In-situ synthesis of Mg2Ni-Ce6O11 catalyst for improvement of hydrogen storage in magnesium

被引：72

作者：

Liu, Pei ^{[1
]}

Lian, Jiajia ^{[1
]}

Chen, Haipeng ^{[2
]}

Liu, Xiaojing ^{[1
]}

Chen, Yuanli ^{[1
]}

Zhang, Tonghuan ^{[1
]}

Yu, Hao ^{[1
]}

Lu, Guojian ^{[3
]}

Zhou, Shixue ^{[1
]}

机构：

[1] Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofu, Coll Chem & Environm Engn, Qingdao 266590, Peoples R China

[2] Luoyang Normal Univ, Coll Chem & Chem Engn, Luoyang 471934, Peoples R China

[3] Lianyungang Normal Coll, Lianyungang 222006, Jiangsu, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2020年 / 385卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen storage; Magnesium; Synergistic catalysis; In-situ synthesis; Vacancy defect; OXYGEN-VACANCY; KINETIC-PROPERTIES; MG NANOPARTICLES; PERFORMANCE; NI; DEHYDROGENATION; DESORPTION; REDUCTION; COMPOSITE; SORPTION;

D O I：

10.1016/j.cej.2019.123448

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

To decrease the hydrogen sorption temperature and increase the hydrogen sorption rate is important for the practical application of magnesium for hydrogen storage. The binary nano-catalysts Mg2Ni and Ce6O11 with oxygen vacancy defects was in-situ synthesized on Mg surface via the hydrogen activation of Mg-Ni-CeO2. The hydrogen storage material Mg-20Ni-CeO2 can release 4.19 wt% H-2 in 5 min at 320 degrees C, which is significantly higher than that of Mg with 10 wt% Ni (3.44 wt% H-2) or 10 wt% CeO2 (0.34 wt% H-2). The peak temperature and apparent activation energy for hydrogen desorption of Mg-20Ni-CeO2 are reduced by 115.8 degrees C and 63.89 kJ/mol respectively comparing with that without catalyst. Structural analysis suggests that Mg2Ni and Ce6O11 can be in-situ synthesized on Mg surface, which shows a synergistic catalysis for hydrogen storage. During H-2 absorption, the oxygen vacancy defects on Ce6O11 surface can trap H-2 molecules, while the Mg2Ni on Mg/Mg2Ni interface can promote H-2 dissociation. For H-2 desorption, the Mg2Ni can weaken the Mg-H bond and act as "hydrogen pump" to transfer H for H-2 formation with the assistance of Ce3+/Ce4+ transformation in Ce6O11. The results of this study provide a new horizon for a novel binary catalyst design for hydrogen storage.

引用

页数：9