ENVR 123 |
| Zero-valent aluminum-based trimetallic particles comprising a combination of catalytically effective amounts (1wt%) of palladium and zero-valent iron on the aluminum surface were synthesized and tested for dechlorination of carbon tetrachloride in batch reactors. The XRD analysis indicated the trimetallic particles were present in zero-valent form of all three components. Trimetallic Pd-Fe-Al particles showed a very rapid degradation of 30 mg/L carbon tetrachloride leading to a surface-area-normalized rate constant (kSA) of approximately 0.01 L/h/m2, two orders-of-magnitude higher than that of reported data on zero-valent iron particles. Methane was the major product (>70%), chloroform was an intermediate and dichloromethane was found in a trace level (<2%). Repetitive addition of carbon tetrachloride showed no loss of activity of Pd-Fe-Al particles for more than 20 cycles. Hydrogen gas was generated and subsequently consumed during the reaction. This indicated an indirect reduction involving the formation of atomic hydrogen occurred. |
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General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Environmental Chemistry |