Removal of siloxanes from biogas using acetylated silica gel as adsorbent

• 来源期刊: 石油科学（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 920-928
• 页数: 9页
• 语种: 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.