石油焦系活性炭的吸附脱硫

石油焦系活性炭的吸附脱硫

  • 摘要: 选取独山子石油焦为原料,以物理活化法制得比表面积达500m2/g~900m2/g的活性炭,进行吸附脱硫研究。采用酸氧化法对活性炭孔结构和微观孔径分布进行改性。酸氧化使活性炭表面酸性官能团含量明显增加,增加量约为原来的5倍。活性炭吸附脱硫性能随表面酸性官能团含量的增加而增大。理想的酸化条件是浓硝酸120℃氧化40min。通过静态吸附实验,活性炭吸附脱硫的最佳条件是,温度25℃,压力1.0MPa,静态吸附6h。最佳条件下吸附脱硫可使模型化合物硫的质量分数从137.9×10-6降至3.1×10-6。从活性炭孔径匹配考察可知,平均孔直径在0.8nm~2.1nm的活性炭对模型化合物硫的质量分数降低具有明显效果。

     

    Abstract: Adsorption desulfurization by activated carbon obtained from DuShanzi petroleum coke was investigated. The activated carbon was prepared through the improved physical activation and the surface area reached 500m2/g~900m2/g; its porous structure and distribution were modified by acid oxidation. With the surface acid oxidation, the amounts of oxygen function groups on the activated carbon surface increases for almost 5 times more than those on the original activated carbon. The optimum nitric acid oxidation conditions are 120oC and 40min. The optimum process conditions of desulfurization are 25oC, 1.0MPa and 6 hours by static status adsorption. Under these conditions, the sulfur content of model compound decreases from 137.9×10-6to 3.1×10-6. Activated carbon with the average pore diameter from 0.8nm to 2.1nm was effective to reduce the sulfur content in the model compound, it suggest that such a microporous structure could benefit the desulfurization.

     

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