Synthesis of Pt3Zn1 and Pt1Zn1 intermetallic nanocatalysts for dehydrogenation of ethane

Gan, Zhuoran; Lü, Zheng; Bunian, Muntaseer; Lagria, Larissa B.; Marshall, Christopher L.; Banish, R. Michael; Lee, Sungwon; Yu, Lei

doi:10.1039/d2cp04173a

“…Pt-based alloys help to increase the electron density on the Pt surface and enhance propylene selectivity. − Nevertheless, the formation of metal alloy nanoparticles also results in reduced dehydrogenation activity and exposed Pt sites. To maximize dehydrogenation activity, sub-nanometric Pt clusters anchored by heteroatoms in zeolites were favorable for PDH. ,, Heteroatoms in zeolite ensure a high dispersion of Pt species under a high reaction temperature.…”

Section: Pt-based Zeolite Catalystsmentioning

confidence: 99%

Recent Advances in Metal−Zeolite Catalysts for Direct Propane Dehydrogenation

Zhang,

Song,

Xu

et al. 2023

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Non‐Classical Deactivation Mechanism in a Supported Intermetallic Catalyst for Propane Dehydrogenation

Tian,

Kong,

Deng

et al. 2024

Angewandte Chemie

0

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Platinum‐based supported intermetallic alloys (IMAs) demonstrate exceptional performance in catalytic propane dehydrogenation (PDH) primarily because of their remarkable resistance to coke formation. However, these IMAs still encounter a significant hurdle in the form of catalyst deactivation. Understanding the complex deactivation mechanism of supported IMAs, which goes beyond conventional coke deposition, requires meticulous microscopic structural elucidation. In this study, we unravel a nonclassical deactivation mechanism over a PtZn/γ‐Al2O3 PDH catalyst, dictated by the PtZn to Pt3Zn nanophase transformation accompanied with dezincification. The physical origin lies in the metal support interaction (MSI) that enables strong chemical bonding between hydroxyl groups on the support and Zn sites on the PtZn phase to selectively remove Zn species followed by the reconstruction towards Pt3Zn phase. Building on these insights, we have devised a solution to circumvent the deactivation by passivating the MSI through surface modification of γ‐Al2O3 support. By exchanging protons of hydroxyl groups with potassium ions (K) on the γ‐Al2O3 support, such a strategy significantly minimizes the dezincification of PtZn IMA via diminished metal‐support bonding, which dramatically reduces the deactivation rate from 0.2044 to 0.0587 h‐1.

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Non‐Classical Deactivation Mechanism in a Supported Intermetallic Catalyst for Propane Dehydrogenation

Tian,

Kong,

Deng

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

Platinum‐based supported intermetallic alloys (IMAs) demonstrate exceptional performance in catalytic propane dehydrogenation (PDH) primarily because of their remarkable resistance to coke formation. However, these IMAs still encounter a significant hurdle in the form of catalyst deactivation. Understanding the complex deactivation mechanism of supported IMAs, which goes beyond conventional coke deposition, requires meticulous microscopic structural elucidation. In this study, we unravel a nonclassical deactivation mechanism over a PtZn/γ‐Al2O3 PDH catalyst, dictated by the PtZn to Pt3Zn nanophase transformation accompanied with dezincification. The physical origin lies in the metal support interaction (MSI) that enables strong chemical bonding between hydroxyl groups on the support and Zn sites on the PtZn phase to selectively remove Zn species followed by the reconstruction towards Pt3Zn phase. Building on these insights, we have devised a solution to circumvent the deactivation by passivating the MSI through surface modification of γ‐Al2O3 support. By exchanging protons of hydroxyl groups with potassium ions (K) on the γ‐Al2O3 support, such a strategy significantly minimizes the dezincification of PtZn IMA via diminished metal‐support bonding, which dramatically reduces the deactivation rate from 0.2044 to 0.0587 h‐1.

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Synthesis of Pt₃Zn₁ and Pt₁Zn₁ intermetallic nanocatalysts for dehydrogenation of ethane

Abstract: Pt3Zn1and Pt1Zn1intermetallic nanoparticles supported on SiO2were synthesized by combining atomic layer deposition (ALD) of ZnO, incipient wetness impregnation (IWI) of Pt, and appropriate hydrogen reduction. The formation of Pt1Zn1and Pt3Zn1intermetallic...

Cited by 5 publications

References 38 publications

Recent Advances in Metal−Zeolite Catalysts for Direct Propane Dehydrogenation

Recent Advances in Metal−Zeolite Catalysts for Direct Propane Dehydrogenation

Non‐Classical Deactivation Mechanism in a Supported Intermetallic Catalyst for Propane Dehydrogenation

Non‐Classical Deactivation Mechanism in a Supported Intermetallic Catalyst for Propane Dehydrogenation

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