Decomposition of chlorofluorocarbons in the presence of water over zeolite catalyst期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Decomposition of chlorofluorocarbons in the presence of water over zeolite catalyst

Authors:	Masahiro Tajima Miki Niwa Yasushi Fujii Yutaka Koinuma Reiji Aizawa Satoshi Kushiyama Satoru Kobayashi Koichi Mizuno and Hideo Ohu chi

Affiliation:	^aDepartment of Materials Science, Faculty of Engineering, Tottori University, Koyama, Tottori , 680,Japan ^bTosoh Corp., Shin-nanyou, Yamaguchi 746, Japan ^cNational Institute for Resources and Environment, Agency of Industrial Science and Technology, Onogawa, Tsukuba, Tharaki 305, Japan

Abstract:	The decomposition of chlorofluorocarbons (CFCs) in the presence of water was examined over a variety of solid acid catalysts. More than 40% of the conversion of CFC was observed on HY zeolite, H-mordenite, H-ZSM-5, γ-Al₂O₃, and SiO₂TiO₂ catalysts, and the selectivity to CO and CO₂ was nearly 100% except on γ-Al₂O₃. Although the H-mordenite had the highest activity among the tested catalysts, it was gradually deactivated during the reaction due to the elimination of Al atoms from the zeolite framework. A good relationship was found between the reactivity on H-mordenite and the bond energy of CCl in compounds of CCl₄, CCl₃F, CCl₂F₂, and CClF₃, suggesting that the rate controlling step was the cleavage of the CCl bond.

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