科研之友
微信
新浪微博
Facebook
分享链接
摘要
Adsorptive storage of natural gas provides an alternative to the compression storage technology. Activated carbons can provide good storage capacity at relatively low cost. The volumetric storage capacity can be increased (two to three times) on carbon monoliths/pellets compared with the powdered form. The uptake rate and the effect of adsorption heat are important factors as the storage capacity must be realized rapidly for charging cycles. Methane adsorption kinetics was investigated on an activated carbon and its pellet in a batch adsorber at 298 K. The carbon was prepared by templated synthesis whereas the pellet was fabricated using a binderless method. Linear driving force (LDF) and Fickian diffusion (FD) models were utilized to study the kinetics. Both LDF and FD models can adequately describe the observed methane kinetics on the carbon samples when the dosing pressure >5 bar. The heat of methane adsorption was found as high as 22 kJ/mol, and it plays an important role in the observed kinetic rates on both carbon powder and the pellet. The adsorption kinetics on the pellet appears to be slightly faster than that on the powder due to the quicker dissipation of the sorption heat. The LDF model is recommended for the study of methane uptake kinetics onto both carbon samples because of its simplicity and flexibility, and ability to model the data at both low and high sorption pressures. The effects of isotherm nonlinearity and surface heterogeneity were also discussed.
- 出版日期2011-4
- 单位南阳理工学院
