Mechanochemical reactions of alkali borohydride with CO2 under ambient temperature

Many efforts have been made to study the reactions of the borohydride with CO 2 in solution. However, it is scarce to achieve the hydrogenation of CO 2 using borohydrides as hydrogen source by the solid-gas direct reaction in the condition of ball milling under ambient temperature. Herein, we investigated the solid-gas noncatalytic reaction of ABH 4 (A = Li or Na) with CO 2 under mechanochemical conditions for the first time. It is found that hydrogen and trimethylborane are formed in the gas phase, as well as borate , formate, and methoxy species are formed in the solid phase.