Abstract
The structural change during the supporting process of rhodium cluster [Rh 6(CO) 16] on Al 2O 3 has been studied by time-resolved energy-dispersive XAFS. With the increase of temperature, the bridging CO desorbs continuously at first and almost completely desorbs until 460 K. However, less than 20% terminal CO desorbs until 420 K. About 60% terminal CO desorbs between 420 and 500 K and remaining terminal CO desorbs above 500 K. The Rh Rh distance decreases from 0.277 to 0.268 nm suddenly between 470 and 490 K then gradually decreases to 0.264 nm. About a half Rh O interaction grew at the same temperature as the change of Rh Rh distance and remaining Rh O grows up above 490 K. The support of rhodium cluster on alumina is controlled by the desorption of bridging CO and the Rh Rh distance changes simultaneously.
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