Improved low-temperature hydrogen generation from Ammonia borane and TiO2 composites pretreated with water

Journal Reference

International Journal of Hydrogen Energy, Volume 38, Issue 15, 2013, Pages 6442–6449.

O.V. Komova1, V.I. Simagina1, N.L. Kayl1, 2, G.V. Odegova1, O.V. Netskina1, Y.A. Chesalov1, A.M. Ozerova1

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1 Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, Novosibirsk 630090, Russia

2 Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia

Abstract
Ammonia borane (AB, NH3BH3) is nontoxic easily transportable solid hydride with high stability in air. In this work we demonstrate that simple mixing of Ammonia borane with TiO2 (anatase) allows for hydrogen gas to be generated at temperatures as low as 80 °C. No losses of hydrogen have been observed during preparation of hydride-containing composites. It was shown that the adsorption of water vapor on TiO2 and the increase of TiO2 loading considerably accelerated the rate of Ammonia borane decomposition. The experimentally observed formation of B–O chemical bonds and the elevated heat emission suggest strong interaction of Ammonia borane with the adsorbed water species on TiO2 surface. It has been found that this interaction proceeds at a higher rate comparing with binary Ammonia borane/H2O systems. The heat being released in the process is thought to contribute to overcoming the activation barrier in the dehydrogenation of ammonia borane to produce hydrogen gas.

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