Probing the Thermal Stability of (3-Mercaptopropyl)-trimethoxysilane-Protected Au25 Clusters by In Situ Transmission Electron Microscopy.
作者： Robert W. J. Scott , Charles Soong , Stas Dogel , Veeranmaril Sudheeshkumar
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摘要: High-surface-area gold catalysts are promising for a number of selective oxidation and reduction reactions but typically suffer catalyst deactivation at higher temperatures. The major reason deactivation is sintering, which can be triggered via two mechanisms: particle migration coalescence, Ostwald ripening. Herein, direct method to synthesize Au25 clusters stabilized with 3-mercaptopropyltrimethoxysilane (MPTS) ligands discussed. sintering (MPTS)18 on mesoporous silica (SBA-15) monitored by using an environmental in situ transmission electron microscopy (TEM) technique. Results show that agglomeration smaller particles accelerated increased mobility during heat treatment, while growth immobile occurs diffusion atomic species from particles. the Au alleviated fabricating overlayers around clusters. resulting materials tremendous sinter-resistance at temperatures up 650 °C as shown TEM extended X-ray absorption fine structure analysis.
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