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15
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0043282760
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note
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After heating in He to the desired temperature, the reaction gas mixture was introduced in a flow microreactor that contained a packed-bed of catalyst particles (<50 μm in size). Rates were measured for 2 hours at each temperature, and only steady-state data are reported. Measurements were conducted with the same catalyst charge in descending temperature mode; upon completion of the series of runs, the rate was measured again at 300°C. The new value was within 5% of the initial rate at this temperature.
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16
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0041779524
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note
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Materials and methods are available as supporting material on Science Online.
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17
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0043282755
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note
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Initial- and final-state effects on the binding energy of Au clusters on ceria are not available in the literature. Generally, final-state effects cause a positive shift of the binding energy of metallic nanoparticles as their size is decreased (18), but below a certain cluster size (∼2 nm), initial-state effects prevail (19), causing negative binding energy shifts. Therefore, extensive compensation effects are possible. The observed minor, positive energy shift may be due to partially oxidized Au clusters.
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20
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0000514421
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24
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0042280467
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note
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3/ min (NTP)] was passed over the sample, which was heated at 5°C per min to 900°C. The effluent gas was analyzed by mass spectrometry (MKS model RS-1). The cyclic CO-TPR experiments were conducted only up to 400°C to avoid structural changes in the catalyst at higher temperatures.
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25
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0042280466
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note
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2 calcined at 800°C (Table 1). These values will increase if Au or Pt ions substitute in the ceria lattice.
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27
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0012283764
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J. R. McBride, K. C. Hass, B. D. Poindexter, W. H. Weber, J. Appl. Phys. 76, 2435 (1994).
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0041779526
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note
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We gratefully acknowledge the suport of this work by the National Science Foundation and the U.S. Environmental Protection Agency, under grant no. CTS 9985305.
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