Effect of Composition on Dehydrogenation of Mesoporous Silica/Ammonia Borane Nanocomposites

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This paper discusses the dehydrogenation of ammonia borane (AB) and MCM-41/AB nanocomposites in which the loading level of AB (i.e., the mass ratio of AB to mesoporous silica) varies from 0.11 to 2.36. The dehydrogenation temperatures shift to low temperatures with decreasing loading levels. At loading levels of 0.11 and 0.15, only one dehydrogenation step is observed at temperatures less than 200 degrees C. Our results also show that 12.6 wt % of hydrogen in the incorporated AB is liberated from the nanocomposite at a loading level of 0.15 in 1 h at 89.5 degrees C. We deduce that AB confined within the mesopores is amorphous, while AB outside of the channels has a tetragonal structure. Furthermore, we deduce that at relative low loading levels AB coats the inner surface of mesoporous silica as a monolayer.
Publisher
AMER CHEMICAL SOC
Issue Date
2011-09
Language
English
Article Type
Article
Keywords

CHEMICAL HYDROGEN STORAGE; N-H COMPOUNDS; AMMONIA-BORANE; THERMAL-DECOMPOSITION; CATALYZED DEHYDROGENATION; CARBON-DIOXIDE; FRAMEWORK; CRYOGEL; RELEASE

Citation

INDUSTRIAL ENGINEERING CHEMISTRY RESEARCH, v.50, no.17, pp.10024 - 10028

ISSN
0888-5885
DOI
10.1021/ie200330x
URI
http://hdl.handle.net/10203/104136
Appears in Collection
CBE-Journal Papers(저널논문)
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