摘要
以石油焦为原料、KOH为活化剂,在不同的活化条件下制得系列超高比表面积活性炭(SBET>2500m2.g-1)样品。将实验制得的不同比表面积和孔分布的超高比表面积活性炭作为天然气吸附剂,测定了不同孔径范围孔所占的表面积与天然气脱附量的关系,讨论了孔分布对天然气脱附量的影响;用数学方法求得了活性炭吸附剂孔表面上单位表面积天然气的脱附量,并利用线性回归求出了天然气脱附量(V)与中孔表面积的关系。经相关性分析表明,天然气的脱附量与活性炭吸附剂中孔所具有的比表面积(Smid)具有显著的相关性,说明在活性炭吸附剂上天然气脱附量主要取决于中孔表面对天然气分子的吸附;求得中孔表面上单位表面积天然气脱附量达0.350mL.m-2,是微孔单位表面积上天然气脱附量的2倍以上;在各吸附温度、吸附压力下,天然气脱附量随活性炭吸附剂中孔表面积呈线性增加,满足线性方程:V=k.Smid+b。
The super-high specific surface area activated carbons （SBET 〉 2500m^2·g^-1） were prepared from petroleum coke using KOH as activation agent under different activation conditions. These prepared activated carbons, which possess different specific surface area and different pore size distribution, were used as natural gas adsorbent. The relation ship between natural gas desorption amount and the specific surface area of adsorbents was determined. The influence of pore size distribution on natural gas desorption amount was discussed by correlation coefficient. The natural gas desorption amount of unit surface area was acquired by mathematic methods. At the same time, the relationship between natural gas desorption amount and the specific surface area of mesopores was obtained, too. The results showed that the correlation coefficient of the natural gas desorption amount and mesoporous surface area （Smid） was higher than 0.903. It was that the natural gas desorption amount was mainly attributed to the adsorbed natural gas on mesoporous surface. The natural gas desorption amount on mesoporous surface reached 0. 350·L m ^-2, which was two times higher than that of micropores surface. Under different adsorption conditions, the natural gas desorption amount increase with the increment of the mesoporous surface area, and it abides to the linear equation： V= k·Smid ＋ b.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2006年第6期613-617,共5页
Acta Energiae Solaris Sinica
基金
中国科学院
重庆市科技成果孵化基金项目(002-7)
关键词
超高比表面积活性炭
吸附剂
天然气
脱附量
结构
super-high specific surface area activated carbon
adsorbent
natural gas
desorption amount
structure
