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Catalytic Decomposition of CFC-12 over Solid Superacid Mo2O3/ZrO2 |
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| Authors: | Ping Ning Xiangyu Wang Hans-J?rg Bart Tiancheng Liu Jun Huang Yaming Wang Hong Gao |
| Affiliation: | 1Professor, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, 650093 Kunming, China (corresponding author). E-mail: ningping_58@sina.com 2Professor, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, 650093 Kunming, China. E-mail: wxy_hit2007@126.com 3Professor, Lehrstuhl für Thermische Verfahrenstechnik, TU Kaiserslautern, D-67653 Kaiserslautern, Germany. 4Ph.D. Student, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, 650093 Kunming, China. 5Ph.D. Student, Faculty of Chemical Engineering, Kunming Univ. of Science and Technology, 650224 Kunming, China. |
| Abstract: | Catalytic decomposition of dichlorodifluoromethane (CFC-12) in the presence of water vapor and oxygen was studied over a series of solid superacids, Mo2O3/ZrO2, that had different ZrO2 content by using a fixed-bed reactor. CO2 and CClF3 were the main products and no CO was detected as by-product. The decomposition activity of solid superacid largely depended on the content of ZrO2 and the calcination temperatures of Mo2O3/ZrO2. The optimal calcination temperature and content of ZrO2 for preparing Mo2O3/ZrO2 with the highest activity for catalytic decomposition of CFC-12 were 450°C and 20–40% by weight, respectively. Adopting a low concentration of oxygen and CFC-12 together with a high concentration of water vapor was preferable for having the high conversion efficiency of CFC-12 and the selectivity for CO2. The catalytic activity of Mo2O3/ZrO2 remained steady for 100?h in continuous operation. |
| Keywords: | Decomposition Acids Pollutants Gas Oxygen |