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Research Papers

Dynamic Response of a High Pressure Hydrogen Generator

[+] Author and Article Information
Joshua C. Walter1

Multi-phase and Fuel Cell Research Laboratory, Purdue University School of Nuclear Engineering, 400 Central Drive, West Lafayette, IN 47907jcwalter@purdue.edu

Brian J. Wolf, Shripad T. Revankar

Multi-phase and Fuel Cell Research Laboratory, Purdue University School of Nuclear Engineering, 400 Central Drive, West Lafayette, IN 47907

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(4), 041015 (Apr 01, 2011) (4 pages) doi:10.1115/1.3006311 History: Received June 17, 2007; Revised December 21, 2007; Published April 01, 2011; Online April 01, 2011

Hydrogen generation from catalyzed solutions of sodium borohydride has been demonstrated experimentally up to 10 MPa. Sodium borohydride solutions are nonflammable, stable in basic solution, and offer a volumetric hydrogen density of 63.2gH2/l. In the presented work, the reaction rate data for catalyzed hydrolysis of sodium borohydride solutions as a function of hydrogen static pressure are coupled with a polymer electrolyte membrane fuel cells model. It has been shown that the elevated hydrogen pressure can bring the solution to equilibrium and tends to return to equilibrium upon pressure decrease. The model considers hydrogen demand from a fuel cell and the response of the high pressure hydrogen generator in terms of a mass balance. It is shown that 2–4 g of Co3B is adequate to hydrolyze 60 l of 30wt%NaBH4 solution.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

XRD spectra for cobalt boride samples heat treated at 300°C and 400°C showing the development of a crystalline phase corresponding to Co3B

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Figure 2

Experimental test vessel for high pressure hydrolysis reactions

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Figure 3

Use of Ru catalyst to demonstrate response of 5 wt %NaBH4 and 5 wt % NaOH solution at 60°C to change in hydrogen product pressure

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Figure 4

Rate of pressure change as a function of hydrogen product pressure using 5 wt %NaBH4 and 5 wt % NaOH in 180 g H2O catalyzed by 0.12 g CoB catalyst

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Figure 5

Variation of hydrolysis rate with increasing NaBH4 concentration at 60°C with 5 wt % NaOH

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Figure 6

Starting response of the hydrogen generator to 30 kW and 50 kW fuel cell demands at 20°C with a catalyst loading of 2 g Co3B

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Figure 7

Starting response of the hydrogen generator to a 55 kW continuous fuel cell demand at various hydrogen generator temperatures with a catalyst loading of 2 g Co3B

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Figure 8

Starting response of the hydrogen generator to 55 kW continuous cycling for 18 s periods with 2 g and 4 g of Co3B catalyst

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