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Abstract
X-ray diffraction was used to determine the changes in particle size distribution of silica-supported platinum particles following treatments in reactive (C 23H 4 + O 2) and nonreactive control (O 2, CO 2, H 2O, C 2H 4) atmospheres for varying lengths of time at 600 °C. The nature of the observed changes for reactive atmosphere-treated samples was very different from that for control atmosphere-treated samples. Modeling work indicated that the changes in the particle size distribution found following treatment in any nonreactive atmosphere were consistent with particle growth by coalescence, whereas under reaction conditions changes in the particle size distribution were consistent with growth by atomic migration. It is suggested that under reaction conditions the sintering process is dominated by the formation of volatile, metastable platinum containing intermediates which form via the interaction of homogeneously formed radicals with supported platinum particles.
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