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Synthesis and Thermal Decomposition Behaviors of Magnesium Borohydride Ammoniates with Controllable Composition as Hydrogen Storage Materials
Author(s) -
Yang Yanjing,
Liu Yongfeng,
Li You,
Gao Mingxia,
Pan Hongge
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201200970
Subject(s) - borohydride , hydrogen storage , dehydrogenation , magnesium , inorganic chemistry , chemistry , hydrogen , ammonia , thermal decomposition , redistribution (election) , molar ratio , metal , organic chemistry , catalysis , politics , political science , law
An ammonia‐redistribution strategy for synthesizing metal borohydride ammoniates with controllable coordination number of NH 3 was proposed, and a series of magnesium borohydride ammoniates were easily synthesized by a mechanochemical reaction between Mg(BH 4 ) 2 and its hexaammoniate. A strong dependence of the dehydrogenation temperature and purity of the released hydrogen upon heating on the coordination number of NH 3 was elaborated for Mg(BH 4 ) 2 ⋅ x NH 3 owing to the change in the molar ratio of H δ+ and H δ− , the charge distribution on H δ+ and H δ− , and the strength of the coordinate bond N:→Mg 2+ . The monoammoniate of magnesium borohydride (Mg(BH 4 ) 2 ⋅NH 3 ) was obtained for the first time. It can release 6.5 % pure hydrogen within 50 minutes at 180 °C.