Article
Unsupported Molybdenum Carbide and Nitride Catalysts for Polychlorinated Biphenyls Hydrodechlorination
Registro en:
Catalysis Letters
1011-372X
Autor
Del Toro, Raquel
Minichini, Marian
Brito, Joaquín L.
Betancourt, Paulino
Institución
Resumen
Unsupported Mo carbide and Mo nitride catalysts
have been synthesized by temperature programmed
synthesis, and characterized by X-ray diffraction, X-ray
photoelectron spectroscopy, H2-temperature programmed
reduction and desorption and N2 physisorption. These solid
compounds have been tested for the hydrodechlorination
(HDCl) of polychlorinated biphenyls (PCBs) at 1 bar in a
fixed bed reactor. The Mo carbides and the corresponding
Mo nitride phases showed a catalytic activity higher than a
conventional HDS catalyst consisting of alumina-supported
NiMo sulfides (*35 %). Aroclor 1260 HDCl conversion
results were related to spilt-over hydrogen species that were
proposed to favor the hydrogenolysis of C–Cl bond on
refractory phases. The original PCBs broad distribution
changed almost completely to non-chlorinated biphenyl on
the carbide and nitride catalysts. FONACIT G-2005000444, G-200000153
PDVSA-Intevep 2005-00051/2005-023