Zhang Tengyan, Walawender Walter P, Fan L T
Department of Chemical Engineering, Kansas State University, Manhattan, KS 66506-5012, USA.
Bioresour Technol. 2005 Nov;96(17):1929-35. doi: 10.1016/j.biortech.2005.01.026.
To prepare carbon molecular sieves (CMSs), methane was pyrolyzed in an attempt to deposit fine carbon particles on the micropore mouths of the carbon substrates being heated; the carbon substrates included grain-based activated carbons and commercial activated carbons. To explore the effects of heat treatment alone, blank experiments were conducted by heating the samples in N2. The resultant products were characterized by N2-adsorption at 77K. Methane failed to deposit carbon at 800 degrees C. The porosity of activated carbons, however, was substantially influenced by heat treatment alone. The surface areas and micropore volumes of the activated carbons from grain sorghum decreased by 39.32% and 36.84%, respectively, upon heat treatment alone; this is attributable to the destruction of pore structure by sintering. In contrast, the corresponding values of the commercial activated carbons increased by 59.86% and 62.16%, respectively, upon heat treatment alone; this can be attributable to the development of microporosity.
为了制备碳分子筛（CMSs），对甲烷进行热解，试图在被加热的碳基质的微孔口上沉积细小的碳颗粒；碳基质包括谷物基活性炭和商业活性炭。为了探究仅热处理的效果，通过在氮气中加热样品进行了空白实验。所得产物通过77K下的氮气吸附进行表征。甲烷在800℃时未能沉积碳。然而，活性炭的孔隙率仅受热处理的显著影响。仅热处理后，高粱谷物活性炭的表面积和微孔体积分别下降了39.32%和36.84%；这归因于烧结导致的孔结构破坏。相比之下，仅热处理后，商业活性炭的相应值分别增加了59.86%和62.16%；这可归因于微孔的发展。
