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. For the reaction of alkali borohydride with CO 2 , hydrogen and trimethylborane are formed in the gas phase, as well as borate, formate, and methoxy species are formed in the solid phase. Image 1 • The solid-gas reaction of alkali borohydride with CO 2 was investigated. • The reaction is carried out at ambient temperature under mechanochemical condition. • The hydrogen and trimethylborane are formed in the gas phase. • The borate, formate, and methoxy species are formed in the solid phase. • The work provides a new method for converting CO 2 using borohydrides. [ABSTRACT FROM AUTHOR]