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Development of a catalytic decomposition system for chlorofluorocarbons
Author(s) -
Kanno Shuichi,
Tamata Shin,
Yamashita Hisao,
Azuhata Shigeru
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(20000715)132:1<57::aid-eej8>3.0.co;2-4
Subject(s) - catalysis , decomposition , chemistry , chemical decomposition , materials science , chemical engineering , organic chemistry , engineering
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 2 ‐based 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. © 2000 Scripta Technica, Electr Eng Jpn, 132(1): 57–63, 2000