Deposition of pyrolytic carbon from the vapor phase onto the surface of various activated carbons, i.e., industrial (SKT and AG-3) and specially prepared via addition of KOH to a composition of carbon black with petroleum pitch followed by carbonization and washing, was studied. The deposition was carried out by passing benzene vapor in a stream of N 2 through heated activated carbon. The obtained modified samples were studied using molecular probes by measuring adsorption isotherms of benzene and CCl 4 at 20°C on the same samples. The results showed that the weight gain increased from 3% to 15% depending on the sample and the volume of micropores of width 0.4-0.6 nm increased to 0.07-0.15 cm 3 /g as the deposition time increased from 60 to 450 min. The modified activated carbons obtained in this manner could be used further to obtain carbon molecular sieves with pore sizes from 0.3 to 0.4 nm.

中文翻译：

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焦炭沉积对活性炭多孔结构的影响

研究了将热解碳从气相沉积到各种活性炭表面上，即工业活性炭（SKT 和 AG-3），特别是通过将 KOH 添加到炭黑与石油沥青的组合物中，然后进行炭化和洗涤而制备的. 通过使苯蒸气在N 2 流中通过加热的活性炭来进行沉积。使用分子探针通过测量苯和四氯化碳在 20°C 下在相同样品上的吸附等温线来研究获得的改性样品。结果表明，随着沉积时间从60分钟增加到450分钟，重量增加从3%增加到15%，取决于样品，宽度为0.4-0.6 nm的微孔的体积增加到0.07-0.15 cm 3 /g。