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Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO2 Reforming
Ersi Nikolaraki1, Grammatiki Goula1, Paraskevi Panagiotopoulou1
1Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, Greece.
Ceria-zirconia (CZ) supported iridium catalysts show excellent performance for low-temperature methane dry reforming, producing valuable syngas. These catalysts exhibit enhanced stability against sintering and reduced carbon deposition, making them promising for sustainable energy applications.
Area of Science:
- Heterogeneous catalysis
- Renewable energy technologies
- Sustainable chemistry
Background:
- Syngas (H2 and CO) production via dry reforming of methane (DRM) is crucial for energy carriers.
- Low-temperature DRM (LT-DRM) is gaining attention for efficiency and sustainability.
- Metal oxide supports significantly influence catalyst performance in DRM.
Purpose of the Study:
- Investigate the effect of different metal oxide supports (γ-Al2O3, ACZ, CZ) on iridium-based catalysts for LT-DRM.
- Evaluate catalyst activity, selectivity, carbon deposition resistance, and sintering stability.
- Understand the role of metal-support interactions and material properties in DRM performance.
Main Methods:
- Synthesis and characterization of Ir/γ-Al2O3, Ir/ACZ, and Ir/CZ catalysts.
- Testing catalyst performance in low-temperature dry reforming of methane (500-750 °C).
- Analysis using various characterization techniques to study material properties and reaction mechanisms.
Main Results:
- All tested catalysts demonstrated stable DRM performance over time.
- Supports with high oxygen storage capacity (ACZ and CZ) enhanced CO2 conversion and produced CO-enriched syngas.
- CZ-supported iridium catalysts exhibited exceptional resistance to nanoparticle sintering.
- Carbon deposition decreased in the order Ir/γ-Al2O3 > Ir/ACZ > Ir/CZ.
- A bifunctional mechanism involving oxygen vacancies for CO2 activation and carbon removal was proposed.
Conclusions:
- CZ-supported iridium nanoparticles are highly promising catalysts for LT-DRM.
- The choice of metal oxide support critically impacts catalyst stability and activity.
- Oxygen vacancies on the support play a key role in the catalytic mechanism for LT-DRM.
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