Thermodynamic and Catalytic Properties of ALD-Grown Fe2O3 and CeFeO3 Thin Films on High Surface Area Supports | AIChE

Thermodynamic and Catalytic Properties of ALD-Grown Fe2O3 and CeFeO3 Thin Films on High Surface Area Supports


Conference Presentation

Conference Type

AIChE Annual Meeting

Presentation Date

November 14, 2022


20 minutes

Skill Level




Redox active materials like Fe2O3 are used as catalysts for a range of reactions such as selective oxidation, water gas shift, and oxidative dehydrogenation, just to name a few. They have also recently gained interest as oxygen carriers for chemical looping (CL) reactor schemes, such as CL H2 production in which the oxide oxygen carrier is reduced at high temperature in one reactor and then re-oxidized with water, which also produces H2, in a separate reactor. Since it is difficult to maintain high surface area for many redox active oxides, including iron oxide, the use of thin films on a separate support could potentially lead to more active systems. Confining the oxide film to two-dimensions also affects its thermodynamic redox properties which could in principle be used to tailor activity for specific reactions. In this talk we will present our recent results on using Atomic Layer Deposition (ALD) to grow conformal ultrathin (<2 nm) films of Fe2O3 and CeFeO3 on a high surface area g‑Al2O3 support. The reaction engineering challenges involved in using ALD to grow oxide films on a high surface area material and how they can be overcome will first be discussed. We will then present thermodynamic data that shows how the heat of reduction of Fe2O3 varies as a function of film thickness and how this affects its reactivity for the water gas shift reaction. Finally, we will present results for the ALD growth of thin films of CeFeO3, a material which is difficult to synthesize in bulk form. This material has a rich phase behavior in which both the Ce and Fe cations are redox active making it of interest as both a catalyst and as a support for metal catalysts.


Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.




Do you already own this?



AIChE Member Credits 0.5
AIChE Pro Members $19.00
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Catalysis and Reaction Engineering Division Members Free
AIChE Explorer Members $29.00
Non-Members $29.00