| 초록 |
The ethane decomposition over rubber, color and conductive carbon blacks(CBs) for CO2-free hydrogen production was performed. The ethane decomposition was carried out in a conventional fixed bed reactor under atmospheric pressure at 973-1173 K for 2 hours. The CBs were catalytically effective and stable for dehydrogenation of ethane to ethylene as well as subsequent decomposition of ethylene(C2H4→2C(s)+2H2). The higher was the specific surface area of the fresh CB, particularly for the nonporous rubber and color blacks, the higher catalytic activity was exhibited. Although the specific surface area of the whole carbon(fresh CB + deposited carbon) decreased with increase of WC(= g deposited carbon/g fresh CB), the total surface area of the whole carbon in the reactor increased up to 2-3 times with increase of WC up to 0.6-1.5 and then decreased. The difference between the rubber and conductive blacks is considered due to the different structure of them. Changes of surface morphology of the carbon blacks with increasing WC were observed by TEM and SEM. The mechanisms of non-catalytic thermal decomposition and catalytic decomposition were proposed based on the analyzed results. |
