Mercaptosilane-assisted synthesis of metal clusters within zeolites and catalytic consequences of encapsulation.
作者： Minkee Choi , Zhijie Wu , Enrique Iglesia
DOI: 10.1021/JA102778E
关键词:
摘要: We report here a general synthetic strategy to encapsulate metal clusters within zeolites during their hydrothermal crystallization. Precursors are stabilized against premature colloidal precipitation as hydroxides zeolite crystallization using bifunctional (3-mercaptopropyl)trimethoxysilane ligands. Mercapto (−SH) groups in these ligands interact with cationic centers, while alkoxysilane moieties form covalent Si−O−Si or Si−O−Al linkages that promote nucleation around ligated precursors. These protocols led the successful encapsulation of Pt, Pd, Ir, Rh, and Ag NaA zeolite, for which small channel apertures (0.41 nm) preclude postsynthesis deposition clusters. Sequential treatments O2 H2 formed (∼1 uniform diameter. Titration exposed atoms gave dispersions agree well mean cluster sizes measured from electron microscopy X-ray absorption spectroscopy, consis...
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