Hydrogen production from solid reactions between MAlH4 and NH4Cl |
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| Authors: | Huajun Zhang Yook Si Loo Hans Geerlings Jianyi Lin Wee Shong Chin |
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| Affiliation: | 1. Institute of Chemical & Engineering Science, A-star, 1 Pesek Road, Jurong Island, Singapore 627833;2. Shell Global Solutions International BV, P.O. Box 38000, 1030 BN Amsterdam, The Netherlands;3. Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;4. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543 |
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| Abstract: | Solid reactions between alkali aluminum hydrides (MAlH4, M = Li or Na) and NH4Cl (at mole ratio 1:1) at 170 °C were investigated quantitatively using temperature programmed reaction (TPR), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and x-ray diffraction (XRD). The release of 3 mol of H2 from per mole of MAlH4 was measured, corresponding to 5.6 wt.% H2 capacity for the NaAlH4/NH4Cl system and 6.6 wt.% for LiAlH4/NH4Cl, respectively. By ball milling of the precursor compounds prior to the mixing, the reaction proceeded fast and NH3 production as the by-product could be avoided. The quick solid reactions may be attributed to the low melting temperatures of MAlH4 and the exothermic nature of the reactions. The reaction mechanism was also discussed. |
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| Keywords: | Hydrogen production Hydrogen storage Chemical hydrogen storage Solid state reaction Alkali aluminum hydride |
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