(421m) Packed Bed Packets, Effective Thermal Conductivity and Advantage of in-Situ W ALD

Authors: 
Van Norman, S. A., University of Colorado Boulder
Sorli, J., University of Colorado at Boulder
Yang, R., University of Colorado at Boulder
Tringe, J. W., Lawrence Livermore National Lab
Sain, J. D., Lawrence Livermore National Lab
Falconer, J. L., University of Colorado Boulder
Weimer, A. W., University of Colorado at Boulder

Tungsten is added to a porous structure in order to increase the effective thermal conductivity (keff) of the starting material and surpass the keff of a packed Al2O3 catalyst support.  The conformal self-limited ALD reaction maintains porous properties of the starting material, preserves surface area of the catalyst support, and improves thermal conductivity.  In-situ W ALD of 25 cycle’s deposit uniformly throughout a packed bed of porous particles and particle internal volume and display increased keff.  An original sample preparation technique was used for measuring thermal conductivity of packed beds coated by ALD.