甲烷在活性炭上吸附平衡模型的研究.pdf

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1、第41卷第3期燃料化学学报Vo1．41No．32013年3月JournalofFuelChemistryandTechnologyMar．2O13文章编号：0253-2409(2013)03-0380-05甲烷在活性炭上吸附平衡模型的研究高帅，郑青榕(集美大学轮机工程学院，福建省船舶与海洋工程重点实验室，福建厦门361021)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268．15～338．15K、压力0～12．5MPa测试的甲

2、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15．72kJ／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—0．025MPa的累积相对误差为6．4498％、7．91

3、84％和0．910O％，在1～10MPa为0．4911％、0．1613％和0．3694％。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。关键词：吸附平衡；甲烷；活性炭；模型中图分类号：TQ028文献标识码：AComparisonsofadsorptionmodelsformethaneadsorptionequilibriumonactivatedcarbonGAOShuai，ZHENGQing—rong(Provinc

4、ialKeyLaboratoryofNavalArchitecture＆OceanEngineering，InstituteofMarineEngineering，JimeiUniversity，Xiamen361021，China)Abstract：Comparisonsofaccuraciesofadsorptionmodelsinpredictingadsorptiondataofsupercriticalmethaneonactivatedcarbonwerecarriedoutforprac

5、ticalapplicationofadsorptionofnaturalgas(ANG)．Aiaxactivatedcarbonwasselectedasanadsorbent．sixisothernlsofexcessadsorptionamountofmethaneweremeasuredattemperaturefrom268．15Kto338．15Kandpressureupt012．5MPa．ParametersofLangmuir．Langmuir—FreundlichandTotheq

6、uationswerefirstlysetbythelinearfitofadsorptiondata，absoluteamountsanddensitiesoftheadsorbedphaseofsupercriticalmethanewerethendeterminedbythemodifiedmodels．IsostericheatsofmethaneadsorptiononAjaxactivatedcarbonweredeterminedbyadsorptionisosteresontheab

7、soluteamounts．Comparisonsweremadebetweenexperimentaldataandthosepredictedbymodels．Resultsshowedthattheadsorbedphasedensitiesofsupercriticalmethaneontheactivatedcarbonvariedwithequilibriumtemperaturesandpressures．themeanvaltieofisostericheatofadsorptions

8、etbyabsoluteamountswas15．72kJ／mo1．whichwassmallerthanthatplottedfromtheexcessamounts．TherelativeerrorsbetweentheexperimentaldataandthosepredictedbyLangmuir。Langmuir．FreundlichandTothequationsvariedwiththepressure，Theaccumulatedre