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    Please use this identifier to cite or link to this item: https://ir.lib.ksu.edu.tw/handle/987654321/19664


    Title: 原位含氮基高比表面積活性碳對H2S吸附之研究
    Authors: 黃昭銘
    蔡仁豪
    彭柏洋
    Keywords: 三聚氰胺
    高比表面積活性碳
    H2S 吸附
    Activated carbons
    Biogas
    Hydrogen sulphide
    Date: 2012-10-29
    Issue Date: 2013-07-30 12:07:01 (UTC+8)
    Publisher: 行政院國科會:專題研究計畫
    Abstract: 本研究使用三聚氰胺-間苯二酚-甲醛(Melamine-Resorcinol- Formaldehyde, MRF)為碳前趨物,以不同比例的三聚氰胺添加量製備三種本質含氮活性碳(N-MRFAC),探討本質含氮活性碳對沼氣中H2S 動態吸附效率的影響。BET結果顯示MRFAC皆具有高比表面積2233-2548 m2/g、平均孔洞約2.6 -3.8 nm及孔體積約0.1-0.7 cm3/g 不等。由SEM得知此碳材為活性碳常見的片狀結構。經由FTIR 分析得知三聚氰胺能有效增加氮官能基團於活性碳表面,出現1565 cm-1的NH2 官能基。在硫化氫動態吸附結果顯示最大比表面積的MRF119 於30 oC 模擬乾燥沼氣(1% H2S/65% CH4/30%CO2/4%Ar)下對硫化氫吸附量可達412.78 mg/g,而三聚氰胺添加量最多的MRF115 則在第二與三吸附週期時仍保有88%與85%的吸附能力,約保有227 mg/g 和219 mg/g 的吸附量。本質含氮活性碳MRF115 與MRF117 在濕度RH%80 環境下,氮類官能基團與水參與吸附反應,進而增進活性碳對H2S 的吸附性能,對H2S 吸附量可達163 mg/g 和191 mg/g 的吸附量,並在第三吸附週期時還保有90%的H2S 吸附能力。雖微孔會阻塞硫化物導至吸附能力的下降,但如果適當的保有一定量的氮官能基團,在吸附表現上是仍保有一定的吸附能力。藉由高比表面積的物理快速吸附,再擴散至氮官能基團捕捉提供化學改質吸附,兩者相互配合可達到快速吸附且大吸附量的協同作用,在捕獲沼氣中H2S 方面頗具潛力。
    Nitrogen-containing activated carbons with high surface areas obtained from melamine, resorcinol and formaldehyde resins were evaluated as hydrogen sulphide (H2S) adsorbents in a simulated biogas stream. These melamine-resorcinol-formaldehyde carbons (MRFs) were prepared using various amounts of melamine. As-prepared MRFs were characterized by scanning electron microscopy, infrared (IR) spectra, N2 adsorption and desorption analysis, and dynamic adsorption of H2S. The results indicate that the MRFs have average pore size of 2.6-3.8 nm, pore volume of 0.1-0.7 cm3 g-1, and specific surface areas of 2233-2548 m2 g-1. A band at around 1565 cm− can be ascribed to the N-H group for all MRF samples, indicating nitrogen is successfully introduced into the carbon framework. The adsorption performance of H2S using three types of MRFs in three consecutive runs in a 1% H2S/65% CH4/30% CO2/4%Ar stream is verified. A sample MRF119 with the highest surface area exhibited excellent the highest H2S capacity of 412.78 mg g-1 under the first cycle at 30 °C and 130 kPa. The sample MRF115 had the best stability of H2S capacity, probably due to the existence of good textural properties and the highest amount of nitrogen species. The high capacity and stability offers the promising prospects for the application of MRFs as adsorbents for H2S removal.
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