CASE STUDY – CATALYSIS
Scalable synthesis of supported catalysts using fluidized bed atomic layer deposition
Authors: Zheng Lu et. Al
Institution: Argonne National Laboratory
Application: Catalysis
Summary: Overcoating layers deposited on the surface of heterogeneous catalysts using atomic layer deposition (ALD) have been shown to increase catalyst activity, lifetime, and selectivity. In this study, Al2O3 ALD and Pd ALD were performed in a Forge Nao Prometheus fluidized bed reactor on high surface area mesoporous powder supports to create overcoated catalysts with high precursor utilization. Reaction mechanisms for both Al2O3 ALD and Pd ALD using in situ mass spectrometry and developed a mathematical model to understand the precursor saturation behaviors. Propane dehydrogenation was used as a probe reaction to evaluate the performance of the catalysts prepared by fluidized bed ALD. Catalyst performance, saturation models and precursor utilization show an excellent pathway to the scale up of catalyst synthesis with ALD using fluidized bed reactors.
Key Takeaways:
- ALD-overcoated Pt/SiO2 catalysts showed higher stability than the uncoated catalysts, with propane conversion dropping only 1.4% vs 6.6% over the experiment
- ALD-overcoated catalyst propane selectivity remained unchanged
- Precursor usage shown up to 91.8% indicating efficient chemical utilization in fluidized bed reactors
- Models predicted increasing precursor utilization with increasing surface area, showing the promise for scaling depositions with expensive precursors
Read the Full Paper: https://doi.org/10.1116/6.0001891
Related Tools:
R&D – Prometheus
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