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Features of Hydrolysis of Concentrated Aqueous Alkaline Solutions of NaBH4 on Co/TiO2 Catalyst

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Abstract

Kinetic experiments were carried out on the hydrolysis of concentrated aqueous and aqueous alkaline solutions of NaBH4 with a Co/TiO2 catalyst. The experiments in the aqueous NaBH4 solutions were performed at molal concentrations of 0.25, 1, and 4 mol/kg. In the aqueous alkaline solutions with molal NaBH4 concentrations of 0.25 and 1 mol/kg, the molal NaOH concentrations were varied in the range 0.05–8 mol/kg. The activation energies in the aqueous solution and the aqueous alkaline solutions were found to be 64.3 and 53.6 kJ/mol, respectively. Features of the kinetic curves and the possible kinetic schemes were discussed.

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Authors and Affiliations

  1. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 220072, Minsk, Belarus

    S. I. Shabunya, V. G. Minkina & V. I. Kalinin

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  1. S. I. Shabunya
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  2. V. G. Minkina
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  3. V. I. Kalinin
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Correspondence to V. G. Minkina.

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Translated by V. Glyanchenko

Abbreviations and notation: ξ, degree of decomposition of NaBH4; R, rate constant, mol/s/m2; Ni, number of moles of the ith component; \({{Q}_{{{\text{H}_{2}}}}}\), rate of hydrogen generation, mL/min/g catalyst; \({{\varepsilon }_{\text{empt}}}\), fraction of the free surface; \({{\varepsilon }_{i}}\), fraction of the surface that is occupied by particles of type i; \({\text{M}_{i}}\), particles of type i, initiating the desorption of adsorbed particles; Ea, activation energy, J/mol; Rg, universal gas constant, J/mol/K; and \(k\), hydration number.

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Shabunya, S.I., Minkina, V.G. & Kalinin, V.I. Features of Hydrolysis of Concentrated Aqueous Alkaline Solutions of NaBH4 on Co/TiO2 Catalyst. Kinet Catal 63, 585–592 (2022). https://doi.org/10.1134/S002315842205010X

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