甲烷在活性炭上吸附平衡模型的研究

高帅 郑青榕

引用本文: 高帅, 郑青榕. 甲烷在活性炭上吸附平衡模型的研究[J]. 燃料化学学报, 2013, 41(3): 380-384. shu
Citation:  GAO Shuai, ZHENG Qing-rong. Comparisons of adsorption models for methane adsorption equilibrium on activated carbon[J]. Journal of Fuel Chemistry and Technology, 2013, 41(3): 380-384. shu

甲烷在活性炭上吸附平衡模型的研究

    通讯作者: 郑青榕(1967- ),男,博士,教授,主要从事燃气吸附存储、吸附制冷方面的研究。E-mail:zhengqr@jmu.edu.cn。
  • 基金项目:

    福建省自然科学基金(2011J01324) (2011J01324)

    福建省高等学校新世纪优秀人才计划支持计划(Z80136) (Z80136)

    福建省属高校专项课题(JK2010030)。 (JK2010030)

摘要: 比较吸附模型分析甲烷在活性炭上吸附平衡的适用性,为吸附式天然气(ANG)的工程应用提供准确的预测模型。基于在温度268.15~338.15 K、压力0~12.5 MPa测试的甲烷在Ajax活性炭上的吸附平衡数据,选择Langmuir、Langmuir-Freundlich和Toth方程,应用非线性回归拟合方程参数后,确定绝对吸附量和甲烷吸附相态,并比较方程在不同压力区域内的预测精度。结果表明,甲烷吸附相密度随平衡温度和压力变化;由绝对吸附量确定的甲烷在Ajax活性炭上的平均等量吸附热为15.72 kJ/mol,小于由过剩吸附量的标绘结果;Langmuir、Langmuir-Freundlich和Toth方程预测结果在0~0.025 MPa的累积相对误差为6.449 8%、7.918 4%和0.910 0%,在1~10 MPa为0.491 1%、0.161 3%和0.369 4%。Toth方程在整个压力范围内的预测结果最为准确,但Langmuir-Freundlich方程在较高压力区域内具有较高的预测精度。

English

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  • 收稿日期:  2012-08-30
  • 网络出版日期:  2012-11-21
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