催化剂对NaBH4水解放氢的影响

Effect of catalysts on hydrolysis hydrogen release of sodium borohydride

摘要:

这次工作通过排水法研究了采用混合催化剂Co₂B/ Pr₆O₁₁的硼氢化钠的水解过程。Co₂B与Pr₆O₁₁的比例和混合催化剂Co₂B/ Pr₆O₁₁的加入量对硼氢化钠放氢量的影响非常明显。当掺杂量在1-6%之间变化时,试样的放氢速率随着掺杂量先增加后减少。相比之下,混合催化剂Co₂B/ Pr₆O₁₁的加入量以及混合比例对NaBH₄的放氢量的影响并不明显。然而,NaBH₄被Co₂B / Pr₆O₁₁催化后,硼氢化钠的放氢量明显被改变了,所有的掺杂试样的放氢量在410-525ml之间。在所有试样中,掺杂4% (70%Co₂B /30%Pr₆O₁₁)的试样具有最大的放氢速率540ml/min和最大的放氢量540ml.

关键词:NaBH₄;混合催化剂;放氢量;放氢速率

Abstract:

The hydrolysis process of NaBH₄ using mixed catalyst Co₂B/Pr₆O₁₁ was studied by drainage method. The effects of the ratios of Co₂B to Pr₆O₁₁ and amount of mixed catalyst Co₂B/Pr₆O₁₁ on the amount of hydrogen release of NaBH₄ are very obvious. When the doping amount is varied between 1-6%, the hydrogen desorption rate of doped samples increasesSfirstlySandSthenSdecreases with the doping amount increases. Comparatively, the effect rule of the amount and the ratio of mixed catalyst Co₂B / Pr₆O₁₁ on the hydrogen desorption amount of NaBH₄ is not obvious. However, after NaBH₄ is being catalyzed by the mixed catalyst Co₂B / Pr₆O₁₁, the hydrogen desorption amount of the sample is obviously changed and the hydrogen desorption amounts of most samples are between 410-525ml. In all samples, the sample doped with 4% 70%Co₂B/30% Pr₆O₁₁ has the maximum hydrogen desorption rate for 540ml/min and the maximum hydrogen desorption amount for 540ml.

Key words:NaBH₄; Mixed catalyst; Amount of hydrogen release; Rate of hydrogen release