H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites.

H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites. Research Abstract Details 

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H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites. Abstract Text:

Low-coordinate Ti (III) fragments with controlled geometries designed specifically for sigma-H 2 binding were grafted onto mesoporous silica using tri- and tetrabenzyl Ti precursors. The hydrogen storage capacity was tested as a function of precursor and precursor loading level. At an optimal loading level of 0.2 mol equiv tetrabenzyl Ti the total storage capacity at -196 degrees C was 21.45 wt % and 34.10 kg/m (3) at 100 atm, and 3.15 wt % and 54.49 kg/m (3) for a compressed pellet under the same conditions. The adsorption value of this material was 1.66 wt %, which equates to an average of 2.7 H 2 per Ti center. The adsorption isotherms did not reach saturation at 60 atm, suggesting that the theoretical maximum of 5 H 2 per Ti in this system may be reached at higher pressures. The binding enthalpies rose with surface coverage to a maximum of 22.15 kJ/mol, which is more than double that of the highest recorded previously and within the range predicted for room temperature performance. The adsorption values of 0.99 at -78 degrees C and 0.69 at 25 degrees C demonstrate retention of 2.4 H 2 and 1.1 H 2 per Ti at these temperatures, respectively. These findings suggest that Kubas binding of H 2 may be exploited at ambient temperature to enhance the storage capacities of high-pressure cylinders currently used in hydrogen test vehicles.

H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites. Publishing Authors By Initials

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H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of the American Chemical Society

VOLUME: 130

Page Numbers: 6992-9

Journal Abbreviation: J. Am. Chem. Soc.

ISSN: 1520-5126

DAY: 8

MONTH: 05

YEAR: 2008

H2 Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as sigma-H2 Binding Sites. Information

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LANGUAGE: eng

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