Aluminum chloride for accelerating hydrogen generation from sodium borohydride
Aluminum chloride for accelerating hydrogen generation from sodium borohydride
复制标题
DOI：
10.1016/j.jpowsour.2009.03.015
复制
发表时间：
2009-07
影响因子：
9.2
通讯作者：
U. Demirci;O. Akdim;P. Miele
中科院分区：
文献类型：
--
作者：
U. Demirci;O. Akdim;P. Miele
本文报道了利用无水氯化铝（AlCl3）在80°C下加速硼氢化钠（NaBH 4）水溶液水解制氢的初步结果。据我们所知，AlCl3从未被考虑用于该反应，尽管已经评估了许多过渡金属盐。将AlCl3的反应性与AlCl3·6H2O、AlF3、CoCl2、RuCl3和NiCl2的反应性进行比较。用AlCl 3和重量储氢容量（GHSC）为2.9wt.%的NaBH 4溶液，在几秒钟内产生几乎100%的氢气，即，氢生成速率（HGR）为354Lmin−1g−1（Al）。这是有史以来报告的最高比率之一。通过将AlCl3与CoCl2、RuCl3或NiCl2混合获得更高的HGR。例如，RuCl 3：AlCl 3（50：50质量比）系统显示HGR> 1000 Lmin −1g−1（Ru：Al）。水解副产物（干燥后）经XRD、IR和元素分析鉴定为Al（OH）3、NaCl和Na2B（OH）4Cl，并且观察到即使原位形成的Al（OH）3也具有催化能力，HGR为5Lmin−1g−1（Al）。初步结果表明，AlCl3具有作为一次性NaBH4基存储体系促进剂的潜力。
The present research paper reports preliminary results about the utilization of anhydrous aluminum chloride (AlCl3) for accelerating hydrogen generation through hydrolysis of aqueous solution of sodium borohydride (NaBH4) at 80°C. To the best of our knowledge, AlCl3has never been considered for that reaction although many transition metal salts had already been assessed. AlCl3reactivity was compared to those of AlCl3·6H2O, AlF3, CoCl2, RuCl3and NiCl2. With AlCl3and a NaBH4solution having a gravimetric hydrogen storage capacity (GHSC) of 2.9wt.%, almost 100% hydrogen was generated in few seconds, i.e., with a hydrogen generation rate (HGR) of 354Lmin−1g−1(Al). This HGR is one of the highest rates ever reported. Higher HGRs were obtained by mixing AlCl3with CoCl2, RuCl3or NiCl2. For example, the system RuCl3:AlCl3(50:50 mass proportion) showed a HGR>1000Lmin−1g−1(Ru:Al). The hydrolysis by-products (once dried) were identified (by XRD, IR and elemental analysis) as being Al(OH)3, NaCl and Na2B(OH)4Cl and it was observed that even in situ formed Al(OH)3has catalytic abilities with HGRs of 5Lmin−1g−1(Al). All of these preliminary results are discussed, which concludes that AlCl3has a potential as accelerator for single-use NaBH4-based storage system.