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Synchronous Growth of Porous MgO and Half-Embedded Nano-Ru on a Mg Plate: A Monolithic Catalyst for Fast Hydrogen Production
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2021-02-25 , DOI: 10.1021/acssuschemeng.1c00072
Xiaoqing Cao 1 , Jun Zhou 1 , Zhipeng Zhai 1 , Song Li 1 , Guo Yuan 2 , Gaowu Qin 1, 3
Affiliation  

Development of efficient and sustainable monolithic catalysts for NaBH4 hydrolysis remains an important goal for hydrogen cycling. In this work, the structured catalyst Ru/MgO with an on–off feature has been prepared by directly growing a nano-Ru-embedded MgO coating layer on a Mg substrate via an instant high-temperature plasma oxidation process. The porous MgO framework provides an ideal space for the access of reactants and diffusion of mass transport, which facilitates reaction triggering and the expulsion of byproducts to avoid poisoning the catalyst. Importantly, Ru nanoparticles (NPs) are monodisperse with ultrasmall particle size deriving from a concurrent rapid arcing and fast quenching. The hierarchical structured Ru NP catalysts are highly active for hydrolysis of sodium borohydride by achieving a high hydrogen generation rate (HGR) of 101,189 mL min–1 g–1 and exhibit attractive stability. In addition, it is facile to realize the “on–off” functionality based on simple separation that could accurately control the hydrogen generation, suggesting the structured catalyst to be of great potential for practical applications. This simple method opens valuable opportunities for fast synthesis of the high-quality structured catalyst and could be extended to various noble metals on oxides of valve metals with high catalytic performance.

中文翻译:

镁板上多孔MgO和半嵌入式纳米Ru的同步生长:快速制氢的整体催化剂

开发高效,可持续的NaBH 4整体催化剂水解仍然是氢循环的重要目标。在这项工作中,具有开-关功能的结构化催化剂Ru / MgO是通过即时高温等离子体氧化工艺在Mg基底上直接生长纳米Ru嵌入的MgO涂层而制备的。多孔的MgO骨架为反应物的进入和质量传递的扩散提供了理想的空间,这有利于反应的触发和副产物的排出,避免中毒催化剂。重要的是,Ru纳米颗粒(NPs)是单分散的,具有超小粒径,这是由同时进行的快速电弧放电和快速淬火得到的。分级结构的Ru NP催化剂通过达到101,189 mL min –1 g –1的高氢生成速率(HGR),对硼氢化钠的水解具有高活性并表现出有吸引力的稳定性。另外,容易实现基于简单分离的“开-关”功能,该功能可以精确控制氢气的产生,这表明结构化催化剂在实际应用中具有巨大潜力。这种简单的方法为快速合成高质量结构化催化剂提供了宝贵的机会,并且可以扩展到具有高催化性能的阀金属氧化物上的各种贵金属。
更新日期:2021-03-08
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