(436c) Effective Thermal Conductivity of Packed Beds and Benefit of in-Situ W ALD: Original Sample Preparation Technique
AIChE Annual Meeting
2014
2014 AIChE Annual Meeting
Particle Technology Forum
Characterization of Engineered Particles and Nanostructured Particulate Systems
Wednesday, November 19, 2014 - 9:08am to 9:27am
In-situ W ALD deposits uniformly throughout a packed bed of porous particles and particle internal volume and display increased effective thermal conductivity (keff). An original sample preparation technique was developed for measuring thermal conductivity of packed beds coated by ALD. Intimate particle contact surfaces were revealed from 3D X-ray. Imaging in-situ ALD particles confirm wetted surfaces between particles; these contact surfaces are theorized to increase keff of the packed bed. The conformal self-limited ALD reaction maintains porous properties of the starting material, preserves surface area of the catalyst support, and improves keff.