Abstract
Research on homogeneous and heterogeneous catalysis is indeed convergent and finds subnanometric particles to be at the heart of catalytically active species. Here, monodisperse gold clusters are deposited from the gas phase onto porous titania generating well-defined model systems and the resulting composite materials exhibit a sharp size-dependency on the number of gold atoms per cluster and exceptionally high-turnovers toward the bromination of 1,4-dimethoxybenzene are observed. This indicates that the deliberate generation of active centres is of utmost importance for the creation of the most "gold-efficient" catalysts.
Highlights
In 19851/872 first subtle clues were found that gold presents an element as valuable for chemists as for jewellers
Monodisperse gold clusters are deposited from the gas phase onto porous titania generating well-defined model systems and the resulting composite materials exhibit a sharp size-dependency on the number of gold atoms per cluster and exceptionally highturnovers toward the bromination of 1,4-dimethoxybenzene are observed
The particle size of titania crystallites is determined from the analysis of peak-broadening of the signals obtained by powder X-ray diffraction (PXRD, see Fig. 2) using the Scherrer-method
Summary
In 19851/872 first subtle clues were found that gold presents an element as valuable for chemists as for jewellers. Size-selected gold clusters on porous titania as the most ‘‘gold-efficient’’ heterogeneous catalysts
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