@SG reached 304 mg L2/g for hexamethyldisiloxane and 916 mg D4/g for octamethylcyclotetrasiloxane at lower temperatures in the experimental range, and water had no significant effect on its absorption efficiency. The used Ac@SG could be easily regenerated by heating it at 110 ℃, and the adsorption capacity of recycled Ac@SG for hexamethyldisiloxane and octamethylcyclotetrasiloxane was kept constant in four recycle adsorption experiments.
Yu-Heng Liu,Ze-You Meng,Ji-Ye Wang,Yan-Fei Dong,Zi-Chuan Ma,2019.Removal of siloxanes from biogas using acetylated silica gel as adsorbent.Petroleum Science,16(4):920~928.
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