通过对市售球形活性炭浸渍 Fe(NO3)3进行CO2二次活化,使用不同活化条件制备得到具有不同孔径分布的球形活性炭,并研究了所制备的样品在乙炔氢氯化反应中的活性。利用扫描电镜(SEM)观察了样品表面形貌,采用BET法测试了样品改性前后孔道结构的变化,使用程序升温脱附(TPD)分析了样品改性前后吸附性能的变化,使用固定床装置对样品在乙炔氢氯化反应中的催化性能进行了测试。实验结果表明,球形活性炭通过浸渍0.3%的 Fe(NO3)3,活化气体流量为 CO2150 mL/min、N250 mL/min 时,二次活化能够将孔径扩大至6 nm、中孔孔容达到0.21 cm3/g、中孔含量为36%。将上述活化气体流量的样品用于乙炔氢氯化反应中,当反应条件为乙炔空速180 h-1、温度180℃、n(HCl)∶n(C2 H2)=1.05~1.1时,其初始转化率达到30%(比市售球形活性炭提高100%)。
Commercial spherical activated carbon was reactivated in CO2 after being immersed in Fe(NO3 )3 . samples with different pore size distributions were prepared under different activation conditions,and their effects on acetylene hydrochlorination were investigated.The surface morphology of samples was observed by scanning electron microscopy (SEM);pore structures before and after modification were tested by BET;ad-sorption performances before and after modification were analyzed by temperature programmed desorption (TPD);the catalytic performances in acetylene hydrochlorination were investigated on a fixed bed reactor.The results show that at CO2 150 mL/min and N2 50 mL/min,the spherical activated carbons after being immersed in 0.3% Fe(NO3 )3 were reactivated to generate pore size of 6 nm,mesopore volume of 0.21 cm3/g,and meso-pore content of 36%.At the above activation gas flows,acetylene airspeed of 180 h-1 ,180 ℃,and n(HCl)∶n(C2 H2)=1.05-1.1,the samples were used in acetylene hydrochlorination,and reached an initial conversion rate of 30%,which was 100% higher the commercial spherical activated carbon.
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