Abstract
The number of active oxygen species (O s) on the surface of Cr 2O 3 catalysts was determined by using the rectangular pulse technique coupled with the reaction of NH 3 with a preoxidized catalyst, i.e., 2 NH 3 + 3O s → N 2 + 3H 2O and 2NH 3 + 4O s → N 2O + 3H 2O. The observed number of active oxygen species was found not to change with experimental variables such as temperature, carrier gas flow rate, weight of catalyst, and pulse width. The area occupied by a site, which is defined as the BET surface area divided by the number of active oxygen species, was almost constant for three kinds of Cr 2O 3 catalysts prepared by different methods, and it was close to literature data.
Published Version
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