微孔结构与表面改性对活性炭吸附储氢能力的影响

研究了椰壳基活性炭微孔结构和化学改性对其储氢能力的影响。结果表明,物理活化的椰壳基活性炭用HF或NH3.H2O处理后可提高活性炭的吸氢能力,用HNO3处理后吸氢能力几乎没有什么变化,而用H3PO4处理后吸氢能力却有明显的下降。活性炭的比表面积、孔径分布和表面性质都会影响其吸附氢气的能力,其中,比表面积是最主要的影响因素。

Effect of microstructure and surface modification on the hydrogen adsorption capacity of active carbons

The effect of the microstructure of coconut-shell-based activated carbons, and their treatment with chemicals, on hydrogen adsorption capacity was studied. Active carbons from coconut shells using physical activation could be improved for hydrogen adsorption by treatment with HF or NH3 ·H2O. Treatment with HNO3 had no obvious effect and the treatment with H3PO4 lowered the hydrogen adsorption capacity considerably. All of the effects could be accounted for by changes in the specific surface area, pore size distribution, and surface chemistry of the active carbons. The specific surface area of carbons was the dominant factor for hydrogen adsorption no matter what kind of treatment was performed.