Development of a catalytic decomposition system for chlorofluorocarbons

✍ Scribed by Shuichi Kanno; Shin Tamata; Hisao Yamashita; Shigeru Azuhata

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 373 KB
• Volume: 132
• Category: Article
• ISSN: 0424-7760
• DOI: 10.1002/(sici)1520-6416(20000715)132:1<57::aid-eej8>3.0.co;2-4

✦ Synopsis

It is becoming increasingly important to decompose chlorofluorocarbons (CFC), which destroy the ozone layer. The purpose of this study is to investigate the CFC decomposition activities of a catalyst and a decomposition system. CFC decomposition with H 2 O by KI-100 catalyst, a TiO 2based catalyst which we have developed, was investigated. KI-100 catalyst showed high activity for CFC11, CFC12, and CFC113 decomposition. However, the conversion rate CFC113 decreased with time and was 70% after 1000 h. In order to determine the cause, the KI-100 catalyst was analyzed. From the results of quantitative analyses, it was found that the weight of TiO 2 in the catalyst decreased from 11.42 g to 1.09 g (90.5 wt%) and TiO 2 changed to TiOF 2 . To prevent the formation of TiOF 2 , another component, which was less reactive with CFC than TiO 2 , was applied to the catalyst surface. The improved catalyst, KI-1000, showed long durability for CFC12 decomposition and the conversion rate was above 99.99% over 2000 h. Based on these results, we have commercialized Catalytic Decomposition Equipment for CFCs.