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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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From Lab to Technical CO2 Hydrogenation Catalysts: Understanding PdZn Decomposition
Pierfrancesco Ticali1, Davide Salusso1, Alessia Airi1
1Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, Turin10125, Italy.
ACS Applied Materials & Interfaces
|January 23, 2023
Summary
Scaling up a CO2 conversion catalyst (PdZn/ZrO2 + SAPO-34) to produce propane resulted in decreased performance. Catalyst preparation methods led to undesirable zinc aluminate formation and palladium separation, reducing catalytic activity.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- CO2 valorization is crucial for a net-zero society, with catalysts converting CO2 and H2 into valuable chemicals like propane.
- Previous work introduced a PdZn/ZrO2 + SAPO-34 catalyst for this conversion.
Purpose of the Study:
- Investigate the scale-up of the PdZn/ZrO2 + SAPO-34 catalyst for CO2 to propane conversion.
- Evaluate the impact of mixing and shaping methods (tablets, extrudates) on catalyst performance and structure.
Main Methods:
- Scaled-up catalysts were prepared by mixing (1:1 mass ratio) and shaping individual components with an alumina binder.
- Catalytic performance was assessed for CO2 and H2 conversion into propane.
- Structural and spectroscopic analyses (FT-IR, X-ray absorption spectroscopy) were employed to characterize catalysts.
Main Results:
- Scaled-up catalysts (tablets, extrudates) showed lower performance compared to a physical mixture.
- Preparation induced zinc migration, forming zinc aluminates from the alumina binder, particularly in extrudates.
- Absence of PdZn alloy and presence of metallic Pd (in extrudates) were observed post-activation, unlike the physical mixture.
Conclusions:
- Catalyst preparation negatively impacted element distribution and alloy formation, leading to reduced performance.
- Zinc aluminate formation and palladium separation are likely causes for decreased activity and altered product selectivity.
- Further investigation is needed to optimize scale-up strategies and mitigate catalyst deactivation.
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