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本文采用流动色谱法,用ST—03表面与孔径测定仪,在液氮温度(—195.5℃)下测定了不同原料来源(煤、坚果壳、合成树脂)和不同的外形(颗粒状和纤维状)活性炭的吸附等温线,采用一点法B.E.T三参数法、层厚法、孔模型法计算其比表面,采用圆筒孔等效模型计算孔径分布,并用D—R方程计算微孔体积V_0和特征吸附能E等。对六种活性炭的比表面和孔径分布等的比较表明: 1.本文所研究的六种活性炭均系比表面大(>1000M~2/g)和微孔发达的物质。 2.此六种活性炭的ΔV/Δr～r曲线均具有多峰性质,有两种以上不同孔径的孔。 3.此六种活性炭的比表面,孔径分布、平均孔半径r、微孔体积V_0及特征吸附能E均比较接近,因此有可能作为同一催化反应的催化剂或载体。 4.六种活性炭的n值在1.0—1.5之间。 C值在100—1000之间。它们的吸附等温线均属于第Ⅱ和第Ⅳ类型。 5.这六种活性炭用一点法、B.E.T.三参数法、层厚法和BJH法计算的比表面均很接近,如果要求精确度不太高,采用一点法在相对压力较低条件下计算比表面比较快速简便。本文测试结果与B.E.T.重量法测定结果基本一致。
In this paper, different raw materials (coal, nutshell, synthetic resin) and different shapes (granular and fibrous) were measured by liquid chromatography with ST-03 surface and pore size analyzer at liquid nitrogen temperature (-195.5 ℃) ) Activated carbon adsorption isotherm. The BET specific surface area was calculated by the one-point BET method, the layer thickness method and the pore model method. The pore size distribution was calculated by using the equivalent cylinder bore model. The pore volume V_0 and characteristic Adsorption energy E and so on. The comparison of specific surface area and pore size distribution of six kinds of activated carbon showed that: 1. All of the six kinds of activated carbons studied in this paper are larger than the surface (> 1000M ~ 2 / g) and porous material developed. The ΔV / Δr ~ r curves of these six activated carbons all have multimodal characteristics, with two or more pores with different pore sizes. The specific surface area, pore size distribution, average pore radius r, micropore volume V_0 and characteristic adsorption energy E of these six activated carbons are close to each other, which makes it possible to act as a catalyst or support for the same catalytic reaction. 4. The six kinds of activated carbon n value between 1.0-1.5. C value between 100-1000. Their adsorption isotherms belong to the second and fourth types. 5. The six kinds of activated carbon by one-point method, BET three-parameter method, layer thickness method and BJH method to calculate the specific surface are very close, if the accuracy is not too high, the use of one-point method to calculate the specific surface area Quick and easy This test results and B.E.T. gravimetric determination of the results are basically the same.