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Catalytic hydrolysis of sodium borohydride for hydrogen production using phosphorylated silica particles

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Abstract

Hydrolysis of sodium borohydride (NaBH4) offers substantial applications in the production of hydrogen but requires an inexpensive catalyst. Herein, silica (SP) and phosphorylated silica (SP-PA) are used as a catalyst for the generation of hydrogen from NaBH4 hydrolysis. The catalyst is prepared by sol–gel route synthesis by taking tetraethyl orthosilicate as the precursor of silica whereas phosphoric acid served as the gelation and phosphorylating agent. The prepared catalyst is characterized by FT-IR spectroscopy, XRD, SEM, and EDAX. The hydrogen generation rate at SP-PA particles (762.4 mL min−1 g−1) is higher than that of silica particles (133 mL min−1 g−1 of catalyst). The higher catalytic activity of SP-PA particles might be due to the acidic functionalities that enhance the hydrogen production rate. The kinetic parameters (activation energy and pre-exponential factor) are calculated from the Arrhenius plot and the thermodynamic parameters (enthalpy, entropy, and free energy change) are evaluated using the Erying plot. The calculated activation energy for NaBHhydrolysis at SP-PA catalyst is 29.92 kJ.mol−1 suggesting the high catalytic activity of SP-PA particles. The obtained entropy of activation (ΔS‡ =  − 97.75 JK−1) suggested the Langmuir–Hinshelwood type associative mechanism for the hydrolysis of NaBHat SP-PA particles.

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Acknowledgements

The authors thank DST-FIST lab, Arul Anandar College for the instrumentation facilities.

Funding

The authors thank Arul Anandar College (Autonomous), Karumathur for providing seed money research grant 2020–21 and 2021–22.

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The authors confirm contribution to the paper as follows:

Study conception and design: K. Ganesan, D.S. Bhuvaneshwari, P. Muthukumar, M. Amalraj.

Synthesis of catalyst and experimental data collection: C. Hayagreevan and R. Rahul.

Interpretation of results: K. Ganesan, A. John Jeevagan, T. Adinaveen and M. Amalraj.

Draft manuscript preparation: D.S. Bhuvaneshwari, P. Muthukumar and M. Amalraj.

All authors reviewed the results and approved the final version of the manuscript.

Corresponding author

Correspondence to Murugan Amalraj.

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Ganesan, K., Hayagreevan, C., Rahul, R. et al. Catalytic hydrolysis of sodium borohydride for hydrogen production using phosphorylated silica particles. Environ Sci Pollut Res 30, 21199–21212 (2023). https://doi.org/10.1007/s11356-022-23672-8

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  • DOI: https://doi.org/10.1007/s11356-022-23672-8

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