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Cluster size effects on oxidation activity, adsorbate affinity, and temporal behavior of model catalysts
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Image of FIG. 1.
FIG. 1.

evolution during a sequence of pulses of intensity.

Image of FIG. 2.
FIG. 2.

Comparison of the signal from the first pulse on -pre-dosed and .

Image of FIG. 3.
FIG. 3.

Comparison of the oxidation activity for .

Image of FIG. 4.
FIG. 4.

(Bottom) ISS for as-deposited . (Middle) ISS after exposure to of . (Top) ISS after exposure followed by exposure to pulses.

Image of FIG. 5.
FIG. 5.

The rutile surface, in top and perspective views. Small black balls are titanium atoms, dark gray balls are bridging oxygen atoms, and light gray balls are oxygen atoms. Two oxygen vacancies are shown, circled in the top view.

Image of FIG. 6.
FIG. 6.

Comparison of ISS ratios for as-deposited (left scale) to oxidation activity (right scale).

Image of FIG. 7.
FIG. 7.

Effects on production of annealing an sample to the indicated temperatures prior to exposure and pulsing.

Image of FIG. 8.
FIG. 8.

Effects of exposure on the intensity of ISS peaks for , and , relative to their pre-exposure intensities (left scale). Also shown (right scale) is the oxidation activity.

Image of FIG. 9.
FIG. 9.

Effects of exposure on the and intensities, relative to the pre-exposure intensities.

Image of FIG. 10.
FIG. 10.

Correlation of oxidation activity (right scale) with the -induced attenuation of signal (left scale, inverted).

Image of FIG. 11.
FIG. 11.

Comparison of 1st pulse pulse shapes for different cluster size samples.


Generic image for table
Table I.

production parameters.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Cluster size effects on CO oxidation activity, adsorbate affinity, and temporal behavior of model Aun∕TiO2 catalysts