Storage of reactive hydrogen species in CeMxOy (M = Cu, Ni; 0 ≤ x ≤ 1) mixed oxides

被引:27
作者
Jalowiecki-Duhamel, L [1 ]
Ponchel, A [1 ]
Lamonier, C [1 ]
机构
[1] Univ Sci & Tech Lille Flandres Artois, Catalyse Heterogene & Homogene Lab, CNRS, URA D04020, F-59655 Villeneuve Dascq, France
关键词
D O I
10.1016/S0360-3199(98)00143-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Interaction of hydrogen with a series of mixed oxides CeMxOy (M = Cu, Ni; 0 less than or equal to x less than or equal to 1) has been studied in the 300-1073 K temperature range. A dynamic method of titration has been used to provide evidence for reactive hydrogen H* present in the solids. This method of titration involves hydrogenation at 423 K of isoprene under helium flow in the absence of gaseous hydrogen. The hydrogen reservoir capacity depends on the pretreatment temperature under H-2 and is related to the creation of anionic vacancies in the solid. All the CeMxOy mixed oxides are large catalytic hydrogen reservoirs with marked diffusion properties of hydrogen species (H*, OH-). In the series studied, the highest amount of hydrogen H* (29.5 10(-3) mol g(-1)) is stored by CeNi0.7Oy pretreated under H-2 at 523 K (H6.8CeNi0.7Oy). In the conditions in which the incorporation of hydrogen in the solid occurs, X-ray diffraction analysis under H-2 shows shifts depending on the treatment temperature and corresponding to non-negligeable expansion of the ceria-based lattice attributed to the insertion of hydrogen species of hydridic nature in the anionic vacancies. (C) 1999 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.
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收藏
页码:1083 / 1092
页数:10
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