Stochastic and dimensional analysis of high-pressure hydrogen adsorption via spillover on carbon supported catalyst

Puja Jain, Angela Lueking

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Carbon metal synergy in the form of hydrogen spillover can significantly increase the uptake of a carbon-based hydrogen storage material. The fundamental processes involved in hydrogen spillover are: adsorption of active hydrogen species, desorption of hydrogen species as molecular hydrogen, and surface diffusion of hydrogen species. The rates of these processes are suggested to be system dependent and it is not fully clear whether or when the hydrogen spillover process is a function of metal dispersion, metal particle size, metal loading, and metal-carbon interface. The hypothesis that hydrogen surface coverage will be determined by the competing rates of desorption vs. surface diffusion lends itself to a dimensional analysis of the spillover process. The dimensional analysis, combined with a kinetic Monte Carlo model, studied the effect of hydrogen pressure; relative activation energies of the processes involved; active metal and carbon surface area; and length of metal-support interface. These theoretically-grounded models facilitated optimization of hydrogen storage materials beyond a "trial and error" approach. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 1/04/2005).

Original languageEnglish (US)
Title of host publication05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
PublisherAmerican Institute of Chemical Engineers
Volume2005
ISBN (Print)0816909962, 9780816909964
StatePublished - 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period10/30/0511/4/05

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All Science Journal Classification (ASJC) codes

  • Energy(all)

Cite this

Jain, P., & Lueking, A. (2005). Stochastic and dimensional analysis of high-pressure hydrogen adsorption via spillover on carbon supported catalyst. In 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings (Vol. 2005). American Institute of Chemical Engineers.