Poly(ethyleneimine)-Loaded Silica Monolith with a Hierarchical Pore Structure for H2S Adsorptive Removal

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• 作者：Qingjun Chen ; Feichao Fan ; Donghui Long ; Xiaojun Liu ; Xiaoyi Liang ; Wenming Qiao ; Licheng Ling
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：November 17, 2010
• 年：2010
• 卷：49
• 期：22
• 页码：11408-11414
• 全文大小：497K
• 年卷期：v.49,no.22(November 17, 2010)
• ISSN：1520-5045

文摘

Poly(ethyleneimine) (PEI) loaded hierarchical porous silica monolith has been developed as a recycle H₂S sorbent at low temperature. The sorbent was characterized by N₂ adsorption, scanning electron microscope, transmission electron microscope, Fourier transform infrared spectra, and activity tests. The effects of the amount of PEI loading, the operating temperature, and the PEI polymerization degree on H₂S removal were studied. The sorbent demonstrated a large H₂S breakthrough capacity of 1.27 mmol of H₂S/(g of sorbent) at 22 °C, which is about 60% larger than that of PEI-loaded SBA-15 or MCM-41 sorbent. The optimal PEI loading is 65 wt %, and the most ideal PEI molecular weight is 600. As the decrease of the temperature, the sorption performance of the sorbent increases greatly. There are two important factors affecting the performance of H₂S sorption: the amount of available PEI in the sorbent and the interaction between H₂S and amine functional groups of PEI. In addition, the developed sorbent can be regenerated easily at 75 °C, and it exhibits excellent regenerability and stability. These results indicate that PEI-loaded hierarchical porous silica sorbent will be promising for removing H₂S in the future.