Thermodynamic assessments of the V–Ge and V–Pt systems

Wang, C.P.; Zheng, An; Liu, X.J.

doi:10.1016/j.intermet.2008.01.002

Cited by 11 publications

(3 citation statements)

References 21 publications

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“…Pt can form a solid solution with V, but the solubility (which decreases with temperature) is limited to 15 at. % V at 400 °C . From the isothermal–isobaric phase diagram, Pt 3 V, Pt 2 V, and PtV were identified as thermodynamically stable phases.…”

Section: Discussionmentioning

confidence: 99%

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Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Purdy

Ghanekar

Mitchell

et al. 2020

ACS Appl. Energy Mater.

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We demonstrate the synthesis of a Pt 3 V alloy and Pt/Pt 3 V core/shell catalysts, which are highly selective for propane dehydrogenation. The selectivity is a result of the Pt 3 V intermetallic phase, which was characterized by in situ synchrotron XRD and XAS. Formation of a continuous alloy surface layer 2−3 atomic layers thick was sufficient to obtain identical catalytic properties between a core−shell and full alloy catalyst, which demonstrates the length scale over which electronic effects pertinent to dehydrogenation act. Electronic characterization of the alloy phase was investigated by using DFT, XPS, XANES, and RIXS, all of which show a change in the energy of the filled and unfilled Pt 5d states resulting from Pt−V bonding. The electronic modification leads to a change in the most stable binding site of hydrocarbon fragments, which bind to V containing ensembles despite the presence of 3-fold Pt ensembles in Pt 3 V. In addition, electronic modification destabilizes deeply dehydrogenated species thought to be responsible for hydrogenolysis and coke formation.

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Section: Discussionmentioning

confidence: 99%

“…% V at 400 °C. 43 From the isothermal−isobaric phase diagram, Pt 3 V, Pt 2 V, and PtV were identified as thermodynamically stable phases.…”

Section: ■ Discussionmentioning

confidence: 99%

Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Purdy

Ghanekar

Mitchell

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…He proposed a phase diagram consisting of two solid solution regions and four known stable intermetallic compounds (PtV 3 , PtV, PtV 2 , and Pt 3 V), whilst Wang et al calculated the enthalpy of formation of the intermetallic phases [11]. The study of the V-rich side of the Pt-V phase diagram and formation of V-rich phases could potentially be of interest in nuclear engineering since vanadium has a low neutron cross section.…”

Section: Introductionmentioning

confidence: 99%

Scratch resistance of platinum–vanadium single and multilayer systems

Topić

Favaro²,

Bucher

2011

Surface and Coatings Technology

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Ge-V (Germanium-Vanadium)

Okamoto

2009

J. Phase Equilib. Diffus.

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Thermodynamic assessments of the V–Ge and V–Pt systems

Cited by 11 publications

References 21 publications

Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Scratch resistance of platinum–vanadium single and multilayer systems

Ge-V (Germanium-Vanadium)

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Thermodynamic assessments of the V–Ge and V–Pt systems

Cited by 11 publications

References 21 publications

Origin of Electronic Modification of Platinum in a Pt3V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Origin of Electronic Modification of Platinum in a Pt3V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Scratch resistance of platinum–vanadium single and multilayer systems

Ge-V (Germanium-Vanadium)

Contact Info

Product

Resources

About

Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis

Origin of Electronic Modification of Platinum in a Pt₃V Alloy and Its Consequences for Propane Dehydrogenation Catalysis