以煤质炭化料为原料,分别以水蒸气和 CO 2为活化介质制备出微孔结构发达的活性炭.利用 N2吸-脱附等温线、碘吸附值、亚甲基蓝吸附值、CO 2吸附容量、CO 2解吸率和扫描电子显微镜(SEM)对其进行表征.结果表明,在实验室条件下,水蒸气法和 CO 2法制备样品的孔径均以0．5~1．0 nm 的微孔为主,在同等条件下,CO 2法制备样品0．5~1．0 nm 范围的微孔含量要比水蒸气法制备样品多10％以上.同时水蒸气法制备样品的中孔分布范围为2．0~3．0 nm,CO 2法制备样品中孔分布范围为2．0~2．5 nm.在同等实验条件下,水蒸气活化制备出活性炭比 CO 2的孔径分布更广,活性炭的亚甲基蓝吸附值、碘吸附值及 CO 2解吸率更高,而 CO 2法制备出的样品对 CO 2的吸附容量更大.
Developed microporous activated carbons were prepared from carbonized coal by using steam activation and CO 2 activation.The N2 adsorption-desorption isotherms,iodine value,methylene blue value,CO 2 adsorp-tion capacity,CO 2 desorption value and SEM were applied to characterize the activated carbons.The results showed that the main pore of activated carbons distributed in the range of 0.5-1.0 nm by using steam activation and CO 2 activation.In the same experiment condition,the pore content in the range of 0.5-1.0 nm obtained by CO 2 activation were 10% more than by steam activation,while the mesopore of activated carbons by using steam and CO 2 activation respectively distributed in the range of 2.0-3.0 nm and 2.0-2.5 nm.The methylene blue value,iodine value and CO 2 desorption value of activated carbons by using steam activation were higher than ac-tivated carbons by using CO 2 activation,but the CO 2 adsorption capacity of activated carbons by using CO 2 acti-vation were higher than activated carbons by using steam activation.
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