中间相沥青的调制对纳米级微孔超高表面积活性炭性能的影响

Effect of modification of mesophase pitches on performance of ultra-high surface area activated carbons with nanometer level micropore

以中间相沥青为原料,采用KOH活化制取了超高表面积活性炭,其比表面积高达3464m2/g,总孔容积高达2 14cm3/g,碘吸附值为3094mg/g,苯吸附值为1610mg/g.所制活性炭富含发达的微孔,其孔径主要集中在1～4nm范围内,具有优异的吸附性能.研究了中间相沥青调制对纳米级微孔超高表面积活性炭性能的影响,结果表明.制备中间相沥青所用原料的净化处理是制备超高表面积活性炭的关键,以1～2℃/min升至400℃并保温2～3h所得中间相沥青制取的活性炭具有极高的吸附性能,中间相沥青炭物料的碳质微晶结构对超高表面积活性炭制取起着决定性作用.

With mesophase pitches as raw materials, ultra-high surface area activated carbons were prepared by KOH activation. The specific surface area and total pore volume of activated carbons were as high as 3 464 m^2/g and 2.14 cm^3/g, respectively. The iodine and benzene adsorption capacity of the resultant carbons were 3 094 mg/g and 1 610 mg/g respectively. It was found that the prepared activated carbons were rich in the micropores. The micropore sizes ranged from 1nm to 4nm.The prepared activated carbon had excellent adsorption properties. The effects of the modification of mesopase pitches on the performance of ultra-high surface area activated carbons with nanometer level micropore were studied. The results show that the purification treatments of mesophase pitch precursors are the key to the manufacture of ultra-high surface area activated carbons. The activated carbon prepared under the carbonization conditions(temperature:400 ℃;heating rate:1-2 ℃/min and soaking time:2-3 h) has the highest adsorption capacity. It is confirmed that the carbonaceous crystallites in the mesophase pitches play an important role in the preparation of ultra-high surface area activated carbons.