炭化对活性炭孔结构及甲烷吸附性能的影响

INFLUENCE OF CARBONIZATION ON PORE STRUCTURE AND METHANE ADSORPTION BEHAVIOR OF ACTIVATED CARBON

在惰性气氛下对以石油焦为原料 ,以 KOH为活化剂制得的超级活性炭进行了二次炭化处理 ,并考察了处理前后超级活性炭的孔结构变化及不同压力下该活性炭对甲烷的吸附行为 .结果发现 :活性炭经 1 2 0 0℃下二次炭化处理后其 BET比表面积及孔容有所下降 ,孔径分布变窄 ;其对甲烷的质量吸附量下降 ,对甲烷的体积吸附量在较低压力下 ( <3MPa)稍有增加 ,而在较高压力下 ( >3MPa)

The influence of post carbonization on pore structure and methane adsorption behavior of high surface area activated carbon (HSAC) was investigated. The results showed that the BET surface area and pore volume decreased after post carbonization, and pore distribution became narrow. The gravimetrical adsorption capacity of HSAC decreased during whole pressure range, while the volumetric adsorption capacity increased at low pressure (<3 MPa) and decreased at high pressure (>3 MPa) after post carbonization.\;