Pore structure modification of spherical activated carbon and its effects on acetylene hydrochlorination

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;adsorption 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 150mL/min and N2 50mL/min,the spherical activated carbons after being immersed in 0.3% Fe(NO3) 3 were reactivated to generate pore size of 6nm,mesopore volume of 0.21cm3/g,and mesopore content of 36%.At the above activation gas flows,acetylene airspeed of 180h-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.