The interaction of alkaline solutions of potassium borohydride with LaNi4.5M0.5 (M = Ni,Mn, Cr,Co, Fe,Cu, Al) intermetallic compounds

The behavior of LaNi_4.5M_0.5 (M = Ni, Mn, Cc Co, Fe, Cu, Al) interinctallic compounds (IMC) in alkaline solutions of KBH₄ (0.1; 1.0; 4.0 mol L^–1 KOH) Was investigated in the temperature range 298–318 K. The catalytic hydrolysis of KBH₄ is zero order with respect to KBH₄ and not order with respect to IMC. Activation energies of the catalytic hydrolysis of KBH₄ in the presence of' IMC are in the range of 60–65 U mol^–1. The rate of hydrolysis of KBH₄ increases with the concentration of the KOH solution. The hydrogenation of LaNi_4.5M_0.5 in alkaline solutions of KBH₄ yields -hybride phases for M = Min, Cr, Co, Cu, Al and -hybride phases for M = Ni, Fe.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1632–1635, July, 1996.