复合废液的析氢利用:温和条件下赤泥催化剂上的氨硼烷水解

IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL
Mattia Bartoli, Marco Etzi, Stefania Lettieri, Giuseppe Ferraro, Candido Fabrizio Pirri, Angelica Monica Chiodoni, Sergio Bocchini
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引用次数: 0

摘要

赤泥作为氧化铝生产的主要副产物,在世界范围内产量巨大,因此赤泥的利用是一个备受关注的话题。然而,它的正确估值是一个非常复杂的问题。在这项工作中,我们提出了一种新的使用赤泥作为催化剂,在温和条件下从氨硼烷水解中释放氢。氨硼烷是最好的化学氢载体之一,其重量氢容量高达19%,但其特点是在热刺激下具有复杂的反应性。因此,氨硼烷水解已成为直接和安全的氢释放的坚实途径。在这项工作中,我们在30°C和40°C下分别在660 s和12 s后实现了氨硼烷的完全水解,赤泥负载为10 wt%。赤泥的加入使水解反应的活化能降低了90%以上,动力学常数提高了两个数量级以上。赤泥经过3次循环后仍保持了催化活性,且无明显变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Complex Waste Stream Utilization for Hydrogen Evolution: Ammonia Borane Hydrolysis Over Red Mud Catalyst Under Mild Conditions

Complex Waste Stream Utilization for Hydrogen Evolution: Ammonia Borane Hydrolysis Over Red Mud Catalyst Under Mild Conditions

The utilization of red mud is a topic of significant interest due to its great production around the world, being the major by-product of alumina production. Nevertheless, its correct valorization is a matter of great complexity. In this work, we propose a novel use of red mud as a catalyst for the release of hydrogen from hydrolysis of ammonia borane in mild conditions. Ammonia borane is among the best chemical hydrogen carriers with a gravimetric hydrogen capability of up to 19 wt% but is characterized by a complex reactivity under thermal stimuli. Accordingly, ammonia borane hydrolysis has emerged as a solid route for direct and safe hydrogen release. In this work, we achieved complete hydrolysis of ammonia borane both at 30 °C and 40 °C after 660 s and 12 s, respectively, with a red mud loading of 10 wt%. The addition of red mud decreased the activation energy of the hydrolysis reaction over 90% and increased the kinetic constant over two orders of magnitude. Furthermore, red mud preserved the catalytic activity after three cycles with no significant changes.

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来源期刊
Catalysis Letters
Catalysis Letters 化学-物理化学
CiteScore
5.70
自引率
3.60%
发文量
327
审稿时长
1 months
期刊介绍: Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.
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