본 연구에서는 $SF_6$ 가수분해를 위하여 사용되는 ${gamma}-Al_2O_3$의 안정성을 개선하기 위하여 조촉매를 조사하였다. $SF_6$의 가수분해과정에서 ${gamma}-Al_2O_3$의 결정상은 ${alpha}$상으로 전환된다. 여러 가지 금속산화물이 조촉매로 적용되었으며, 1, 5, 10 wt%의 Ga, Mg, Zn가 함침법에 의해서 ${gamma}-Al_2O_3$의 표면에 담지 되었다. 특히, 산화아연이 담지된 촉매가 높은 활성을 가지고 이들의 결정상 변화가 없음을 촉매활성실험과 XRD분석으로 확인되었다. 이들 결과로부터 $SF_6$의 촉매분해반응에서 ZnO를 촉매의 표면에 담지하여 ${gamma}-Al_2O_3$의 촉매적 안정성이 향상됨을 알 수 있었다.
In order to improve the stability of ${gamma}-Al_2O_3$ on hydrolysis of $SF_6$, the catalytic promoters were investigated in this study. The crystal phase of ${gamma}-Al_2O_3$ is transformed to their ${alpha}$-phase during hydrolysis of $SF_6$. Various metal oxides were applied as the promoter material that is Ga, Mg, and Zn and the promoter of 1, 5, and 10 wt% was impregnated over ${gamma}-Al_2O_3$ by the impregnation method. Specially, it were confirmed in the catalytic activity tests and XRD analysis that ZnO/${gamma}-Al_2O_3$ catalyst had the high activity for decomposition of $SF_6$ by catalytic hydrolysis and the crystal phase of ZnO promoted ${gamma}-Al_2O_3$ was not transformed. From these results, it could be known that the stability of ${gamma}-Al_2O_3$ is enhanced with the catalytic promotion of ZnO impregnated over the surface of catalyst.
