低温吸附泵用椰壳活性炭材料的结构测试分析

Microstructures of Coconut-Shell Activated Carbon Material for Cryoadsorption Pump

活性炭的结构参数影响低温吸附泵的吸附抽气性能。为了优选适用于NBI装置低温吸附泵的吸附剂,研究分析了六种椰壳活性炭(AC1、AC2、AC3、AC4、AC5、AC6)的结构特征,经实验测试,得到低温吸附等温线。应用BET理论、t图法、DFT法对孔结构进行了分析研究,获得了各活性炭样品的比表面积、微孔比表面积份额、比孔容积、以及孔径分布等结构测试数据。结果表明,六种活性炭中,AC1和AC2结构参数性能更适合NBI装置低温吸附泵的吸附抽气性能需求。

We reported the microstructures characterization of highly porous activated carbon made of coconut-shell,a promising adsorption material for cryogenic adsorption pump installed in Neural Beam Injector.The influence of the microstructures,including the specific surface-area,specific surface-area of micro-pore,specific pore volume and pore-size distribution of the six activated carbon types(labeled as ACs1-6),on cryoadsorption isotherm was experimentally evaluated,theoretically analyzed in BET theory,t-plot and DFT methods.The preliminary results show that when it comes to cryoadsorption,AC1 and AC2 outperform the four other activated-carbon types because of larger specific surface-area,bigger specific pore volume and higher adsorption capacity.Adsorption of AC1 and AC2,in a situation of large amount of gas and long-pulse gas injection,remains to be studied.