关键词:

甲烷, 吸附, 成型活性炭, 热效应

Abstract:

Comparative experiments were carried out to analyze the impact of the formation of the activated carbon on the behavior of methane adsorption.Acrylate was selected as a binder and different ratios of activated carbon to binder were chosen to form the activated carbon SAC-02 prepared from coconut shell.Six adsorption isotherms of methane on formed and unformed activated carbons were respectively measured at equilibrium pressure-temperatures from 0 MPa to 15 MPa and 268.15 K to 338.15 K, adsorption isosteres were then plotted to determine the isosteric heat of adsorption.A storage vessel packed with formed and unformed activated carbons was employed to undertake quick charge and discharge tests at ambient temperature under four pressures (6.5 MPa, 5.5 MPa, 4.5 MPa and 3.5 MPa).The temperature at the central region of the storage vessel was recorded for evaluating the impact of the formation of the activated carbon on the behavior of methane in the dynamic storage process.Results show that formation of the activated carbon cut down the adsorption amount due to a smaller specific surface area of the formed activated carbon, however, the isosteric heats of adsorption on the formed and unformed activated carbons are all within the range of 13—20.5kJ·mol^-1.Results also reveal that the formation of the adsorbent brings about a stronger fluctuation in the temperature in the initial state of quick charge and discharge processes.Conclusions are drawn that the heat conductivity of the binder and the transport resistance of the formed activated carbon should also be taken into account while forming the activated carbon.

Key words:

甲烷, 吸附, 成型活性炭, 热效应