The performances of a Cu-V-K catalyst in the oxidn. of soot collected in a methane-rich flame were studied in a tubular flow reactor. Burn-off temps. were lowered by 300 K with respect to uncatalyzed combustion. The dependence of the reaction rate on the relevant variables gas was investigated. The apparent activation energy for the catalytic oxidn. was about a half of the one of the uncatalyzed process, while the C reactivity showed a linear dependence on the initial soot to catalyst mass ratio. A square root dependence on the O partial pressure was found. The results of soot combustion confirm previous findings obtained with other C materials. Moreover, kinetic data follow a model proposed for the catalytic combustion of amorphous C black. An extension of this model, incorporating the influence of carbon-catalyst contact on the catalyst performances, is presented.
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