Title

Hydrogen Spillover to Enhance Hydrogen Storage -- Study of the Effect of Carbon Physicochemical Properties

Abstract

Hydrogen storage in carbon materials can be increased by hydrogen spillover from a supported catalyst; a systematic investigation of various carbon supports was used to better understand how hydrogen spillover affects hydrogen storage on carbon materials. Secondary spillover experiments effectively eliminated experimental variables associated with primary spillover, evidenced by materials clustering around the carbon type for a variety of supported catalyst-carbon mixtures. Providing a supported catalyst to act as a hydrogen source enhances the overall hydrogen uptake of a carbon material; for example, simple mixing of carbon nanotubes with supported palladium increased the uptake of the carbons by a factor of three. However, the baseline adsorption of the carbon was the predominant factor in the magnitude of the overall hydrogen uptake, even when hydrogen spillover was active. Three observations illustrated that a dynamic steady-state model is needed for predictive capacity of hydrogen spillover.

Department(s)

Chemical and Biochemical Engineering

Sponsor(s)

National Science Foundation (U.S.)

Comments

Helmut Stern and John Getsoian of Arcanum Corporation provided the ArcanumAX-21 super activated carbon. This work was funded by NSF CTS-0138190.

Keywords and Phrases

Activated carbon; Carbon nanotubes; Dissociation; Graphite fibers; Hydrogen; Mixtures; Sorption; Stoichiometry; Hydrogen spillover; Hydrogen storage; Multi-wall carbon nanotubes; Single wall carbon nanotubes; Catalyst activity; Graphite nanofibers

International Standard Serial Number (ISSN)

0926-860X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Elsevier, All rights reserved.

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