| 초록 |
NiK/CexZr1-xO2 and NiK/CexZr1-xO2-Al2O3 catalysts are synthesized in order to investigate the effect of interaction between Ni metal and supports containing high oxygen storage capacity to vacuum residue oxidative cracking. In the reaction results, high conversion and liquid yields were achieved through various active sites over the catalysts, compared to thermal cracking. Steam decomposition occurring over CeO2, CexZr1-xO2 and ZrO2 phases of the supports provided an alternative hydrogen source for hydrogenation and oxygen source for oxidative cracking. The formation of CexZr1-xO2 phase and the existence of alumina enhanced the catalytic performance by supplying active sites for oxidative cracking and acid sites for catalytic cracking, respectively. The NiK addition significantly improved the quality of liquid products by the hydrogenation over nickel metallic sites. Moreover, more CO2 gas was produced after the NiK addition, caused by not steam reforming on the Ni metallic phase but the enhancement of oxidative cracking by the metal support interaction due to the NiK addition. |
