Synthesis, structure and dehydrogenation of magnesium amidoborane monoammoniatew
نویسندگان
چکیده
Ammonia borane (AB) is a promising material for hydrogen storage. However, onboard applications are subject to improvement in dehydrogenation kinetics and rehydrogenation. Recent research has shown that alkali or alkaline earth metal amidoboranes synthesized by reacting hydrides (LiH, NaH, or CaH2) with AB provide improved dehydrogenation properties compared with neat AB. LiNH2BH3 (LiAB), NaNH2BH3 (NaAB) and Ca(NH2BH3)2 (CaAB) are capable of releasing ca. 10.9, 7.5 and 8 wt% of H2 at moderate temperatures, respectively. 1–5
منابع مشابه
Synthesis, structure and dehydrogenation of magnesium amidoborane monoammoniate.
Magnesium amidoborane monoammoniate (Mg(NH(2)BH(3))(2) x NH(3)) which crystallizes in a monoclinic structure (space group P2(1)/a) has been synthesized by reacting MgNH with NH(3)BH(3). Dihydrogen bonds are established between coordinated NH(3) and BH(3) of [NH(2)BH(3)](-) in the structure, promoting stoichiometric conversion of NH(3) to H(2).
متن کاملMechanistic investigation on the formation and dehydrogenation of calcium amidoborane ammoniate.
Possessing high H(2) capacities and interesting dehydrogenation behavior, metal amidoborane ammoniates were prepared by reacting Ca(NH(2) )(2) , MgNH, and LiNH(2) with ammonia borane to form Ca(NH(2) BH(3) )(2) ⋅2 NH(3) , Mg(NH(2) BH(3) )(2) ⋅NH(3) , and Li(NH(2) BH(3) )(2) ⋅NH(3) (LiAB⋅NH(3) ). Insight into the mechanisms of amidoborane ammoniate formation and dehydrogenation was obtained b...
متن کاملSynthesis, structure and the dehydrogenation mechanism of calcium amidoborane hydrazinates.
The calcium amidoborane hydrazinates, Ca(NH2BH3)2·nN2H4, were firstly synthesized by reacting different molar ratios of Ca(NH2BH3)2 and N2H4. In particular, Ca(NH2BH3)2 and N2H4 with a molar ratio of 1 : 2 crystallizes into the orthorhombic symmetry P212121 space group with the lattice parameters of a = 6.6239(4) Å, b = 13.7932(6) Å, c = 4.7909(2) Å. The dehydrogenations of calcium amidoborane ...
متن کاملPromotion of hydrogen release from ammonia borane with magnesium nitride.
Hydrogen release from ammonia borane (NH(3)BH(3), AB) can be greatly promoted by mechanical milling with magnesium nitride (Mg(3)N(2)). For example, a post-milled 6AB/Mg(3)N(2) sample started to release hydrogen from ∼65 °C and gave a material-based hydrogen capacity of ∼11 wt% upon heating to 300 °C. In addition to the improved dehydrogenation kinetics, the 6AB/Mg(3)N(2) sample also showed sat...
متن کاملMetal Amidoboranes and Their Derivatives for Hydrogen Storage
As potential hydrogen storage mediums, ammonia borane and its derivatives have been paid an increasing attention owing to their higher hydrogen capacities and facile dehydrogenation properties under moderate conditions. In this chapter, we presented extensive studies on thermodynamic tailoring of dehydrogenation of metal amidobor‐ anes, metal borohydride-ammonia borane complexes, and metal amid...
متن کامل