煤基大孔活性炭的制备及表征

Preparation and Characterization of Coal-based Macroporous Activated Carbon

以宁夏太西煤和乌兰煤为原料,通过适当的制备工艺合成出具有较高比表面积的大孔煤基活性炭,并用物理吸附仪和扫描电镜进行了表征.结果表明,化学活化法制备的活性炭中微孔所占比例较大而大孔相对较小.物理活化法制备的活性炭中虽然含有相当数量的微孔,但大孔所占比例显著提高,而且平均孔径随着原料中乌兰煤质量分数的增加而增大.扫描电镜分析表明,当乌兰煤质量分数为15%时,活性炭颗粒整体活化效果较好,大孔孔径分布均匀,其原因可能与太西煤和乌兰煤协同活化机制有关.

A special coal-based activated carbon with relatively larger sur{ace area and macropore was prepared by a suitable process with Taixi coal and Wulan coal from Ningxia. Samples were characterized with ASAP2010 gas adsorption instrument and scanning electron microscope （SEM）. Experiments results indicated that the activated carbon prepared by chemical method had relatively larger amount of micropores. On the other hand, the activated carbon prepared by physical method had a higher rate of masopores. The rate of masopores increased when the amount of Wulan coal added in the sample. The SEM results showed that the big holes distributed equally on the particles and activated completely when the rate of Wulan coal reached 15%. The real reason lay behind is not clearly understood yet, but the most capable explanation is that the particles of Taixi and Wulan coal were activated mutually with each other in the preparation process.