Dynamical characteristics of methane adsorption on monolith nanometer activated carbon
Dynamical characteristics of methane adsorption on monolith nanometer activated carbon
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发表时间：
2008
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通讯作者：
Guo Liang;Xiao-feng Peng;Zhansong Wu
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作者：
Guo Liang;Xiao-feng Peng;Zhansong Wu
采用压差渗透法测定了甲烷在活性炭吸附剂上的表面扩散系数，采用Maxwell-Stefan模型研究了Knudsen扩散、粘性流动和表面扩散对甲烷在活性炭吸附剂上总扩散的影响，并对吸附剂的吸附动力学进行了研究。在实验温度和压力范围内，吸附动力学过程以表面扩散为主，而在较低压力下，Knudsen扩散也起重要作用，随着压力的增加，表面扩散系数逐渐增大，随着压力的增大，吸附速率逐渐增大，吸附速率逐渐增大。表面扩散系数趋于恒定，但粘性流不断增加，对总通量的贡献很大。
Activated carbon monolith is widely used as adsorbent to enhance the storage capacity of natural gas,which greatly inspires the investigation on adsorption dynamics of methane on this type of adsorbents.The differential pressure permeation method was used to measure the surface diffusion coefficient.The impacts of Knudsen diffusion,viscous flow and surface diffusion on total diffusion were investigated by using the Maxwell-Stefan model,and the dependence of these impacts on temperature and pressure was also discussed.An empirical correlation was proposed to calculate the surface diffusion coefficient.In the ranges of experiment temperature and pressure,the adsorption dynamic process was dominated by surface diffusion,while Knudsen diffusion was also important at a low pressures.As the pressure increased,the surface diffusion coefficient approached a constant value,however viscous flow kept continuously rising and contributing an important part to the total flux.