| 초록 |
The redox catalytic properties of carbons have been investigated due to fundamental interest and possible practical applications. Although various carbons are available, the effects of nanostructures on their redox properties have not been understood. Herein, the redox catalytic properties and stability of sixteen carbons were investigated using oxidative dehydrogenation as a model reaction. The result showed that overall activity increased with increasing content of C=O active sites. However, with increasing C=O content, the activity per site gradually decreased, while the alkene selectivity increased due to the lower reducibility of C=O site. Since more C=O sites are present in a less stable edge sites, the carbons generally showed a trade-off relationship between activity and stability. However, graphitic carbon with ‘coin-stacking’ carbon layers showed exceptionally high activity and stability due to the unique structure that simultaneously provides high graphitic order and abundant edge sites. |
