Metal catalysts impregnated on porous media for aqueous phenol decomposition within three-phase fluidized-bed reactor

摘要

Performance of metal catalysts to decompose aqueous phenol was experimentally investigated. Comparison of the phenol decomposition rates within three-phase fluidized-bed reactors utilizing only O_3, TiO_2 deposited on silica beads, metal catalyst (Ni or Co) impregnated on mesoporous carbon beads, or Ch in combination with each catalyst was thoroughly examined. It was found that the use of Co catalyst with the presence of O_3 led to the best removal condition which aqueous phenol was completely decomposed within lOmin (k = 0.1944min~(-1)). In contrast, the use of HO_2 without O_3 resulted in the worst decomposition of phenol (k = 0.0066min~(-1)). Some intermediate products, such as hydroquinone and catechol, were also detected but their final concentrations were negligibly low.