摘要
首先,在温度区间113～293K、压力范围0～12.5MPa,测试氢在成型前后活性炭上的吸附等温线。其次,根据不同温度区域的等量吸附线标绘和Henry定律常数计算等量吸附热和极限吸附热,并通过Ono-Kondo方程对吸附数据进行模型分析。结果表明:等量吸附热的数值与温度有关,成型措施对吸附量的影响较大、对等量吸附热的影响较小,等量吸附热在试验温度范围内的平均值为6.8kJ·mol^(-1);标定参数后的Ono-Kondo方程预测精度较高。降低储存系统温度可有效缓解动态储氢过程的热效应。
The isosteric heat and the adsorption model of hydrogen on formed and unformed activated carbons were determined for the further study of the dynamic storage by adsorption of hydrogen. Acrylate was selected as a binder to form the activated carbon YK-1 prepared from coconut shell. Adsorption isotherms of hydrogen were measured at temperature from 113K to 293K and pressure up to 12.5MPa. The isosteric heats of adsorption at eight excess adsorption amounts and those at zero surface coverage were plotted by adsorption isosteres and the Henry law＇s constants at different temperature regions. Ono-Kondo equation was introduced to analyze the adsorption data. The results show that the specific surface ar- ea on formed activated carbon was cut down according to decrease of the adsorption amount, but isosteric heats of adsorp- tion on formed and unformed activated carbons varied with the adsorption amount similarly with an average value of 6.8k J- mol- 1 under the whole experimental condition. The results also show that Ono-Kondo equation fitted by the exper- imental data could much accurately predict the isotherms. Conclusions were drawn that lowering down the storage temper- ature was necessary for improving the adsorption amount and limiting the thermal effect in the dynamic storage process of hydrogen on the activated carbon.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2009年第6期850-854,共5页
Acta Energiae Solaris Sinica
基金
福建省高等学校新世纪优秀人才计划支持计划(C14294)
福建省教育厅资助项目(JA08148)
关键词
氢气
吸附储存
吸附模型
吸附热
活性炭
hydrogen
storage by adsorption
adsorption model
adsorption heat
activated carbon
