Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
Tuesday, March 6, 2018
LACC Room: West Hall A
Abstract: G60.00330 : Ultrasmall Angle X-ray Scattering (USAXS), Wide Angle X-ray Scattering (WAXS), and Raman Studies on the Complex Metal Hydride NaAlH4*
(Physics and Astronomy, University of Missouri)
(Advanced Photon Source, Argonne National Laboratory)
This research seeks to understand the role of ScCl3, ZrCl4, and VCl3 catalysts in NaAlH4 by examining these hydrides at multiple length scales using an X-ray scattering instrument which is capable of simultaneously measuring scattering wave vector, Q, of 0.0001Å-1 to 6.0 Å-1. Isothermal studies were performed at 30oC, 65oC, 100oC, 135oC, and 170oC. Results show an increased surface area as temperature increased for all doped samples (and milled). Pore size remains relatively constant with temperature. Doped samples show 70-80nm pore sizes while milled is smaller. At 135oC, there is little change in surface area or radius of gyration (Rg) for all samples. The number of pores in the 50-70nm size range increases with both temperature (T) and time (t). Raman and WAXS data show no product phase and so the changes in pore structure are occuring before measurable hydrogen desorption occurs.
*General support came from the NSF (grant # DMR1231153). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
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