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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
Non-Classical Deactivation Mechanism in a Supported Intermetallic Catalyst for Propane Dehydrogenation
Jinshu Tian1, Ru Kong1, Bin Deng1
1Center for Electron Microscopy, College of Chemical Engineering, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and Institute for Frontier and Interdisciplinary Sciences, Zhejiang University of Technology, Hangzhou, 3100144, P. R. China.
Platinum-based intermetallic alloys (IMAs) show promise for propane dehydrogenation (PDH) but deactivate. This study reveals a nonclassical deactivation pathway and demonstrates a surface modification strategy to enhance catalyst stability.
Area of Science:
- Catalysis and Materials Science
- Surface Chemistry and Nanotechnology
Background:
- Platinum-based supported intermetallic alloys (IMAs) are highly effective for catalytic propane dehydrogenation (PDH).
- Catalyst deactivation remains a significant challenge, necessitating a deeper understanding beyond traditional coke formation.
- Supported IMAs exhibit unique deactivation mechanisms that require advanced structural analysis.
Purpose of the Study:
- To elucidate the nonclassical deactivation mechanism of PtZn/γ-Al2O3 in PDH catalysis.
- To identify the role of metal-support interactions (MSI) in catalyst deactivation.
- To develop a strategy for enhancing the long-term stability of IMAs in PDH reactions.
Main Methods:
- Microscopic structural elucidation of deactivated PtZn/γ-Al2O3 catalysts.
- Investigation of metal-support interactions (MSI) using surface modification techniques.
- Catalytic testing of modified catalysts to evaluate deactivation rates.
Main Results:
- A nonclassical deactivation mechanism involving PtZn to Pt3Zn nanophase transformation and dezincification was identified.
- Strong metal-support bonding between γ-Al2O3 hydroxyl groups and PtZn facilitated Zn removal and phase reconstruction.
- Surface modification of γ-Al2O3 with potassium ions significantly reduced dezincification and deactivation rate (from 0.2044 to 0.0587 h⁻¹).
Conclusions:
- The study decodes a nonclassical deactivation pathway in supported IMA catalysts for PDH.
- Passivating metal-support interactions via surface modification offers a novel approach for designing stable IMAs.
- These findings provide a new paradigm for developing high-performance, long-lasting PDH catalysts.
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