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Supported bimetallic Pd-Rh catalysts were prepared using the impregnation method. The effects of the active components content and the carrier on the catalytic activity of the bimetallic Pd-Rh catalysts were investigated with 4-fluorophenol (4-FP) as the representative fluorinated organic compounds (FOCs). The results showed that the presence of Rh significantly enhanced their catalytic activity for the hydrodefluorination (HDF) of 4-FP, and 2% Pd-1% Rh/AC exhibited good catalytic activity for the HDF of 4-FP, and the conversion of 4-FP over 2% Pd-1% Rh/AC reached 95.62% within 90min. Furthermore, the type of the carrier played a significant role on the catalytic activity of bimetallic Pd-Rh catalysts. 2%Pd-1%Rh/CB exhibited the highest catalytic activity for the HDF of 4-FP when carbon black (CB) was used as a carrier, and thus the complete HDF of 4-FP was achieved within 80min. Catalyst characterization (BET, ICP-MS, RS, TEM, and XPS) indicated that the carriers with more surface defects favored the catalysts exhibited higher catalytic activity, which in turn enabled 2%Pd-1%Rh/CB and 2%Pd-1%Rh/CNTs to exhibit higher catalytic activity for the HDF of 4-FP. Moreover, 2%Pd-1%Rh/CB possessed more Pd0, which is more conducive to the activation of the H2, and in turn promoted catalytic HDF of 4-FP. Thus, 2%Pd-1%Rh/CB possessed the highest catalytic activity for the HDF of 4-FP.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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