Conclusion

The equilibrium adsorption isotherm and breakthrough data were used to assess the feasibility of developing a granular activated carbon (GAC) adsorber for use as a sulfur removal subsystem in transportation fuel cell systems. Results of this analysis suggest that an on-board GAC adsorber may not be attractive due to its size and weight constraints. However, it may be feasible to install this GAC adsorber at methanol distribution stations, where space and weight are not a critical concern. A preliminary economic analysis indicated that the GAC adsorber concept will be attractive if the spent AC can be regenerated for reuse. It should be emphasized here that these preliminary analyses were made on the basis of the very limited breakthrough data obtained from the bench-scale testing. More detailed optimization on the dynamic testing parameters and the study on regeneration of the spent AC are needed.

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