Structure and reactivity of Pt–In intermetallic alloy nanoparticles : Highly selective catalysts for ethane dehydrogenation
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 146-153 |
Journal / Publication | Catalysis Today |
Volume | 299 |
Publication status | Published - 1 Jan 2018 |
Externally published | Yes |
Link(s)
Abstract
The structure of silica supported Pt and Pt–In bimetallic catalysts with nominal In:Pt atomic ratios of 0.7 and 1.4 were determined by in situ synchrotron XAS and XRD. It was seen that the addition of In led to the formation of two different intermetallic alloy phases. At an In:Pt ratio of 0.7 the Pt3In phase with a Cu3Au structure was formed. When the ratio was increased to 1.4 a shell of PtIn2 having a CaF2 structure formed around a core of Pt3In. The catalysts were tested for ethane dehydrogenation at 600 °C to determine the effect of alloying on ethylene selectivity and turnover rate (TOR). The monometallic Pt catalysts was 73% selective for ethylene and had an initial TOR of 0.7 s−1. Both alloy catalysts were ≈100% selective for dehydrogenation and had higher initial TOR, 2.8 s−1 and 1.6 s−1 for In:Pt ratio of 0.7 and 1.4, respectively. The increase in selectivity is attributed to the elimination of large Pt ensembles resulting from geometric changes to the catalyst surface upon alloying. Electronic changes due to the formation of Pt–In bonds are thought to be responsible for the increases in TOR in the alloy catalysts.
Research Area(s)
- Dehydrogenation selectivity, Ethane dehydrogenation, EXAFS of PtIn bimetallic nanoparticles, Geometric effects in bimetallic alloys, PtIn nanoparticles, Synchrotron XRD of nanoparticles
Bibliographic Note
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Citation Format(s)
Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation. / Wegener, Evan C.; Wu, Zhenwei; Tseng, Han-Ting et al.
In: Catalysis Today, Vol. 299, 01.01.2018, p. 146-153.
In: Catalysis Today, Vol. 299, 01.01.2018, p. 146-153.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review