Formation of aluminium hydride (AlH3) via the decomposition of organoaluminium and hydrogen storage properties
MetadataShow full item record
© 2017 Hydrogen Energy Publications LLC. Aluminium hydride (AlH3) is a promising hydrogen storage material due to its competitive hydrogen storage density and moderate decomposition temperature. However, there is no convenient way to prepare/regenerate AlH3from (spent) Al by direct hydrogenation. Herein, we report on a novel approach to generate AlH3from the decomposition of triethylaluminium (Et3Al) under mild hydrogen pressures (10 MPa) with the use of surfactants. With tetraoctylammonium bromide (TOAB), the synthesis led to the formation of nanosized AlH3with the known a phase, and these nanoparticles released hydrogen from 40 °C instead of the 125 °C observed with bulk a-AlH3. However, when tetrabutylammonium bromide (TBAB) was used instead of TOAB, larger nanoparticles believed to be related to the formation of ß-AlH3were obtained, and these decomposed through a single exothermic process. Despite the possibility to form a-AlH3under low conditions of temperature (180 °C) and pressure (10 MPa), TOAB stabilised AlH3was found to be irreversible when subjected to hydrogen cycling at 150 °C and 7 MPa hydrogen pressure.
Showing items related by title, author, creator and subject.
Sheppard, Drew A (2008)Concerns over green house gas emissions and their climate change effects have lead to a concerted effort into environmental friendly technologies. One such emphasis has been on the implementation of the hydrogen economy. ...
Kowalczyk, Poitr; Tanaka, H.; Holyst, R.; Kaneko, K.; Ohmori, T.; Miyamoto, J. (2005)Grand canonical Monte Carlo (GCMC) simulations were used for the modeling of the hydrogen adsorption in idealized graphite slitlike pores. In all simulations, quantum effects were included through the Feynman and Hibbs ...
Murshidi, Julie Andrianny (2012)Concerns about the impact that fossil fuels have on the environment and their increasing price to the consumer have led to research being undertaken to evaluate and refine other energy carriers that will be comparable to ...