Revision of the NaBO2–H2O phase diagram for optimized yield in the H2 generation through NaBH4 hydrolysis

Abstract : The binary phase diagram NaBO 2-H 2 O at ambient pressure, which defines the different phase equilibria that could be formed between borates, end-products of NaBH 4 hydrolysis, has been reviewed. Five different solid borates phases have been identified: NaBO 2 ·4H 2 O (Na[B(OH) 4 ]·2H 2 O), NaBO 2 ·2H 2 O (Na[B(OH) 4 ]), NaBO 2 ·2/3H 2 O (Na 3 [B 3 O 4 (OH) 4 ]), NaBO 2 ·1/3H 2 O (Na 3 [B 3 O 5 (OH) 2 ]) and NaBO 2 (Na 3 [B 3 O 6 ]), and their thermal stabilities have been studied. The boundaries of the different Liquid+Solid equilibria for the temperature range from-10 to 80 °C have been determined, confirming literature data at low temperature (20 °C ~ 50 °C). Moreover the following eutectic transformation, Liq. → Ice + NaBO 2 ·4H 2 O, occurring at-7 °C, has been determined by DSC. The Liquid-Vapour domain has been studied by ebullioscopy. The invariant transformation Liq. → Vap. + NaBO 2 ·2/3H 2 O has been estimated at 131.6 °C. This knowledge is paramount in the field of hydrogen storage through NaBH 4 hydrolysis, in which borate compounds were obtained as hydrolysis reaction products. As a consequence, the authors propose a comparison with previous NaBO 2-H 2 O binary phase diagrams and its consequence related to hydrogen storage through NaBH 4 hydrolysis.
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International Journal of Hydrogen Energy, Elsevier, 2012, 37 (7), pp.5798 - 5810. 〈10.1016/j.ijhydene.2011.12.106〉
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Jérôme Andrieux, Laetitia Laversenne, Olesia Krol, Rodica Chiriac, Zeinab Bouajila, et al.. Revision of the NaBO2–H2O phase diagram for optimized yield in the H2 generation through NaBH4 hydrolysis. International Journal of Hydrogen Energy, Elsevier, 2012, 37 (7), pp.5798 - 5810. 〈10.1016/j.ijhydene.2011.12.106〉. 〈hal-01612021〉

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