Influence of vacant CeO2 nanostructured ceramics on MgH2 hydrogen desorption properties

被引：43
作者：
Gulicovski, Jelena [1 ]
Raskovic-Lovre, Zeljka [1 ]
Kurko, Sandra [1 ]
Vujasin, Radojka [1 ]
Jovanovic, Zoran [1 ]
Matovic, Ljiljana [1 ]
Novakovic, Jasmina Grbovic [1 ]
机构：
[1] Univ Belgrade, Vinca Inst Nucl Sci, Mat Sci Lab, Belgrade 11000, Serbia
来源：
CERAMICS INTERNATIONAL | 2012年 / 38卷 / 02期
关键词：
Milling; Nanocomposites; CeO2; Desorption properties; Hydrogen storage; SORPTION KINETICS; STORAGE PROPERTIES; METAL-OXIDES; MAGNESIUM; CERIA; IMPROVEMENT; ABSORPTION; CATALYSTS;
D O I：
10.1016/j.ceramint.2011.08.047
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The hydrogen desorption (HD) properties of MgH2-CeO2 composite prepared by mechanically milling of MgH2 and cubic CeO2nano have been examined. Morphology and microstructure of composites have been studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), laser scattering analysis and correlated with desorption properties obtained by means of temperature programmed desorption (TPD). It has been shown that decrease of crystallite and particle size of the samples lead to significant lowering of desorption temperature. Further, the activation energy for desorption (E-A(des)) has been calculated using Kissinger equation. Obtained value of 60 +/- 10 kJ/mol indicates that the activation energy of hydrogen desorption is sufficiently decreased by the catalytic effect of vacant CeO2 structure. Consequently the surface activation of sample plays a major role in HD reaction. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：1181 / 1186
页数：6
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