377791 Effective Thermal Conductivity of Packed Beds and Benefit of in-Situ W ALD: Original Sample Preparation Technique

Wednesday, November 19, 2014: 9:08 AM
209 (Hilton Atlanta)
Staci A. Van Norman1, Jeni Sorli1, Ronggui Yang2, Joseph W. Tringe3, John D. Sain3, John L. Falconer1 and Alan W. Weimer1, (1)Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO, (2)Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, (3)Lawrence Livermore National Lab

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.

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