Improvement of the kinetics of hydrogen release from ammonia borane confined in silica aerogel

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

“…In this case, the dehydriding temperature was lowered of 50ºC. Therefore, in this work silica could also act as additive improving the breakage of B-H bond from MBH which is the limitation of the decomposition process [21], similarly to those reported in [29].…”

“…Saturated CO 2 in the system was renewed four times in order to obtain completely dried particles. Dried silica aerogel microparticles had a porous structure with surface area of 723 m 2 /g and a pore volume of 1.35 cm 3 /g (mean pore size =7.5nm) [29]. Obtained SiO 2 aerogel particles were collected and stored in a closed vial at room temperature until used for MBH-SiO 2 composite preparation.…”

Demonstration of the nanosize effect of carbon nanomaterials on the dehydrogenation temperature of ammonia borane

“…Strategies have included adding catalysts, 9,10 dispersion in ionic liquids, 11,12 or exploiting the nanoconnement effect. [13][14][15][16] The nanoconnement effect on AB in mesoporous silica led to a lower dehydrogenation temperature, with a variety of porous materials subsequently developed, such as metalorganic frameworks (MOFs), carbon nanotubes (CNT), activated carbon, mesoporous silica, and mesoporous carbon, all of which have been studied in relation to nanoconnement. [13][14][15][16] This phenomenon is understood that thermodynamic property of AB, or H 2 release temperature is changed by tuning AB particle size.…”

The Recycling of Spent Ammonia Borane with HBr/AlBr3 and Other HX/AlX3‐Based Schemes

“…Because of the low hydrogen release temperatures and the wide range of dehydrogenation possibilities, the compound has been studied extensively in recent years . Most research in this context has been devoted to the hydrogen release kinetics of AB in different phases . The hydrogen release from AB is accompanied by a heat release caused by the formation of strong B−N bonds leading to borazine or polymerized BNH x ‐waste products like polyaminoborane and heavily cross‐linked polyborazylene (PB).…”

“…[7][8][9] Most research in this context has been devoted to the hydrogen release kinetics of AB in different phases. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] The hydrogen release from AB is accompanied by a heat release caused by the formation of strong BÀ N bonds leading to borazine or polymerized BNH x -waste products like polyaminoborane and heavily cross-linked polyborazylene (PB). The degree of dehydrogenation finally depends on the applied reaction conditions.…”