Dehydrogenation Property and Mechanism of 3LiBH4/CeF3System

doi:10.7503/cjcu20150848

Abstract

Abstract:

The 3LiBH₄/CeF₃ reactive system was prepared by ball-milling treatment. Its dehydrogenation property and reaction as well as the property improvement mechanism were investigated by pressure-composition-temperature(PCT) analyser, X-ray diffractometer(XRD) and Fourier transform infrared spectrometer(FTIR). It was found that the 3LiBH₄/CeF₃ system fast released hydrogen at about 295 ℃ with about 4.1%(mass fraction) of hydrogen totally desorbed. During the dehydrogenation process, CeF₃ reacted directly with LiBH₄ according to the reaction 3LiBH₄+CeF₃ 1/2CeB₆+1/2CeH₂+3LiF+11/2H₂. In comparison with pristine LiBH₄, the decrease in dehydrogenation thermodynamic stability and apparent activation energy are the main reasons for the declined dehydrogenation temperature of the 3LiBH₄/CeF₃ system.

Key words: LiBH₄, CeF₃, Dehydrogenation property, Dehydrogenation mechanism

CLC Number:

O643

TrendMD:

GU Run, ZHANG Ming, WANG Chunyang, HUANG Weijun, LIU Dongming. Dehydrogenation Property and Mechanism of 3LiBH4/CeF3System[J]. Chem. J. Chinese Universities, 2016, 37(4): 688.

Figures/Tables 7

Fig.1 Hydrogen desorption curves of the 3LiBH4/CeF3 system ball-milled for different time

Fig.2 XRD patterns of the 3LiBH4/CeF3(BM-2 h) system dehydrogenated at 250(a), 350(b) and 450 ℃(c), respectively

Fig.3 FTIR spectra of the 3LiBH4/CeF3(BM-2 h) system before(a) and after(b—f) heating at different temperaturesHeating temperature/℃: b. 250; c. 300; d. 350; e. 400; f. 450.

Fig.4 Dehydrogenation p-c isotherm of the 3LiBH4/CeF3 system at 290 ℃

Fig.5 Isothermal dehydrogenation curves of the 3LiBH4/CeF3 system at different temperatures

Fig.6 Plots of [-ln(1-α)]1/2 vs. t for the 3LiBH4/CeF3 system dehydrogenated at different temperatures

Fig.7 Arrhenius curve for the dehydrogenation of the 3LiBH4/CeF3 system

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