Role of Sn in the Regeneration of Pt/γ-Al2O3 Light Alkane Dehydrogenation Catalysts
作者： Hien N. Pham , Jesper J. H. B. Sattler , Bert M. Weckhuysen , Abhaya K. Datye
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摘要: Alumina-supported Pt is one of the major industrial catalysts for light alkane dehydrogenation. This catalyst loses activity during reaction, with coke formation often considered as reason deactivation. As we show in this study, amount and nature carbon deposits do not directly correlate loss activity. Rather, it transformation subnanometer species into larger nanoparticles that appears to be responsible catalytic Surprisingly, a portion Sn remains atomically dispersed on alumina surface spent helps redispersion Pt. In absence support, formed reaction are redispersed oxidative regeneration. It known added promoter help achieving high propene selectivity minimize formation. work shows an important role regeneration Pt, by providing nucleation sites surface. Aberration-corrected scanning transmission electron microscopy provide unique insights operating characteristics industrially demonstrating elements, such Sn, γ-Al2O3.
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