GH-O型椰子壳活性炭低温吸放气特性研究

本文通过低温(18～22K),低压(10~(-5)～10~(-2)Pa)下,H_2在 GH-O型椰子壳活性炭上吸附等温线、吸附动办学特性和常温放气特性的实验研究,着重讨论了在实验条件下,GH-O 活性炭对 H_2的吸附容量、吸附热、吸附平衡时间和扩散系数 D 与活性炭的表面温度、表面覆盖度、空间压强等的变化关系.结果发现,H_2在 GH-O 活性炭上的吸附等温线符合弗洛德利胥方程;对 H_2的最大吸附量为170cm~3(STP)/g;吸附热由吸附量的10cm~3(STP)/g 的344J/mol(1440cal/mol)降到170cm~3(STP)/g 的238.8J/mol(1000cal/mol);吸附平衡时间 t_∞为2～5h;在(18～22K)时,扩散系数 D 约为10~(-7)cm~2/s 数量级.

Study of the Characteristics of Cryo-Adsorption and Desorption on GH-O Type Coco-Charcoal

Based on the experimental studies of the adsorption isotherms and the characteristics of adsorption kinetics of H_2 on GH-O type coco-charcoal at low temperature (18-22 K) and low pressure (10~(-5)-10~(-2) Pa),the dependence of adsorption capadity,adsorption heat,equillibrium time and diffussion coefficient on the surface temperature,surface coverage-factor and space pre- ssure of charcoal is mainly disscussed.It has been found that the adsorption is otherms of H_2 fits with the Freundlich Equation;the adsorption heat is decreased from 344 to 288.8 J/mol when the quantity of adsorption is rised from 10 to 170 cm~3(STP)/g;the equillibrium time is 3-5h;the diffussion coefficient D at 18-22K is of the order of 10cm~2/s.