Abstract
The oxidation of propene by nitrous oxide has been studied in detail on Pt/SiO 2 of widely varying dispersion with respect to catalytic oscillations at 160 -3 50° C, using a tubular flow reactor under atmospheric pressure. The partial and complete oxidations occurred in parallel on two different active sites, and the catalytic oscillation appeared only in the partial oxidation to form propanal. The turnover frequency (TOF), selectivity and period of oscillation for propanal formation were significantly varied depending on the percentage of platinum surface exposed exhibiting a strong structure sensitive oscillation. As a possible trigger inducing the oscillation, the surface coverage fluctuation of weakly adsorbed propene was reasonably considered because of its actual oscillatory behavior of surface coverage from θ=0.07 to 0.28 synchronizing with the propene oscillation.
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