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Science 25 October 2002:
Vol. 298. no. 5594, p. 699
DOI: 10.1126/science.298.5594.699n
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This Week in Science

Many industrial chemical reactions are catalyzed by small metal particles supported on oxide surfaces. Often these catalysts are deactivated by sintering, the agglomeration of smaller particles into larger ones at high temperatures, but the theoretical models for predicting sintering are either empirical or based on simplistic models for particle energetics. Campbell et al. (p. 811), using calorimetric data for lead particles on magnesium oxide, developed a model for metal nanoparticle energetics. They then apply this model to reproduce the distribution of gold nanoparticles on titanium oxide that they measured in ion scattering experiments. This model should prove useful in predicting long-term sinter rates of supported catalysts.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)