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Improved dehydrogenation of TiF3-doped NaAlH4 using ordered mesoporous SiO2 as a codopant

Published online by Cambridge University Press:  31 January 2011

Shiyou Zheng ,
Yongtao Li ,
Fang Fang ,
Guangyou Zhou ,
Xuebin Yu ,
Guorong Chen ,
Dalin Sun ,
Liuzhang Ouyang  and
Min Zhu
Shiyou Zheng
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, People's Republic of China; and Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China
Dalin Sun*
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, People's Republic of China
Min Zhu*
Affiliation:
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
*
a)Address all correspondence to this author. e-mail: dlsun@fudan.edu.cn
b)Address all correspondence to this author. e-mail: memzhu@scut.edu.cn
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Abstract

A study of the influence of mesoporous SiO2 on the dehydrogenation of NaAlH4 and TiF3-doped NaAlH4 revealed that the amount of hydrogen evolved is 3.8 wt% for the pristine NaAlH4 and around 4.2 wt% for the TiF3-doped NaAlH4, but increases to 4.9–5.0 wt% once the samples are doped with mesoporous SiO2 in the temperature range of 100–350 °C. A favorable synergistic effect on the NaAlH4 dehydrogenation is achieved as mesoporous SiO2 is added as a codopant along with TiF3, which is associated with the nanosized pores and high specific surface area of mesoporous SiO2. The catalytic mechanism of mesoporous SiO2 is more physical than chemical relative to the catalytic mechanism of TiF3.

Keywords

DopantHydrogenationStorage

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Type
Articles
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Journal of Materials Research , Volume 25 , Issue 10 , October 2010 , pp. 2047 - 2053
Copyright
Copyright © Materials Research Society 2010

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