活性炭在高真空多层绝热中液氮温度下的吸气性能  

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

作　　者：谢斯卫[1] 朱鸣[1] 汪荣顺[1] 丁昌[1] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《低温与超导》2012年第8期12-15,34,共5页Cryogenics and Superconductivity

摘　　要：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。The N2 and Hz adsorption isotherms of activated carbon at liquid nitrogen temperature were obtained. The results show that activated carbon^laas 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 insula- tion material outside the activated carbon can greatly improve the adsorption capacity of activated carbon, especially for the N2 ad- sorption 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.

关 键 词：活性炭 液氮温度 等温吸附曲线 吸附量 

分 类 号：O647.3[理学—物理化学]