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Crystal Phase-Dependent Ga-H Chemistry and H2 Roles in Ga2O3-Catalyzed Propane Dehydrogenation Reaction
Hantao Peng1, Jialin Li1, Zeyue Wei1
1State Key Laboratory of Precision and Intelligent Chemistry, iChEM, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China.
Hydrogen co-feeding has phase-dependent roles in gallium oxide (Ga2O3)-catalyzed propane dehydrogenation (PDH). It suppresses the reaction over α-Ga2O3 but promotes it over β-Ga2O3, depending on hydride stability.
Area of Science:
- Catalysis
- Chemical Reaction Engineering
- Materials Science
Background:
- Propane dehydrogenation (PDH) is crucial for producing propylene, a key petrochemical feedstock.
- Understanding the role of co-fed hydrogen in oxide-catalyzed PDH is essential for process optimization.
- Gallium oxide (Ga2O3) is an emerging catalyst for PDH, exhibiting different phases (α and β) with potentially distinct properties.
Purpose of the Study:
- To investigate the phase-dependent effects of hydrogen co-feeding on Ga2O3-catalyzed PDH.
- To elucidate the mechanisms behind hydrogen's opposing roles in the α-Ga2O3 and β-Ga2O3 catalyzed reactions.
- To correlate the stability and reactivity of surface hydride species with catalytic performance.
Main Methods:
- Experimental investigation of PDH over α-Ga2O3 and β-Ga2O3 catalysts with and without H2 co-feeding.
- Kinetic studies to determine reaction orders and apparent activation energies.
- In-situ/operando spectroscopy or theoretical calculations to characterize surface species (e.g., Ga-H hydrides).
Main Results:
- H2 co-feeding suppresses PDH over α-Ga2O3 (negative reaction order, unchanged activation energy) due to stable, inert Ga-H species blocking active sites.
- H2 co-feeding promotes PDH over β-Ga2O3 (positive reaction order, decreased activation energy) via reactive, reversibly adsorbed Ga-H species.
- The stability of Ga-H hydrides differs significantly between α-Ga2O3 and β-Ga2O3.
Conclusions:
- The role of H2 in Ga2O3-catalyzed PDH is critically dependent on the catalyst phase (α vs. β).
- Stable surface hydrides on α-Ga2O3 inhibit propane activation, while dynamic hydrides on β-Ga2O3 facilitate it.
- Tailoring Ga2O3 phase and understanding H2 interactions are key for designing efficient PDH catalysts.
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