Highly dispersive PdCoB catalysts for dechlorination of chlorophenols.
Highly dispersive PdCoB nano-particles were prepared by precipitation-reduction with NaBH4 at 273 K. Characterization showed that the dispersion of amorphous alloy PdCoB nano-particles increased with decrease in both Pd/Co ratio and preparation temperature. The size of PdCoB-L(273) (Pd/Co ratio of 0.0005) nano-particles prepared at 273 K was 5 nm and BET specific surface area was estimated to be 177 m(2)/g, much higher than those of bimetallic catalysts reported in literature. During the hydrodechlorination of 4-chlorophenol, PdCoB catalysts were effective within pH range from 2.5 to 11. The activity of PdCoB can be promoted by the increase in B/Co ratio on the surface. PdCoB-L(273) sample presented the highest efficiency, and the reaction constants described in different terms for 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol were much higher than those obtained over PdFe in literature, probably ascribed to smaller particle sizes, less agglomerations and strong synergistic effect between Pd, Co and B species.
Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, PR China.
Xuchen
X
Liu
Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, PR China. Electronic address: wangxy@ecust.edu.cn.
Xingyi
X
Wang
D001895:Boron / Q000737:chemistry*; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry; D002733:Chlorophenols / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification
D002733:Chlorophenols; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol; D003035:Cobalt; D002713:Chlorine; D010165:Palladium; C024564:2,4,6-trichlorophenol; D001895:Boron; C004762:2,4-dichlorophenol
Chlorophenols; Hydrodechlorination; Nano-particles; PdCoB