Abstract
It is becoming increasingly important to decompose chlorofluorocarbon (CFC) which destruct ozone layer. The purpose of this study is to investigate CFC decomposition activities of catalyst and a decomposition system. CFC decomposition activities with H2O by KI-100 catalyst which we have developed a TiO2-based catalyst was investigated. KI-100 catalyst showed high activity for CFC11, CFC12 and CFC113 decomposition. However, the conversion rate for CFC113 was decreased with time and was 70% after 1000h. In order to clear the reason, the KI-100 catalyst was analyzed. From the results of quantitative analyses, it was found that a weight of TiO2 in the catalyst was decreased from 11.42g to 1.09g (-90.5wt%) and TiO2 changed to TiOF2. To prevent the formation of TiOF2, the other component, which was less reactive with CFC than TiO2, was coated over the catalyst surface. The improved catalyst, KI-1000, showed long durability for CFC12 decomposition and the conversion rate was above 99.99% over 2000h. Based on these results, we commercialized “Catalytic Decomposition Equipment of CFC”.
