Hydrodechlorination of 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) over supported ruthenium and other noble metal catalysts

被引：30
作者：
Mori, T [1 ]
Yasuoka, T [1 ]
Morikawa, Y [1 ]
机构：
[1] Tokyo Inst Technol, Chem REsources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
来源：
CATALYSIS TODAY | 2004年 / 88卷 / 3-4期
关键词：
hydrodechlorination; trichlorotrifluoroethane; chlorofluorocarbon; Ru catalyst; noble metal catalyst;
D O I：
10.1016/j.cattod.2003.11.004
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The hydrodechlorination of CCl2F-CClF2 (CFC-113) was studied using silica- and activated carbon-supported Ru, Rh, Pd, and Pt catalysts. The activity of the catalysts changed with time-on-stream. Ru was most stable among the four noble metals and gave a simple product distribution yielding CClF=CF2 (CFC-1113) and CHClF-CClF2 (HCFC-123a) as main products. Over silica- supported Ru, CFC-1113 yield decreased gradually with time-on-stream but HCFC-123a yield did not change throughout the reaction, suggesting that these products were formed on different sites of Ru. XRD studies and temperature-programmed reduction of the spent catalyst revealed that the deactivation was caused by halogen-containing carbonaceous species accumulated on the Ru surface during the reaction. The carbonaceous species seemed to be formed on the active site for CFC-1113 formation. Because CFC-1113 selectivity was higher over the catalyst having higher Ru dispersion, it was assumed that the hydrodechlorination of CFC-113 is structure-sensitive and CFC-1113 formation is promoted by Ru having highly unsaturated coordination sphere. (C) 2003 Elsevier B.V. All rights reserved.
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页码：111 / 120
页数：10
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