偏硼酸钠非催化固体水解硼氢化钠的研究

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Geo Jong Kim, Savannah G. Hunt, Allison Millspaugh, Byeong Uk Kim, Sang Bum Kim, Hyun Tae Hwang
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引用次数: 0

摘要

由于化石燃料的迅速消耗和使用造成的污染,寻找替代燃料变得越来越重要。氢被认为是最好的竞争者之一,因为它的副产品是水。然而,必须开发安全的方法来储存氢,以利用氢作为有效的能量载体或来源。硼氢化钠(NaBH4, SBH)作为一种储氢材料因其含氢量高、材料成本低而备受关注。氢可以通过SBH的热裂解或水解产生。不幸的是,热分解需要极高的温度(> 300℃),而水解需要大量的水,因为SBH和乏燃料在水中的溶解度很低。此外,当SBH与水一起存在时,由于氢气的自发生成,它可能会导致安全和储存问题。在我们之前的工作中,已经证明SBH的固态水解提高了安全性和高产氢率。尽管取得了这些有利的结果,但分离产品以再生乏燃料以降低总体成本仍然具有挑战性。在这里,我们提出了SBH和四水偏硼酸钠(NaBO2 4H2O, SMB4H)热脱水形成的水的水解。由于SBH和SMB4H的混合物在环境条件下是稳定的,因此消除了SBH自水解带来的安全风险。此外,由于最终产物与SBH水解产物偏硼酸钠(NaBO4·xH2O, SMB)均质,因此有望在再生乏燃料时节省分离成本。使用这种方法,在200°C和250°C的条件下,H2产率分别达到4.7%和5.1wt%。该方法具有产氢率高、安全性好、可降低再生过程中分离过程成本的优点,是燃料电池储氢的理想方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Noncatalytic Solid-State Hydrolysis of Sodium Borohydride with Sodium Metaborate Hydrate

Due to the rapid depletion of fossil fuels and pollution from their use, finding an alternative fuel is becoming increasingly important. Hydrogen is considered one of the best contenders, as its by-product is water. However, safe methods to store hydrogen must be developed to use hydrogen as an effective energy carrier or source. Sodium borohydride (NaBH4, SBH) has been attracting great attention as a hydrogen storage material because of its relatively high hydrogen content and low material cost. Hydrogen can be produced through thermolysis or hydrolysis of SBH. Unfortunately, thermolysis requires extremely high temperatures (> 300 °C), while hydrolysis needs an excessive amount of water because the solubilities of SBH and the spent fuel in water are low. In addition, when SBH is present with water, it can cause problems in safety and storage due to the spontaneous generation of hydrogen. In our prior work, it has been demonstrated that solid-state hydrolysis of SBH offers improved safety and high hydrogen yield. Despite these favorable outcomes, separating the products to regenerate spent fuel to lower the overall cost remains challenging. Here, we proposed the hydrolysis of SBH and water formed by thermal dehydration of sodium metaborate tetrahydrate (NaBO2 4H2O, SMB4H). Since the mixture of SBH and SMB4H is stable at ambient conditions, the safety risk due to self-hydrolysis of SBH is eliminated. Additionally, since the final products are homogeneous with sodium metaborate (NaBO4·xH2O, SMB), a product of the hydrolysis of SBH, it is expected that separation cost can be saved when regenerating the spent fuel. Using this approach, maximum overall H2 yields of 4.7 and 5.1wt% were obtained at 200 and 250 °C, respectively. With high hydrogen yield and safety and potential reduction in separating process costs during regeneration, this proposed method is promising for hydrogen storage for fuel cell applications.

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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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