添加剂作用下煤基中孔活性炭的制备

PREPARATION OF COAL-BASED MESOPOROUS ACTIVATED CARBONS BY ADDITIVE

以贫煤为原料,硝酸盐为添加剂,制得中孔发达的活性炭.利用N2吸附脱附曲线对样品孔隙结构进行了表征,并考察了其吸附性能(碘值和亚甲蓝值).结果表明,未加添加剂时,可以得到中孔孔容0.287 4 mL/g,中孔率达72.43%的活性炭;加入添加剂后,微孔孔容和中孔孔容提高了0.05 mL/g左右.结果还表明,实验用硝酸盐有利于微孔的形成,能促进微孔向中孔的发育,提高总孔容;利用不同浓度的添加剂对活性炭的孔隙可进行定向调变.

Mesoporous activated carbons were prepared from a lean coal in the presence of additive.Then the iodine value,methylene blue value and the nitrogen adsorption/desorption isotherms of activated carbon were characterized.The results show that the obtained activated carbons have great mesoporous volume without impregnating additive.The mesoporous volume can reach 0.287 4 mL/g and its ratio is up to 72.43%;both of microporous and mesoporous volume increase about 0.05 mL/g with additive,suggesting that the additive can benefit for the micropore forming and promote the mesopore growth,increase the total volume;the pore size distribution can be modulated by impregnating different amout of additive.