Kinetics of self-hydrolysis of concentrated sodium borohydride solutions at high temperatures
Kinetics of self-hydrolysis of concentrated sodium borohydride solutions at high temperatures
复制标题
高温浓硼氢化钠溶液自水解动力学
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. A. Mathews
中科院分区：
文献类型：
--
作者：
R. Retnamma;Lin Yu;C. M. Rangel;A. Novais;Karl Johnson;M. A. Mathews
硼氢化钠 (NaBH4) 溶液在金属催化剂上的水解被认为是向便携式燃料电池输送氢气的潜在技术。然而，尚未解决的问题，例如最大限度地减少水量和偏硼酸盐副产品的水合性质，限制了其储氢能力。如果可以优化操作条件，另一种方法，即蒸汽/水蒸气水解，可以在没有催化剂的情况下增强储氢能力[1]。在这种方法中，固体NaBH4吸收水并潮解，在接近水沸点时形成高度浓缩的粘性溶液，然后从浓缩的粘性溶液中析出氢气。众所周知，当 NaBH4 与水混合时，即使在室温下也会发生自水解，并且在高温下该速率变得显着。必须阻止自水解以延长溶液的保质期。
Hydrolysis of sodium borohydride (NaBH4) solution over metal catalyst is accepted as a potential technology for delivering H2 to portable fuel cells. However, unresolved issues such as minimizing the amount of water and the nature of hydration of metaborate byproducts limit its hydrogen storage capacities. An alternative method, steam/water vapor hydrolysis, can enhance the hydrogen storage capacities without catalyst, if operating conditions can be optimized [1]. In this approach, solid NaBH4 absorbs water and deliquesces, forming a highly concentrated viscous solution at near boiling point of water, followed by hydrogen evolution from the concentrated viscous solution. It is also well understood that self-hydrolysis occurs even at room temperature when NaBH4 is mixed with water and the rate becomes significant at high temperatures. Self-hydrolysis must be arrested to increase the shelf-life of the solution.