燃料化学学报2012，Vol.40Issue(7)：892-896,5.
超临界甲烷在活性炭上的吸附平衡分析
Adsorption equilibrium of supercritical methane on activated carbon
摘要
Abstract
Equilibrium adsorption data of methane on Ajax activated carbon were volumetrically measured under a temperature of 268.15 ~ 338.15 K and a pressure up to 13.5 MPa. Accessible volumes for methane molecules and critical pore width for methane effective adsorption were introduced; on the basis of these concepts, the mass balance of the adsorbate confined within the adsorption cell was used to determine the relationship among the total amount, excess adsorption amount and absolute adsorption amount. By considering the accessible volume and critical pore width, the excess adsorption amount was obtained by the pore size distribution (PSD) determined by Nonlocal Density Functional Theory (NDFT) calculation. The equilibrium adsorption data were fitted by Toth model through nonlinear regression, which was verified the accuracy in predicting the absolute adsorption amount. The isosteric heat of methane adsorption on activated carbon was over-estimated by using the excess amounts, but underestimated by using the total amounts. The isosteric heat of adsorption should be determined from the adsorption isosteres of absolute adsorption amount when considering the thermal effect in adsorption process.关键词
甲烷/活性炭/吸附平衡/吸附模型Key words
methane/ activated carbon/ adsorption equilibrium/ adsorption model分类
化学工程引用本文复制引用
郑青榕,廖海峰,解晨,智会杰..超临界甲烷在活性炭上的吸附平衡分析[J].燃料化学学报,2012,40(7):892-896,5.基金项目
福建省高等学校新世纪优秀人才计划(Z80136) （Z80136）
福建省科技厅高校专项(JK2010030) （JK2010030）
福建省自然科学基金(2011J01324). （2011J01324）
