窄分布微孔活性炭的制备

Preparation of Coal-Based Activated Carbon with Narrow Pore Size Distribution

研究了一种制备窄分布微孔活性炭的新工艺,该工艺采用氧化性复合添加剂处理原料,添加剂的添加量为煤量的7％～10％.将添加剂与煤粉和焦油混合挤成条,然后按常规工艺炭化和活化,制成的活性炭微孔发达,微孔孔容达天0.44～0.64 mL/g以上,孔径分布集中,80％～90％的孔隙半径在0.4～0.8 nm范围内.随着烧失率的提高,微孔孔容增加,且主要是在0.4～0.8 nm范围内.在添加剂作用下,T煤更适合于制备微孔活性炭.在复合添加剂的3种组分中,硝酸钾有利于微孔的比例增大.原料的灰分对添加剂作用的发挥有负面影响,不利于孔隙的发展.

A new process for preparing activated carbons, in which a composite additive was used, was developed. The amount of additive is in the range of 7%-10% of the coal. The additive and coal powder were mixed with tar to form a paste which was extruded into round strip. The traditional process was used for carbonization and activation of the strip. The resulting carbons are microporous and the micropore volume is up to 0. 44-0. 64 mL/g. The pore size distribution is narrow and the pores within o. 4-0. 8 nm account for 80%-90% of the total. Coal T is more suitable than coal J for preparation of microporous activated carbon in the presence of the additive. KNO3 in the composite additive is favorable to the development of micropore. The ash in the coal samples affects negatively the performance of the additive.