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On the Role of Sn Segregation of Pt-Sn Catalysts for ...

This paper describes the structure evolution of Pt-Sn bimetallic nanoparticles for catalytic dehydrogenation, especially Sn segregation for surface recovery of a Pt-Sn alloy. An acid etching-reduction process was adopted to investigate the migration of Sn atoms after surface Sn species loss. By acid etching, Sn atoms at the surface of Pt-Sn ...

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1165 pt sn Fuel 875 Кб The second peak at about 750 K matches with tin reduction temperatures and suggests that there is still some unalloyed tin in the catalyst. 1158 M. Chiappero et al. / Fuel 90 (2011) 1155– 1165 PtSn/SiO2...

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ACS Catal. :

。,,。Pt,,。Pt(111)Pt(100) …

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Pt–Sn alloy phases and coke mobility over Pt–Sn/Al2O3 …

Propane dehydrogenation on Pt–Sn/Al 2 O 3 and Pt–Sn/ZnAl 2 O 4 was performed, and the Pt–Sn/ZnAl 2 O 4 catalyst showed a stronger tolerance for catalytic deactivation than the Pt–Sn/Al 2 O 3 catalyst. In this study, we propose that the high catalytic stability of Pt–Sn/ZnAl 2 O 4 originates from the relatively faster coke mobility from the metal surface to the support, …

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Preparation of highly dispersed Pt–Sn/Al2O3 catalysts via …

An increase in the Sn/Pt ratio will further reduce the particle size of Pt and increase its dispersion. When the Sn/Pt ratio is 1.5, it shows the best catalytic activity. The metal particle size of the catalyst has a great influence on the dehydrogenation process of methylcyclopentane (MCP), showing an obvious size effect.

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Sn surface-enriched Pt–Sn bimetallic nanoparticles as a …

The presence of Bu 3 SnH during the synthesis has a significant effect on the Pt NPs crystallization process. The THF solution turned to black instantly when the synthesis was performed at low Sn/Pt molar ratio, and the Pt NPs started to precipitate from THF in 10 min ().When the Sn/Pt ratio was increased to 1, a step-wise color change of the THF solution into …

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Synthesis of Pt–Sn core–shell nanoparticles deposited on …

Abstract A novel one-step synthesis method to prepare Pt–Sn bimetallic nanoparticles supported on mesoporous silica with high surface area (SBA-15, 700 m2/g) and narrow pore size distribution (around 9.5 nm) was developed. Tin incorporation plays an important dual role, to create active sites into the silica walls that serve as particles anchors center, and …

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