ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
High surface area nanoporous powders of hexagonal boron nitride (h-BN) have beenprepared from molecular precursors to be used for hydrogen sequestration. The more promisingsamples were obtained using a precursor derived from trichloroborazine (TCB). The precursor wasfirst reacted with ammonia at room temperature leading to the molecular complex Cl3B3N3H3, 6NH3 which was heated up to 650 °C under ammonia and then up to 1000 °C under nitrogen, givingrise to a high reactive h-BN powder. This crude powder was stabilised by an annealing up to 1800°C under nitrogen atmosphere leading to a very stable compound exhibiting a specific area of morethan 300 m2·g-1 and presenting a very specific nanometric spherical texture. Some samples weredoped with platinum (about 1 wt.%) to enhance the activity of pure h-BN using an original one stepsynthesis route starting from a mixture of BN and Pt precursors. Attempts to sequester hydrogeninto these powders were made successfully at -196 °C under 10 MPa, but the stored amount wasonly about 0.3 wt.% and the platinum added BN powders did not lead to an enhancement of thestorage capacity
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.555.355.pdf
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