Deuterium-Hydrogen Exchange in Solid Mg(BH4)(2)

作者：Hagemann Hans^*; D'Anna Vincenza; Rapin Jean Philippe; Yvon Klaus

来源：Journal of Physical Chemistry C, 2010, 114(21): 10045-10047.

DOI：10.1021/jp101484f

Deuterium-hydrogen exchange in solid alpha-Mg(BH4)(2) is demonstrated. Compared to the previously reported exchange reactions in the alkali borohydrides, the temperature at which isotope exchange starts to take place is significantly lower (132 degrees C vs 200 degrees C for LiBH4). The activation energy for the deuterium-hydrogen exchange reaction is estimated to be 51 +/- 15 kJ/mol. Almost complete isotope exchange was observed by treating solid Mg(BH4)(2) for 72 h at 172 degrees C with 42 bar of D-2. Preliminary experiments indicate that under these conditions Ca(BH4)(2) also undergoes isotope exchange.

• 出版日期2010-6-3