活性炭在高真空多层绝热中液氮温度下的吸气性能

通过实验获得了活性炭在液氮温度下对N2和H2两种气体的吸附等温线。结果表明:活性炭对N2的吸附效果非常好,对H2的吸附效果较差,相同平衡压力下对N2的吸附量比对H2的吸附量高出2～3个数量级,且在活性炭外包上绝热材料能大大提高其对气体的吸附能力,尤其是对N2的吸附量能提高2～3个数量级,对H2的吸附量也能提高1倍以上。用temkin吸附式对吸附等温线进行拟合,得到了活性炭在10-4～10Pa范围内适用的对N2和H2两种气体的吸附等温方程式。

Adsorption performance of activated carbon in high vacuum multilayer insulation at liquid nitrogen temperature

The N2 and H2 adsorption isotherms of activated carbon at liquid nitrogen temperature were obtained.The results show that activated carbon has a good adsorption performance for N2 and a little poor for H2.At the same equilibrium pressure,the N2 adsorption capacity of activated carbon is 2~3 orders of magnitude higher than the H2 adsorption capacity,and the insulation material outside the activated carbon can greatly improve the adsorption capacity of activated carbon,especially for the N2 adsorption capacity which can be improved by 2~3 orders of magnitude,the H2 adsorption capacity can also be doubled at least.In this paper,Temkin adsorption formula was used for the fitting of adsorption isotherms,adsorption isotherm formula respectively for N2 and H2 has been obtained which is applicable in the range 10-4 ~10Pa.