摘要
采用低温氮吸附法表征了具有不同孔结构的碳纳米管、碳分子筛、活性炭、分子筛和石墨化炭黑等多孔材料的孔径分布。氮吸附一脱附等温线利用康塔公司NOVA3000在相对压力0．001-1范围内测定。五种材料的比表面积在100-1000m2／g之间。低压下的吸附等温线和高压下的脱附等温线分别用HK方法和BJH方法解析,结果表明:五种多孔材料既含有发达的微孔,又含有一定数量的中孔。孔径大小及其分布的细微信息在色谱采样中能够预测吸附剂的吸附性能,也是新型多孔材料开发的关键。
Five porous materials representing different pore structures were analyzed using adsorption and desorption isotherms of N2 at 77K. Studied porous materials,included carbon nanotubes,carbon molecular sieve,activated carbon,molecular sieve and graphitizing carbon black. Adsorption and desorption isotherms of N2 were measured in the relative pressure range of 0. 001～1 using NOVA 3 000（Quantachrome Instruments）. The BET specific surface areas of five samples are 100～ 1 000m^3/g. Adsorption isotherm data at low relative pressure were analyzed using the HK method,Desorption isotherm data at high relative pressure were analyzed using the BJH method, respectively. It shows that five porous materials containing a wide range of pore size includeing micropores and mesopores. The detailed description of the pore structure in terms of the pore size distribution may be used for correlation and prediction of the performance of porous materials in sampling application for chromatographic analysis as well as is the key in developing new porous materials.
出处
《炭素》
2006年第1期17-22,共6页
Carbon
关键词
氮吸附法
多孔材料
等温线
比表面积
孔结构
N2 adsorption
porous material
isotherm
specific surface area
pore structure
