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Dynamic In-situ X-ray Diffraction of Catalyzed Alanates.

DE2001769323

Publication Date	2000
Personal Author	Gross, K. J.; Sandrock, G.; Thomas, G. J.
Page Count	14
Abstract	The discovery that hydrogen can be reversible absorbed and desorbed from NaA1H4 by the addition of catalysts has created an entirely new prospect for lightweight hydrogen storage. NaA1H4 releases hydrogen through the following set of decomposition reactions. These decomposition reactions as well as the reverse recombination reactions were directly observed using time-resolved in-situ x-ray powder diffraction. These measurements were performed under conditions similar to those found in PEM fuel cell operations. In this study, the alanate was doped with a catalyst by dry ball-milling NaA1H4 with 2 mol.% solid TiCl3. X-ray diffraction clearly showed that TiC13 reacts with NaA1H4 to form NaC1 during the doping process. Partial desorption of NaA1H4 was even observed to occur during the catalyst doping process.
Keywords	Hydrogen storage Metal hydrides Fuel cells
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Sandia National Labs., Albuquerque, NM.; Department of Energy, Washington, DC.; Sunatech, Inc., Ringwood, NJ.
Supplemental Notes	Prepared in cooperation with Sunatech, Inc., Ringwood, NJ. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200122

Dynamic In-situ X-ray Diffraction of Catalyzed Alanates.

Dynamic In-situ X-ray Diffraction of Catalyzed Alanates.
DE2001769323

Publication Date	2000
Personal Author	Gross, K. J.; Sandrock, G.; Thomas, G. J.
Page Count	14
Abstract	The discovery that hydrogen can be reversible absorbed and desorbed from NaA1H4 by the addition of catalysts has created an entirely new prospect for lightweight hydrogen storage. NaA1H4 releases hydrogen through the following set of decomposition reactions. These decomposition reactions as well as the reverse recombination reactions were directly observed using time-resolved in-situ x-ray powder diffraction. These measurements were performed under conditions similar to those found in PEM fuel cell operations. In this study, the alanate was doped with a catalyst by dry ball-milling NaA1H4 with 2 mol.% solid TiCl3. X-ray diffraction clearly showed that TiC13 reacts with NaA1H4 to form NaC1 during the doping process. Partial desorption of NaA1H4 was even observed to occur during the catalyst doping process.
Keywords	Hydrogen storage Metal hydrides Fuel cells
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Sandia National Labs., Albuquerque, NM.; Department of Energy, Washington, DC.; Sunatech, Inc., Ringwood, NJ.
Supplemental Notes	Prepared in cooperation with Sunatech, Inc., Ringwood, NJ. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200122