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Reactant Feeding Strategy Analysis of Sodium Borohydride Hydrolysis Reaction Systems for Instantaneous Hydrogen Generation.
- Source :
- Energies (19961073); Sep2020, Vol. 13 Issue 18, p4674, 1p
- Publication Year :
- 2020
-
Abstract
- In this study, the operational procedure of an experiment and simulation for a hydrogen-on-demand system using sodium borohydride hydrolysis is proposed. For an isothermal operating condition of a packed-bed reactor, the dynamic response between the input NaBH<subscript>4</subscript> feed (F<subscript>NaBH</subscript><subscript>4,0(S)</subscript>) and the output hydrogen flowrate (F<subscript>H</subscript><subscript>2(S)</subscript>) of the reactor can be analytically derived and is a first-order transfer function. The time constant of this transfer function is a function of the reciprocal of the product of the reaction rate constant and the catalyst weight into the liquid volume of the reactor. The kinetic parameters of Co-B/IR-200 catalysts are regressed from the experimental NaBH<subscript>4</subscript> hydrolysis reaction. The result shows a 30 °C operating temperature increase (from 40 °C till 70 °C) can shorten the dynamic response time of the hydrogen generation rate by around two-thirds. From theoretical derivation, a feeding strategy which supplies the combination of impulse function and step function of the NaBH<subscript>4</subscript> feed flowrate can produce a hydrogen-on-demand system. However, for real applications, a combined pulse and step function of the NaBH<subscript>4</subscript> feed flowrate is used due to limitations in pump capacity. Hence, a systematic feeding procedure can then be constructed to achieve the US Department of Energy's fuel cell start-up time target of less than 5 s. to produce hydrogen. Finally, the experiment was set-up to validate the simulation result. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961073
- Volume :
- 13
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Energies (19961073)
- Publication Type :
- Academic Journal
- Accession number :
- 146714117
- Full Text :
- https://doi.org/10.3390/en13184674