Abstract
Spontaneous dispersion and clustering processes of Pd were measured by means of energy-dispersive XAFS. The spontaneous dispersion of bulky metal Pd into highly dispersed PdO was directly observed on the H-type zeolite in the atmosphere of O2. Various clustering processes of metal Pd was observed over different kind of zeolite supports. The selective formation of Pd6 and Pd13 clusters were found over H-ZSM-5, H-Mordenite and H-Y supports, respectively. It was concluded that the crystal structure and acid sites of zeolites had significant influences on the dynamic behavior and the genesis of Pd clusters.
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