聚乙二醇改性酚醛树脂基球形炭吸附脱硫脱氮性能研究

Performance study on adsorption removal of sulfur and nitrogen compounds of carbon spheres derived from phenolic resin with polyethylene glycol

关键词:  酚醛树脂  球形炭  聚乙二醇  吸附  脱硫脱氮 

Key words:  phenolic resin  spherical carbon  polyethylene glycol  adsorption  desulfurization and denitrogenation

摘要:

运用扩展Stber方法合成酚醛树脂基球形炭。在合成过程中,引入不同含量和不同分子质量的聚乙二醇,对所制备球形炭的结构进行改性。并以吲哚、喹啉、二苯并噻吩(DBT)作为目标吸附质,考察球形炭对模型油中含硫含氮化合物的吸附性能。结果 表明,添加一定量聚乙二醇后,球形炭比表面积可提高至625 m²/g,微孔孔容增大为0.235 m³/g,对应的吸硫吸氮总量高达1.85 mmol/g。然而,当聚乙二醇添加量进一步增加时,在球形炭中形成的微孔孔径增大,比表面积和微孔孔容均减小,导致吸附量显著下降。此外,引入分子质量大的聚乙二醇,制备的酚醛树脂基球形炭的微孔孔容及吸附量均较大。

Abstract:

Extended Stber method was adopted to prepare phenolic resin based carbon spheres. polyethylene glycol (PEG) with different adding amount and molecular weight were introduced in the synthesis process to modify the structure of prepared carbon spheres samples. The model fuel containing indole, quinoline and dibenzothiophene (DBT) as target adsorbates were made. The effect of carbon spheres modification on the adsorptive performance of sulfur-containing and nitrogen-containing compound was investigated. The results showed that carbon spheres which were added proper amount of PEG had more developed microporous structure. The specific surface area of modified carbon sphere increased to 625 m²/g. The micropore volume also increased to 0.235 m³/g, corresponding to the highest adsorptive capacity of 1.85 mmol/g for sulfur and nitrogen compounds. However, as the adding amount of PEG was further increased, larger micropores were formed in the carbon sphere, both specific surface area and micropore volume decreased, which would result in significantly decrease of adsorption capacity. Besides, PEG with larger molecular weight could lead to higher micropore volume and adsorption capacity of phenolic-resin based carbon sphere.