Reaction-Induced Cluster Ripening and Initial Size-Dependent Reaction Rates for CO Oxidation on Ptn/TiO2(110)-(1×1)
Journal of the American Chemical Society2014Vol. 136(24), pp. 8702–8707
Citations Over TimeTop 10% of 2014 papers
Abstract
We determined the CO oxidation rates for size-selected Ptn (n ∈ {3,7,10}) clusters deposited onto TiO2(110). In addition, we investigated the cluster morphologies and their mean sizes before and after the reaction. While the clusters are fairly stable upon annealing in ultrahigh vacuum up to 600 K, increasing the temperature while adsorbing either one of the two reactants leads to ripening already from 430 K on. This coarsening is even more pronounced when both reactants are dosed simultaneously, i.e., running the CO oxidation reaction. Since the ripening depends on the size initially deposited, there is nevertheless a size effect; the catalytic activity decreases monotonically with increasing initial cluster size.
Related Papers
- → Impact of Oil Type on Nanoemulsion Formation and Ostwald Ripening Stability(2008)814 cited
- → Modeling the Competition between Polymorphic Phases: Highlights on the Effect of Ostwald Ripening(2016)21 cited
- → Ostwald Ripening in Rarefied Systems(2006)20 cited
- → Ostwald ripening of crystalline precipitates in aqueous solutions at constant temperature and periodic temperature changes(1972)23 cited
- → Theory of Ostwald Ripening(1988)10 cited