Effect of catalysts on dehydrogenation of LiAlH4+MgH2 composite and catalytic mechanism

Xiang Qian Ding; Yun Feng Zhu; Ling Jun Wei; Qing Qing Huan; Li Quan Li

Effect of catalysts on dehydrogenation of LiAlH₄+MgH₂ composite and catalytic mechanism

Xiang Qian Ding, Yun Feng Zhu, Ling Jun Wei, Qing Qing Huan, Li Quan Li

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The LiAlH₄+MgH₂ composites doped with different catalysts were prepared by mechanical milling to improve the hydrogen desorption properties. Structural and dehydrogenation properties of the composites were investigated by XRD, SEM, EDS, XPS and Sieverts method. The catalytic mechanism of TiF₃ was also discussed. The results show that doping with TiF₃ decreases effectively the onset hydrogen desorption temperature, and increases the dehydrogenation kinetics of the composite. The TiF₃-doped system exhibits the onset hydrogen desorption temperature of 84.1°C and hydrogen desorption capacity (mass fraction) of 8.0%. The unknown Ti^x+-containing compound forms during thermal desorption of the composite, which promotes effectively the synergetic dehydrogenation of LiAlH₄ and MgH₂. In addition, the dehydrogenation activation energy E_a of the composite doped with TiF₃ is calculated by JMA equation to be 79.1 kJ/mol, which is much lower than that of the composite without TiF₃ addition (91.3 kJ/mol), indicating that TiF₃ addition decreases greatly the kinetic barrier for dehydrogenation.

Original language	English
Pages (from-to)	1356-1361
Number of pages	6
Journal	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume	23
Issue number	5
State	Published - May 2013

Keywords

Catalytic mechanism
LiAlH
MgH
TiF

Cite this

@article{57f176759c1d42069483340ae56a4b00,

title = "Effect of catalysts on dehydrogenation of LiAlH4+MgH2 composite and catalytic mechanism",

abstract = "The LiAlH4+MgH2 composites doped with different catalysts were prepared by mechanical milling to improve the hydrogen desorption properties. Structural and dehydrogenation properties of the composites were investigated by XRD, SEM, EDS, XPS and Sieverts method. The catalytic mechanism of TiF3 was also discussed. The results show that doping with TiF3 decreases effectively the onset hydrogen desorption temperature, and increases the dehydrogenation kinetics of the composite. The TiF3-doped system exhibits the onset hydrogen desorption temperature of 84.1°C and hydrogen desorption capacity (mass fraction) of 8.0%. The unknown Tix+-containing compound forms during thermal desorption of the composite, which promotes effectively the synergetic dehydrogenation of LiAlH4 and MgH2. In addition, the dehydrogenation activation energy Ea of the composite doped with TiF3 is calculated by JMA equation to be 79.1 kJ/mol, which is much lower than that of the composite without TiF3 addition (91.3 kJ/mol), indicating that TiF3 addition decreases greatly the kinetic barrier for dehydrogenation.",

keywords = "Catalytic mechanism, LiAlH, MgH, TiF",

author = "Ding, {Xiang Qian} and Zhu, {Yun Feng} and Wei, {Ling Jun} and Huan, {Qing Qing} and Li, {Li Quan}",

year = "2013",

month = may,

language = "英语",

volume = "23",

pages = "1356--1361",

journal = "Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals",

issn = "1004-0609",

publisher = "Central South University of Technology",

number = "5",

}

TY - JOUR

T1 - Effect of catalysts on dehydrogenation of LiAlH4+MgH2 composite and catalytic mechanism

AU - Ding, Xiang Qian

AU - Zhu, Yun Feng

AU - Wei, Ling Jun

AU - Huan, Qing Qing

AU - Li, Li Quan

PY - 2013/5

Y1 - 2013/5

N2 - The LiAlH4+MgH2 composites doped with different catalysts were prepared by mechanical milling to improve the hydrogen desorption properties. Structural and dehydrogenation properties of the composites were investigated by XRD, SEM, EDS, XPS and Sieverts method. The catalytic mechanism of TiF3 was also discussed. The results show that doping with TiF3 decreases effectively the onset hydrogen desorption temperature, and increases the dehydrogenation kinetics of the composite. The TiF3-doped system exhibits the onset hydrogen desorption temperature of 84.1°C and hydrogen desorption capacity (mass fraction) of 8.0%. The unknown Tix+-containing compound forms during thermal desorption of the composite, which promotes effectively the synergetic dehydrogenation of LiAlH4 and MgH2. In addition, the dehydrogenation activation energy Ea of the composite doped with TiF3 is calculated by JMA equation to be 79.1 kJ/mol, which is much lower than that of the composite without TiF3 addition (91.3 kJ/mol), indicating that TiF3 addition decreases greatly the kinetic barrier for dehydrogenation.

AB - The LiAlH4+MgH2 composites doped with different catalysts were prepared by mechanical milling to improve the hydrogen desorption properties. Structural and dehydrogenation properties of the composites were investigated by XRD, SEM, EDS, XPS and Sieverts method. The catalytic mechanism of TiF3 was also discussed. The results show that doping with TiF3 decreases effectively the onset hydrogen desorption temperature, and increases the dehydrogenation kinetics of the composite. The TiF3-doped system exhibits the onset hydrogen desorption temperature of 84.1°C and hydrogen desorption capacity (mass fraction) of 8.0%. The unknown Tix+-containing compound forms during thermal desorption of the composite, which promotes effectively the synergetic dehydrogenation of LiAlH4 and MgH2. In addition, the dehydrogenation activation energy Ea of the composite doped with TiF3 is calculated by JMA equation to be 79.1 kJ/mol, which is much lower than that of the composite without TiF3 addition (91.3 kJ/mol), indicating that TiF3 addition decreases greatly the kinetic barrier for dehydrogenation.

KW - Catalytic mechanism

KW - LiAlH

KW - MgH

KW - TiF

UR - http://www.scopus.com/inward/record.url?scp=84880385260&partnerID=8YFLogxK

M3 - 文章

AN - SCOPUS:84880385260

SN - 1004-0609

VL - 23

SP - 1356

EP - 1361

JO - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

JF - Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals

IS - 5

ER -

Effect of catalysts on dehydrogenation of LiAlH₄+MgH₂ composite and catalytic mechanism

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Keywords

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