Search results for "Lithium borohydride"
showing 4 items of 4 documents
Experimental investigation on lithium borohydride hydrolysis
2010
Abstract Lithium borohydride, one of the highest energy density chemical energy carriers, is considered as an attractive potential hydrogen storage material due to its high gravimetric hydrogen density (19.6%). Belonging to borohydride compounds, it presents a real issue to overcome aims fixed by the U.S. Department of Energy in the field of energy, and so crystallizes currently attention and effort to use this material for large scale civil and military applications. However, due to its important hygroscopicity, lithium borohydride is a hazardous material which requires specific handling conditions for industrial aspects. In order to understand much more the reaction mechanism involved bet…
Nanoconfined mixed Li and Mg borohydrides as materials for solid state hydrogen storage
2012
Abstract Several mixtures of LiBH4 and Mg(BH4)2 borohydrides in different stoichiometric ratios (1:0, 2:1, 1:1, 1:2, 0:1), prepared by high energy ball milling, have been investigated with X-ray powder diffraction and thermal programmed desorption (TPD) volumetric analysis to test the dehydrogenation kinetics in correlation with the physical mixture composition. Afterwards mixed and unmixed borohydrides were dispersed on high specific surface area ball milled graphite by means of the solvent infiltration technique. BET and statistical thickness methods were used to characterize the support surface properties, and SEM micrographs gave a better understanding of the preparation techniques. It …
Free and bound hydroxyl and carboxyl groups in the cutin of Quercus suber leaves
1984
Abstract The number of free and bound hydroxyl and carboxyl groups of the cutin of Quercus suber leaves was investigated by the lithium borohydride hydrogenolysis of mesyl-cutin compared with the lithium borohydride hydrogenolysis of untreated cutin. Fifty per cent of the vic -diol groups of the trihydroxy C 18 acid component and twenty five per cent of the secondary hydroxyl groups of the dihydroxy C 16 acid component are free. The rest of the secondary and all of the primary hydroxyl groups are esterified; all carboxyl groups are esterified.
Eine synthetische matrizenreaktion einer mischung von acrylsäureestern phenolischer mehrkernverbindungen; modell einer replicapolymerisation
1970
Mischungen der Acrylsaureester phenolischer Mehrkernverbindungen sowie zunachst unveresterter Verbindungen wurden einer synthetischen Matrizenreaktion unterworfen. Die so erhaltenen Verbindungsgemische liesen sich mit Lithiumborhydrid reduzierend spalten, so das neben den wiedergewonnenen phenolischen Mehrkernverbindungen Oligoallylalkoholmischungen entstanden. Deren Konzentrationsverhaltnisse waren mit einer geringen Streuung die gleichen wie jene der Acrylsaureester oder der phenolischen Mehrkernverbindungen in den Ausgangsmischungen. Mixtures of the acrylic esters of molecularly uniform polynuclear phenolic compounds and primarily not esterified compounds were cyclopolymerized. The so ob…